GB2638400A

GB2638400A - Modular building assembly

Info

Publication number: GB2638400A
Application number: GB2402370.7A
Authority: GB
Inventors: Ross Shenton Edward; Lee Jones David
Original assignee: Sano Development Ltd
Current assignee: Sano Development Ltd
Priority date: 2024-02-20
Filing date: 2024-02-20
Publication date: 2025-08-27

Abstract

There is disclosed a modular building assembly configured to form at least part of a building (10), a building system and a building comprising the modular building assembly, and a method of constructing a building using the modular building assembly. One exemplary modular building assembly (12) comprises a first modular building unit (14) comprising an internal volume (16), the first modular building unit having a footprint (18), and at least one further modular building unit (20). The further modular building unit comprises: a room section (21) defining an internal volume (22) configured to form at least part of at least one room of the building; and a floor section (26) extending laterally from the room section. Said further modular building unit is configured to be positioned on top of the first modular building unit so that the room section overlies a first portion (24) of the footprint of the first modular building unit, and so that the floor section overlies a further portion (27) of the footprint.

Description

MODULAR BUILDING ASSEMBLY

The present invention relates to a modular building assembly configured to form at least part of a building, the modular building assembly comprising a first modular building unit, and at least one further modular building unit configured to be positioned on top of the first modular building unit.. The present invention also relates Lo a building system comprising the modular building assembly, a building comprising the modular building assembly, and a method of constnating a building using the modular building assembly.

Prefabricated buildings (also known as 'modular buildings) are well known in the construction industry, particularly modular residential buildings such as houses, flats or apartments, and hotels. Modular buildings typically comprise a series of building units which are constructed in a factory, transported to a final location (or site) for the building, and then arranged in a predetermined configuration and coupled together to form the finished building. The modular building units are typically constructed to a substantially assembled form in the factory, in which they can be transported to the final location.

Construction of the building can involve forming a modular building assembly comprising a first (or lower) modular building unit, and a further (or upper) modular building unit stacked on the first unit. Typically, the first modular building unit has a footprint, and the further modular building unit has a footprint which corresponds to that of the first unit. The second modular building unit is positioned on top of the first modular building unit so that it overlies substantially the entire footprint of the first unit. Whist the modular building assembly may form substantially the entire building, it is common to connect one or more further modular building unit to the assembly to form the completed building. Optionally, the modular building assembly fonns a first such assembly of the building, and one or more further modular building assembly is provided which, in conjunction with the first modular building assembly, forms the completed building.

Hybrid buildings have been developed by the applicant which comprise a first building section that is constructed at a final location for the building, and a second building section comprising one or more modular building unit constructed in a dedicated facility, away from the linal location. The hybrid buildings and associated construction techniques are disclosed in International patent publication nos. W02022/243696, W02022/243695, W02022/243694, W02022/243693 and W02023/222853. The hybrid buildings can comprise two or more storeys, and so can include one or more modular building assembly of the type described above, having slacked first and second modular building units.

The applicant has recognised that it can be desirable, in certain building constructions, to limn a modular building assembly comprising first and second modular building units having different footprints, and/or by arranging the second modular building unit so that it only overlies a part of the footprint of the first modular building unit. This can however present certain challenges when it comes to completing a building comprising the modular building assembly.

According to a first aspect, there is provided a modular building assembly configured to form at least part of a building, the modular building assembly comprising: a first modular building unit comprising an internal volume, the first modular building unit having a footprint; aL least one further modular building unit comprising: a room section defining an internal volume configured to form at least part of at least one room of the building; and a floor section extending laterally from the room section; in which said finther modular building unit is configured to be positioned on top of the first modular building unit so that the room section overlies a first portion of the footprint of the first modular building unit, and so that the floor section overlies a further portion of the footprint.

In the modular building assembly of the first aspect, the room section of the further modular building unit overlies only the first portion of the first modular building unit footprint, whilst the floor section overlies the further portion of the footprint. This may provide greater design freedom for an upper storey of a building comprising the modular building assembly, the upper storey including, and/or being formed at least partly by, the further modular building unit. for example; living space provided in the upper storey of a building comprising the modular building assembly, and/or access into such living space, may be less restricted by the shape and/or size of a support structure (e.g. a structural frame) of the further modular building unit. Previously, the living space/access had to fit around the structural frame, particularly upright support posts of the frame.

The greater design freedom may he provided particularly in a hybrid building comprising the modular building assembly; which will be discussed in more detail below.

The reference to a footprint of the first modular building unit should generally be understood to mean the area (on, in or above the ground) which the unit accommodates, measured from outer surfaces or boundaries of Lhe unit.

Reference is made to the room section and the floor section overlying portions of the first modular building unit footprint. It will be understood that said sections may overlie the respective portions of the footprint in that they may substantially (or completely) cover said portions of the footprint, when viewed from above or in plan. The footprint portions may each have a respective perimeter, and Lhe room section and the floor section may extend at least up to the respective perimeter, in order to overlie said footprint portions.

Reference is made to said further modular building unit being positioned on top of Lhe first modular building unit. This may effectively require that said further modular building unit be positioned above, and supported by or on the first modular building unit. Typically it will he in direct contact with the first modular building unit, and so positioned directly on the first unit. however, it may be in indirect contact with the first modular building unit and so positioned indirectly on the first unit (i.e. not in direct contact, and so for example with an intermediate component, such as a support structure, between them).

The first modular building unit may provide or define at least part of an access route or pathway, which may provide for access From the first modular building unit Lo at least one of a) a floor supported or defined by the floor section; and b) the internal volume of the room section.

The first modular building unit may comprise at least a main part of a staircase, which may limn said part of the access route. The first modular building unit may comprise a ceiling structure. The first modular building unit and the floor section may be arranged so that all aperture is provided in and/or extending through the ceiling structure (when said further modular building omit is positioned on the first modular building unit). The aperture may conummicate with the main part of the staircase. The floor section may comprise an aperture, which may communicate with the main part of the staircase in the first modular building unit when the further modular building unit is positioned on top of the first modular building unit. The room section may comprise an aperture, which may conummicate with the main part of the staircase in the first modular building unit when the further modular building unit is positioned on top of the first modular building unit.

Reference is made to the floor section extending laterally from the room section. It will be understood that this is during normal use of the modular building assembly, and so with the at least one further modular building unit positioned on top of the first modular building unit. The floor section may extend in a generally horizontal direction or plane, and may extend in a direction which is generally away from the room section.

The room section may only define part of said room, e.g. in conjunction with a further part of a building comprising the modular building assembly, for example a first building section of a hybrid building, which will be described in more detail below. The room section may however define substantially the entire room.

The floor section may define a floor for an internal volume or space defined by a further part of a building comprising the modular building assembly, such as a first building section of a hybrid building. A height of the floor section may therefore be less than a height of the room section. The floor section may be configured to facilitate circulation or transition within the building during use, e.g. facilitating communication between different parts of the building.

The room section and the floor section may be configured so that they together overlie at least a substantial part, and/or a majority, of the lbotprint of the first modular building unit. The room section and the floor section may be configured so that they together overlie substantially the entire footprint of the first modular building unit.

The floor section may he configured to support or define at least part of a landing, and the access mute may open on to, and/or may conummicate with, the landing. Where there is an aperture that conummicates with the main part of the staircase in Lhe First modular building unit, Lhe aperture may open adjacent to the landing.

The room section may he configured to support or define at least part of a landing, and the access route may open on to, and/or may conummicate with, the landing. Where the room section comprises an aperture that communicates with the main part of the staircase in the first modular building unit, the aperture may open adjacent In the landing.

The floor section may he configured to provide access into the room section. The floor section may he configured to support or define aL least part (il-a floor, which may: communicate with the internal volume of the room section; and/or provide access (optionally direct access) into the internal volume of the room section.

The floor section may be adjacent to the room section, in particular laterally adjacent, considered for example in a generally horizontal plane or direction. The floor section may be disposed immediately adjacent to the room section, and/or in contact with the room section. A perimeter portion of the floor section may be configured to be positioned adjacent, optionally abutting and/or in contact with, a perimeter portion of the room section. The further modular building unit may be a second modular building unit. The assembly may comprise a third modular building unit, and may comprise one or more further modular building unit. The third modular building unit may comprise a room section defining an internal volume configured to fa at least part of at least one room of the building (but not a floor section of the type defined above). The floor section may then be configured to be positioned adjacent to the room section of the third modular building unit. The floor section may provide access into the room section of the third modular building unit.

The further modular building writ may be a second modular building unit. The further portion of the footprint of the first modular building unit which is overlaid by the floor section may be a second portion of the footprint.

The modular building assembly may comprise a third modular building unit, which may comprise an internal volume, the internal volume optionally configured to font at least part of at least one further room of the building. The third modular building unit may be configured to be positioned on top of the rust modular building unit overlying a third portion of its footprint. The room and floor sections of the second modular building unit, and the third modular building unit, may be configured so that they together overlie at least a substantial part, and/or a majority, of the footprint of the first modular building unit. The room and floor sections, and the third modular building unit, may be configured so that they together overlie substantially the entire footprint of the first modular building unit.

The first modular building unit may he configured to form at least part of at least one room of the building. Said part of the room defined by the room section of the further modular building unit may be a further room. Said part of the room defined by the internal volume of the first modular building unit may provide living space. The first modular building unit, in particular said part of the at least one room, may comprise a wet facility. The at least one room may be selected from the group comprising: a hallway; a washroom or W/C; and a utility or teclmical room/space.

The room defined at least partly by the internal volume of the room section may: provide living space; and/or may comprise a wet facility. The wet facility may be selected from the group comprising: a washroom or WIC; a bathroom; and an ensuite. Where there are a plurality of further modular building units (e.g. second and third), a room section of at least one of said modular building units, and optionally more than one, may contain a wet facility, or respective wet facilities.

The first modular building unit may comprise a perimeter, which may comprise a plurality of perimeter portions. Each perimeter portion may he disposed transverse to aL least one other perimeter portion. The at least one further modular building unit, in particular its room section, may be configured to overlap at least one perimeter portion of the first modular building mint. The at least one further modular building Ina, in particular its room section, may be configured to extend beyond said perimeter portion in order to overlap it.

The room section may comprise a perimeter, which may comprise a plurality of perimeter portions. Each perimeter portion may be disposed transverse to at least one other perimeter portion. The at least one further modular building unit may be configured to be positioned on top of the first modular building unit so that at least one perimeter portion of the room section is disposed laterally spaced from and/or beyond a perimeter portion of the first modular building unit, which may be a corresponding perimeter portion. Where the fu ther modular building unit, in particular its room section, overlaps at least one perimeter portion of the first modular building unit, said perimeter portion of the further modular building unit may be disposed outwardly or outboard of, and/or not within, the footprint. 'the further modular building unit, in particular its room section, may be adapted to overhang the first modular building unit, and may be adapted to overhang at least one perimeter portion of the first modular building unit, which perimeter portion may be at or may define a side of the first modular building unit. An overhanging portion of the further modular building unit may be configured to form at least part of a porch or awning for a building comprising the modular building assembly. A space may be provided beneath the overhanging portion, which space may define a location for the porch. An overhanging portion of the further modular building unit may be configured to fonn an interior space or volume within the building. Said space may communicate with a further part of the building, in particular with a part of a room defined by the first modular building unit. Said space and said part of the room may together form a completed room in the building.

The at least one further modular building unit may he con figured to be positioned on Lop of the first modular building unit so that at least one perimeter portion of said further unit, in particular its room section, is disposed inwardly or inboard of at least one perimeter portion of the first modular building unit. The at least one perimeter portion of said further modular building unit, in particular its room section, may he disposed inwardly or inboard of, and/or within, the footprint.

The first modular building unit may he elongate, and/or may comprise a main axis extending along a main or primary length direction. The at least one further modular building unit may be elongate, and/or may comprise a main axis extending along a main or primary length direction. The room section and the floor section may he aligned along the main axis, for example the room and floor sections may comprise respective main axes, which may be parallel to, and/or disposed on, the main axis of said unit. The further modular building unit may be configured to be positioned on top of the first modular building unit so that the main axis of the further modular building unit is substantially parallel to the main axis of the first modular building unit, and/or disposed on the main axis.

The footprint of the first modular building unit may he a first footprint. The at least one further modular building unit may comprise a footprint which may be a second footprint. The room section may define a first section of the second footprint, and the floor section may define a second section of the second footprint. The second footprint may be different to the first footprint, e.g. the second footprint may have a different shape to the first footprint, and/or at least one dimension of the second footprint (such as a length or width) may differ from a corresponding dimension of the first footprint. The second footprint may be substantially the same as the first footprint (e.g. the same shape and/or dimensions). Said further modular building unit may be configured to be positioned on top of the first modular building unit so that the second footprint partially overlaps the first footprint, and/or so that the first and second footprints are not aligned. At least pail of the second footprint, in particular at least part of the first section, may overhang a perimeter portion of the first modular building unit.

The first modular building unit may comprise a ceiling stucture. The ceiling structure may be configured to support said further modular building unit, in particular the room section and the floor section. The ceiling structure may comprise at least one suppoit surface for the further modular building unit, in particular for the room section and the floor section. The first modular building unit may comprise a base, which may be defined by a floor structure of the unit. The at least one support surface may be at a height above the base. Where there are a plurality of support suifaces, the suppoit suifaces may be at a common height above the base. A support surface or surfaces for the room section and the floor section may be disposed at a common height above the base.

The floor section may comprise a floor support surface. The room section may comprise a floor support surface. The floor section and the room section may be configured so that their floor support surfaces arc disposed at a common height above a base of the first modular building unit. The floor support surface of the floor section may be configured to support a generally planar floor structure forming a floor of said section. The floor support surface of the at least one room section may be con figured to support a generally planar floor structure forming a floor of said section. The generally planar floor structures may be configured to receive a decorative floor covering. The floor section and the room section may each have a base, and may be configured so that their bases arc disposed at a common height aboyc a base of the first modular building unit.

The floor section may comprise a floor support structure. The floor support structure may define the floor support surface. The floor support structure may comprise a structural frame, which may he of a metallic, timber or timber-based material. Suitable materials can include hot-fonned steel, cold-formed steel (e.g. light gauge steep; timber, composite timber materials such as plywood and oriented strand board (OSB), and combinations of these materials. The floor support structure may be or may comprise a substantially uniform or one-piece structure, such as a sheet e.g. of a cementitious or timber-based material.

The first modular building unit and/or the at least one further modular building unit may be constructed or constructable to a substantially assembled form away from a final location for a building comprising the modular building assembly. The first modular building unit and/or the at least one further modular building unit may he transportable in the substantially assembled form, e.g. to a final site or location for a building comprising the assembly.

t he modular building assembly may be configured to define a circulation space (which may also be referred to as a circulation zone or transition space/zone), which may provide at least one access function for the building, during use. The access fluiction may be selected from the group comprising: access between upper and lower living spaces of the building (e.g. between upper and lower storeys); access between a first living space and at least one further living space, said living spaces optionally being isolated from one another within another part of the building, optionally on a same level/storey (e.g. via a hallway/landing and one or more doorway or walkway); and access into the building from the outside/exterior (e.g. via one or more doorway or walkway, and optionally also a hallway). The first modular building unit may be configured to define at least part of the circulation space. The at least one further modular building unit may be configured to define at least part of die circulation space. The first and at least one further modular building unit may be configured to together fomi the circulation space, and so may each form part of the circulation space.

According to a second aspect, there is provided a building system comprising a first building section and a second building section, the first and second building sections together configured to form at least part of a building, in which the second building section comprises a modular building assembly, the modular building assembly comprising: a first modular building unit comprising an internal volume, the first modular building mat having a footprint; aL least one further modular building unit comprising: a room section defining an internal volume configured to fella at least part of at least one room of the building; and a floor section extending laterally from the room section; in which said further modular building unit is configured to be positioned on top of the first modular building unit so that the room section overlies a first portion of the footprint of the first modular building unit, and so that the floor section overlies a further portion of the lbotprint.

According to a third aspect, there is provided a building comprising a first building section and a second building section, the first and second building sections together forming at least part of the building, in which the second building section comprises a modular building assembly, the modular building assembly comprising: a first modular building unit comprising an internal volume, the first modular building unit having a footprint; at least one further modular building unit comprising: a room section defining an internal volume forming at least part of at least one room of the building; and a floor section extending laterally from the room section; in which said further modular building unit is positioned on top of Lhe first modular building unit so that the room section overlies a first portion of the footprint of the first modular building unit, and so that the floor section overlies a further portion of the footprint.

Optional further features of the building system and/or building are as follows.

The building may be a hybrid building, in particular a hybrid residential building. The first building section may be an on-site construction at a final location for the building. An internal vohune of the second building section may be defined at least partly by the modular building assembly, and may be defined substantially entirely by the modular building assembly. The first and at least one further modular building units may be configured to be constructed away from a final location for the building, for example in a factory or facility that is spaced from the final location. The facility may be located away from a site containing the final location, but could be located on the site, e.g. in the case of a large building site containing multiple plots, each plot fanning a final location for a building. The first and at least one further building sections may be configured to be connected/fitted together at the final location to form the building.

The building may be a modular building comprising a plurality of modular building units. At least some of the modular building units may be arranged to form a modular building assembly or assemblies according to the second/third aspect. An internal volume of the building, optionally excepting an upper or outer roof of the building, may be formed entirely by said units/assemblies.

Further features of the building system/building, in particular of the modular building assembly, may be derived from the text set out elsewhere in this document, in particular in or with reference to the first aspect.

According to a fourth aspect, there is provided a method of constructing a building comprising the steps of constructing a first building section; constructing a second building section at least partly comprising a modular building assembly; and connecting the first and second building sections at a final location for the building; in which the step of constructing the second building section comprises: at a location away from the final location, constructing a first modular building unit to a substantially assembled form, comprising providing the first modular building unit with an internal volume and a footprint at a location away from the final location, constructing at least one further modular building unit to a substantially assembled form, comprising providing said further modular building unit with a room section defining an internal volume forming aL least part of aL least one room of the building, and a floor section extending laterally from the room section; transporting the first modular building unit and the at least one further modular building unit to the final location in their substantially assembled forms; positioning the first modular building unit at the final location; and forming the modular building assembly by positioning the at least one further modular building unit on Lop or the first modular building Line so that the room section overlies a last portion of its footprint, and so that the floor section overlies a further portion of its footprint.

The method may comprise arranging the room section and the floor section so that they together overlie at least a substantial part, and/or a majority, of the footprint of the first modular building unit. The method may comprise arranging the room section and the floor section so that they together overlie substantially the entire footprint of the first modular building unit.

The method may comprise arranging the first modular building unit so that it provides or defines at least part of an access route or pathway, which may provide access from the first modular building unit to at least one of: a) a floor supported or defined by the floor section; and b) the internal vohune of the room section.

The method may comprise providing the first modular building unit with lat least a main part of a staircase, which may fonn said part of the access route. The step of constructing the first modular building unit may comprise providing the unit with a ceiling stmcture. The method may comprise arranging the first modular building unit, and the floor section of said further modular building unit, so that all aperture is provided in and/or extending through the ceiling structure when the floor section unit is positioned on the first modular building unit. The method may comprise arranging the aperture so that it communicates with the main part of the staircase. The method may comprise providing the floor section with all aperture, which may communicate with the main part of the staircase in the first modular building unit when the further modular building unit is positioned on top of the first modular building unit. The method may comprise providing the room section with all aperture, which may communicate with the main part of the staircase in the first modular building unit when the further modular building unit is positioned on top of the first modular building unit.

The method may comprise arranging the floor section so that it supports or defines at least part of a landing, and optionally arranging the access route so that it opens on to, and/or communicates with, the landing. Where the floor section comprises an aperture that communicates with the main part of the staircase in the lirst modular building unit, the method may comprise arranging the aperture so that it opens adjacent to the landing.

The method may comprise arranging the room section so that it supports or defines at least part of a landing, and optionally arranging the access route so that it opens on to, and/or communicates with, the landing. Where the room section comprises an aperture that communicates with the main part of the staircase in the first modular building unit the method may comprise arranging the aperture so that it opens adjacent to the landing.

The method may comprise arranging the floor section so that it provides access into the room section. The method may comprise arranging the floor section so that it supports or defines at least part of a floor, which may: communicate with the internal volume of the room section; and/or provide access (optionally direct access) into the internal vohune of the room section.

The method may comprise arranging the floor section so that it is adjacent to the room section, in particular laterally adjacent, considered ibr example in a generally horizontal plane or direction. The method may comprise positioning the floor section inunediately adjacent to the room section, and/or in contact with the room section. The method may comprise positioning a perimeter portion of the floor section adjacent, optionally abutting and/or in contact with, a perimeter portion of the room section. The method may comprise providing the modular building assembly with a plurality of further modular building units, and arranging at least one of said units so that it comprises a room section defining an internal volmue forming at least part of at least one room of the building (but not a floor section of the type defined above). The method may then comprise positioning the floor section adjacent to at least one of said further modular building units, in particular adjacent to the room section of said unit. The method may comprise arranging the floor section so that it provides access into the room section of said further modular building unit.

The further modular building unit may be a second modular building unit. The further portion of the footprint of the first modular building unit which is overlaid by the floor section may be a second portion of the footprint.

The step of constmcting the second building section may comprise: at a location away from the final location, constructing a third modular building unit, comprising providing the third modular building unit with an internal volume, and optionally arranging the internal volume so that it fonns at least part of at least one further room of the building. The method may further comprise: transporting the third modular building unit to the final location in its substantially assembled form; and positioning the third modular building unit on top of the first modular building unit overlying a third portion of its footprint. The method may comprise arranging the room and floor sections of the second modular building unit, and the third modular building unit, so that they together overlie at least a substantial part, and/or a maim*, of the footprint of the first modular building unit. 'the method may comprise arranging the room and floor sections of the second modular building unit, and the third modular building unit so that they together overlie substantially the entire footprint of the first modular building unit.

The method may comprise and arranging the internal volume of the first modular building unit so that it forms at least part of at least one room of the building. Said part of the room defined by the room section of the further modular building unit may be a further room. The method may comprise arranging said part of the room defined by the intemal volume of the first modular building unit so that it provides living space. The method may comprise arranging the first modular building unit, in particular said part of the at least one room, so that it comprises a wet facility. The at least one room may be selected from the group comprising: a hallway; a washroom or W/C; and a utility or technical room/space.

The method may comprise arranging said part of the room defined at least partly by the internal volume of the room section so that it: provides living space; and/or comprises a wet facility. The wet facility may be selected from the group comprising: a washroom or W/C; a bathroom; and an ensuite. Where there are a plurality of further modular building units (e.g. second and third), a room section of at least one of said modular building units, and optionally more than one, may be arranged so that it contains a wet facility, or respective wet The method may comprise providing the first modular building unit with a perimeter, which may comprise a plurality of perimeter portions, each perimeter portion optionally disposed transverse to at least one other perimeter portion. The method may comprise arranging the at least one further modular building unit, in particular its room section, so that iL overlaps aL least one perimeter portion of the first modular building unit.

The method may comprise arranging the at least one further modular building unit, in particular its room section, so that it extends beyond said perimeter portion in order to overlap it.

The method may comprise providing the room section with a perimeter, which may comprise a plurality of perimeter portions, each perimeter portion optionally disposed transverse to at least one other perimeter portion.

The method may comprise arranging the at least one further modular building unit so that at least one perimeter portion of the room section is disposed laterally spaced from and/or beyond a perimeter portion of the first modular building unit, which may be a corresponding perimeter portion. Where the further modular building unit, in particular its room section, overlaps at least one perimeter portion of the first modular building unit, the method may comprise positioning said perimeter portion of the further modular building unit outwardly or outboard of and/or not within, the footprint. The method may comprise arranging said further modular building unit, in particular its room section, so that it overhangs the first modular building unit, in particular so that it overhangs at least one perimeter portion of the first modular building Lunt, which perimeter portion may be at or may define a side of the first modular building unit. The method may comprise arranging the further modular building unit so that an overhanging portion of the further modular building unit, in particular its room section, forms at least part of a porch or awning for the building. The method may comprise arranging the further modular building unit so that an overhanging portion of said unit fonns an interior space or volume within the building.

The method may comprise positioning the aL least one further modular building unit so that aL least one perimeter portion of said further emit, in particular its room section, is disposed inwardly or inboard of at least one perimeter portion of the first modular building unit. The at least one perimeter portion of said further modular building unit, in particular its room section, may he disposed inwardly or inboard of, and/or within, the footprint.

The first modular building unit may be elongate, and/or may comprise a main axis extending along a main or primary length direction. The at least one further modular building unit may be elongate, and/or may comprise a main axis extending along a main or primary length direction. The method may comprise arranging the room section and Lhe floor section so that they are aligned along the main axis, for example the room and floor sections may comprise respective main axes, and the method may comprise arranging said axes so that they are parallel to, and/or disposed on, the main axis of said unit. The method may comprise arranging the at least one further modular building unit so that its main axis is disposed substantially parallel to the main axis of the first modular building unit and/or on the main axis.

The footprint of the first modular building unit may he a first footprint. The method may comprise providing the at least one further modular building unit with a footprint, which may he a second lbotprint. The method may comprise arranging the room section so that it defines a first section of the second footprint, and arranging the floor section so that it defines a second section of the second footprint. The method may comprise arranging the second lbotprint so that it is different to the first footprint e.g. providing the second lbotprint with a different shape to the first footprint, and/or so that at least one dimension of the second footprint (such as a length or width) differs from a corresponding dimension of the first footprint. The method may comprise arranging the second footprint so that it is substantially the same as the first footprint (e.g. the same shape and/or dimensions). The method may comprise arranging the further modular building unit so that the second footprint partially overlaps the first footprint, and/or so that the first and second footprints are not aligned. The method may comprise arranging at least part of the second footprint, in particular at least part of the first section, so that it overhangs a perimeter portion of the first modular building unit.

The method may comprise providing the first modular building unit with a ceiling structure, and arranging the ceiling stricture so that it supports said further modular building unit and the modular floor unit, in particular the room section and the floor section. The method may comprise providing the ceiling structure with at least one support surface for the further modular building unit, in particular for the room section and the floor section. The method may comprise providing the first modular building unit with a base, which may be defined by a floor structure of the unit. The at least one support surface may be provided at a height above the base. Where there are a plurality of support surfaces, the support surfaces may be at a conunon height above the base. The method may comprise providing a support surface or surfaces for the room section and the floor section at a common height above the base.

The method may comprise providing the floor section with a floor support surface, and providing the room section with a floor support surface. The method may comprise arranging the floor section and the room section so that their floor support surfaces are disposed at a common height above a base of the first modular building unit. The method may comprise arranging the floor support surface of the floor section so that it supports a generally planar floor structure forming a floor of said section. The method may comprise arranging the floor support surface of the at least one room section so that it supports a generally planar floor structure forming a floor of said section. The generally planar floor structures may be configured to receive a decorative floor covering. The method may comprise providing each of the floor section and the mom section with a base, and arranging the bases at a conunon height above a base of the first modular building unit.

The method may comprise constructing the first modular building unit, and/or the at least one further modular building unit, to a substantially assembled form away from the final location. The method may comprise transporting the first modular building unit, and/or the at least one further modular building unit, to the final location in the substantially assembled fora The method may be a method of constructing a hybrid building, in particular a hybrid residential building. The method may comprise constructing the first building section on-site at the final location. 'the method may comprise forming an internal volume of the second building section at least partly using the modular building assembly, and optionally substantially entirely using the modular building assembly. The lirst and second modular building units may be constructed away from the final location, for example in a factory or facility that is spaced from the final location. The method may comprise connecting and/or fitting the first and second building sections together at the final location to Ibrm the building.

The second building section may be assembled at the final location prior to construction and connection of the first building section to the second building section. The fast modular building unit may be positioned at the final location, and a part of the first building section then constructed (e.g. a lower floor/storey) and optionally connected to the first modular building unit. The at least one further modular building unit may then be positioned on the first modular building omit, and a further part of the first building section (e.g. an upper floor/storey) may be constructed and optionally connected to one or more of the fast modular building unit and said further modular building unit.

The first building section may be constructed at the final location and the second building section then assembled and optionally connected to the first section, for example during assembly. The second building section may be assembled within a perimeter or boundary defined by the first building section.

The method may be a method of constructing a modular building comprising a plurality of modular building units. The method may comprise amanging at least sonic of the modular building units to fonn the modular building assembly or modular building assemblies according to the fourth aspect. An internal volume of the building, optionally excepting an upper or outer roof of the building, may be Mimed entirely by said nuts/assemblies.

Further features of the method may he derived from the text set out elsewhere in this document, particularly in or with reference to any one of the first to third aspects.

Reletrence is also made to the hybrid building and associated construction methods disclosed in international patent publication nos. W02022/243696, W02022/243695, W02022/243694 W02022/243693 and W02023/222853, the disclosures of which are incorporated herein by this reference.

Embodiments of the present invention will now be described, by of example only, with reference to the accompanying drawings, in which: Fig. I is an isometric view of a building comprising a fast building section, and a second building scram defined by a modular building assembly, according to an embodiment of the invention; Fig. 2 is an enlarged, detailed isometric view of the modular building assembly shown in Fig. I, with certain features removed for ease of illustration, the assembly drawn to a larger scale and viewed from a rear left 40 comer; Fig. 3 is an exploded isometric view of Lhe modular building assembly shown in Fig. 2; Fig. 4 is a side view of the modular building assembly shown in Fig. 2, taken in the direction of the arrow A in Fig. I; Figs. 5 and 6 are floorplan views of lower and upper storeys, respectively, of the building shown in Fig. 1; Fig. 7 is a plan view of a floor frame portion of a structural frame fanning part of a lower modular building unit of the assembly shown in Fig. 2; Fig. 8 is a plan view of the modular building assembly of Fig. 2, following stacking of an upper modular building unit of the assembly on the lower modular building unit; Fig. 9 is a further enlarged view of a part of the lower modular building unit of Fig. 2, viewed from a different angle; Fig. 10 is a further enlarged isometric view of the modular building assembly of Fig. 2, showing a front left comer region of a ceiling frame portion of the lower modular building unit; Fig. 11 is an enlarged side view of the modular building assembly shown in Fig. 4, showing a rear part of the ceiling frame portion of the lower modular building unit; Fig. 12 is an enlarged vertical cross-sectional view of part of a foundation of the building shown in Fig. 1, showing the lower modular building unit located on the Foundation; Fig. 13 is a detailed isometric view of a modular building assembly according to another embodiment of he invention, similar to Fig. 2; Fig. 14 is an exploded isometric view of the modular building assembly shown in Fig. 13; Fig. 15 is a side view of the modular building assembly shown in Fig. 13, taken in the direction of the arrow B in Fig. 13; Fig. 16 is a detailed isometric view of a modular building assembly according to a further embodiment of the invention, similar to Fig. 2; Fig. 17 is an exploded isometric view of the modular building assembly shown in Fig. 16; Fig. I R is an enlarged, detailed isometric view of a modular building assembly according to a still further embodiment or the invention, similar to Fig. 2; Fig. 19 is an exploded isometric view of the modular building assembly shown in Fig. 15; and fig. 20 is a side view of the modular building assembly hown in Fig. 18, taken in the direction of the arrow C in Fig. 18.

Turning firstly to Fig. 1, there is shown an isometric view of a building according to an embodiment of the invention, the building indicated generally by reference numeral 10. In the illustrated embodiment, the building is a residential building, in particular a hybrid residential building in the form of a detached house. 'the principles of the invention call however apply to other types of house, including semi-detached, terraced and townhouses. In addition, the principles of the invention can apply to other residential buildings such as flats/apartments and hotels, and indeed to non-residential buildings, e.g. industrial or commercial buildings. In general, the principles of the invention can apply to any building having a plurality of storeys.

the building 10 comprises a modular building assembly, which is shown in solid outline in fig. 1, and indicated by reference numeral 12. The modular building assembly 12 is shown separately in Fig. 2, which is a detailed isometric view of the assembly, with certain features (particularly internal and/or external wall panels) removed, for ease of illustration. The assembly 12 is drawn to a larger scale in Fig. 2, and viewed from a rear left collier of the building 10. Figs. :3 and 4 are also referred to. Fig. 3 is an exploded isometric view of the assembly 12 shown in Fig. 2, whilst Pig. 4 is a side view of the assembly taken in the direction of the anew A in Fig. 1.

The assembly 12 comprises a first modular building unit 14 comprising an internal volume 16, the first modular building unit having a lbotprint (shown cross-hatched in Fig. I and indicated by numeral 1 5). The assembly 12 also comprises at least one further modular building unit 20 comprising a room section 21 defining an internal volume 22 configured to form at least part of at least one room of the building 10, and a floor section 26 extending laterally from the room section. The further modular building unit 20 is configured to he positioned on top of the first modular building unit 14 so that the room section 21 overlies a first portion of its footprint (shown cross-hatched in Fig. I and indicated by numeral 24), and so that the floor section 26 overlies a further portion of the footprint (shown cross-hatched in Fig. I and indicated by numeral 27). Fig. 3 shows the further modular building unit 20 separately from, and prior to positioning on top of the lower unit 14.

The modular building unit 14 forms a lower unit of the assembly 12, and the further modular building unit 20 forms all upper unit of the assembly. The upper modular building unit 20 is stacked on the lower modular building unit I4_ In the illustrated embodiment, only a single further modular building unit is provided (the unit 20), although in further embodiments which will be described below, a modular building assembly can be provided comprising a plurality of such further (upper) modular building units.

In the hybrid building 10 of this embodiment, the building comprises a first building section 28, shown in broken outline in Fig. 1, and a second building section 30. The first building section 28 is an on-site construction at a final location 32 for the building, and is approximately L-shaped in plan-view (although not restricted to that shape). The second building section 30 is fonned or defined by the modular building assembly 12 and, in the illustrated embodiment, has a generally rectangular shape in plan-view, defined by the first modular building unit footprint 18. As can be seen particularly in Fig. 4, viewed from the side, the modular building assembly 12 is generally L-shaped. The lower modular building Turn 14 and the upper modular building unit 20are constructed to a substantially assembled form away from the final location 32, for example in a dedicated factory or facility. The units 14 and 20 are each transported to the final location 32 in their substantially assembled form, and arranged to form the modular building assembly 12 (and so the second building section 30). The lower modular building unit 14 and the upper modular building unit 20 are of the same general construction, which will be discussed in more detail below.

As explained in detail in International patent publication nos. W02022/243696, W02022/243695, W02022/ 243694, W02022/243693 and W02023/222853, the hybrid building 10 is formed by connecting the first and second building sections 28 and 30 together at the final location 32. Ntunerous construction options exist, as will be explained briefly below. llowever, in the illustrated embodiment, the second building section 30 (defined by the modular building assembly 12) is effectively built-in to the first building section 28, the first section being constructed around the second building section so as to enclose or encapsulate it within the structure of the first section.

Reference is also made to Figs. 5 and 6, which are flooplan views of lower 34 and upper 36 storeys respectively of the building 10 shown in Fig. 1. The lower modular building emit 14, and the room section 21 of the upper unit 20, are shown in hold outline in the drawings. The modular building unit 14 comprises a structural frame, indicated generally by numeral 38. The structural frame 38 comprises a floor frame portion 40 configured to support a planar floor stractue" a ceiling flame portion 42, and a support structure 44 extending between and connecting the floor frame portion to the ceiling frame portion. Numerous options for fonn ma the structural frame 38 exist. Preferred options include a metallic frame, which can be of a cold-finned metal or metal alloy (e.g. light gauge steel), a hot fonned metal or metal alloy (e.g. hot rolled steel), or combinations of the two. A hot-formed metallic frame may provide a sufficiently rigid structure so that additional perimeter support posts and bracing struts can be dispensed with (or the number of posts/struts reduced). Other options include timber-based frames. In the illustrated embodiment however, the structural frame 38 is formed from a combination of hot-formed steel and cold-formed steel, comprising elongate members which may be of a generally hollow box shape in cross-section, or channels having a C, 1, or U-shape. The floor frame portion 40 and the ceiling frame portion 42 comprise respective perimeter frames (or ring beams) 46,48 formed from structural elements of hot-rolled steel. The support structure 44 limns external side walls of the modular building unit 14, and typically comprise cold-formed structural elements. 1' or example, and referring to internal end wall 49 of the unit 14 shown in Fig. 2, the end wall comprises: comer support posts or columns 50 and 52; intennediate support posts or cohunns 54 and 56; cross brace 58; and 1K-braces' 60 and 62. Connection methods for structural components of the frame can include welding (metallic frames, particularly hot-formed components), bonding and mechanical fixations such as nut and bolt assemblies, rivets and self-drilling screws (1tek screws').

As can he seen from Figs. 1, 5 and 6, the second building section 30 fits with the generally L-shaped first building section 28 in order to fonn a building having a generally rectangular shape in plan-view. Other shapes arc of course possible. The lower modular building unit 14 can have any suitable dimensions, with the proviso that it will generally be required to be transported e.g. by road or rail from the factory to the final location 32. The illustrated unit 14 is around 5300mm to 5400mm in length, and around 2500nun to 2600min in width, which is particularly suited to such transportation. The lower mrit 14 is smaller than many conventional modular building units, which can facilitate transportation and handling, as well as material, weight and cost savings. Although the illustrated lower unit 14 extends only part way between the front and back of the building 10, other units according to the invention may extend the fill length of the building, and so may e.g. have a greater length dimension. The upper modular building unit 20 is of course arranged to fit on top of the lower modular building unit 14, and so of generally the same width, but the room s)xtion 21 has a smaller length than the lower nut 14. The room section 21 of the upper unit 20 is of similar construction to the lower unit 14, and will not be described in detail here.

As can be seen particularly from Figs. 1 and 2, the room section 21 of the upper modular building unit 20 overlies only the first footprint portion 24, whilst the floor section 26 overlies the further footprint portion 27.

This may provide greater design freedom for the upper storey 36 of the building 10, the upper storey including, and/or being formed at least partly by, the room section 21 and the floor section 26. For example, living space provided in the upper storey of the building 10, and access into such living space, may be less restricted by the shape and/or size of a structural frame 64 of the room section 21 (in particular a support structure 66 of the room section). This is because the living space/access is less restricted by a requirement to fit around the structural frame 64, particularly upright support posts of the frame.

Reference will now be made to Fig. 7, which is a plan view of the floor frame portion 40 of the lower modular building unit structural frame 38, and Fig. 8, which is a plan view of the assembly 12 following stacking of the upper unit 20 on the lower unit 14. The footprint 18 of the lower modular building unit 14 is the area on, in or above the ground which the unit accommodates, measured from outer surfaces or boundaries of the unit. In this embodiment, the lower unit 14 comprises front 67, rear 68, left side 70 and right side 72 boundaries which together define the footprint 18 (the footprint being the area bound or bordered by the boundaries). These boundaries are effectively defined by the floor frame portion 40, and the sides of the mit 14.

The first and second portions 24, 27 of the footprint which are overlaid respectively by the room section 21, and the floor section 26, are shown in Fig. 7 cross-hatched. The room section 21 and floor section 26 overlie the respective portions 24 and 27 of the footprint in that they substantially cover the portions of the footprint, when viewed from above or in plan. The footprint portions 24 and 27 each have a respective perimeter, and the room section 21 and floor section 26 extend at least up to the respective perimeter, in order to overlie the footprint portions. This is best shown in Figs. 1 and 2. The room section 21 and the floor section 26 arc configured so that they together overlie a majority of the footprint 18, excepting a stairwell aperture 74 shown in Fig. 8, which will be described in more detail below.

The lower modular building unit 14 defines at least part of an access route or pathway, which provides for access From the lower unit to at least one ot1 a) a floor 76 (Figs. 2 and 3) supported or defined by the floor section 26; and b) the internal volume 22 of the room section 21. In this embodiment, the lower unit 14 provides access to the floor 76 of the floor section 26, which in turn provides access into the internal volume 22 of the room section 21, via a walkway aperture in the fonn of a doorway 78. 'the access route is provided by means of a staircase 81) in the modular building assembly 12, shown in Fig. 9, which is a further enlarged view of a part of the lower unit 14 of Fig. 2, viewed from a different angle. The lower modular building unit 14 comprises a main part 82 of the staircase 80, which is positioned in the internal volume 16 of the lower unit. The main staircase pat 82 is typically installed during construction of the lower mitt 14, and so in the factory/facility. The staircase 80 is typically completed at the final location, following positioning of the upper unit 20 on the lower unit 14, for example by connecting an uppermost riser/step portion (not shown) to an uppermost step 84 of the main staircase part 82.

The lower modular building unit 14 comprises a ceiling structure, which in this embodiment is the ceiling frame portion 42. The stairwell aperture 74 extends through the ceiling frame portion 42, to provide access to the floor 76 when the floor section 26 is positioned on the lower modular building unit 14. The floor section 26 includes a corresponding aperture 86, which aligns with the aperture 74 in the lower unit ceiling frame portion 42. This facilitates the required communicate with the main staircase part 82 in the lower unit 14 when the floor section 26 has been positioned on top of the lower unit.

The floor section 26 is configured to define at least part of a landing, and in the illustrated embodiment, defines a complete landing 8/1 (Figs. 2, 9). The access route provided by the staircase RO opens on to the landing RR.

This is achieved by anunging the aperture 86 of the floor section 26 so that it opens adjacent to the landing 88. An occupant of the building 10 may therefore pass from the lower storey 34 of the building 10 by entering the lower modular building unit 14, passing up the staircase 80 through the aligned apertures 74 and 86, and stepping on to the landing 88 defined by the floor 76. This provides access not only to the internal volume 22 of the room section 21, but also to areas of the building 10 defined by the first building section 28, including living space such as bedrooms, which will be discussed in more detail below.

As can be seen particularly in Figs. 2 to 4; the floor section 26 extends laterally from the room section 21, following positioning of the upper modular building unit 20 on top of the lower modular building unit 14. The floor section 26 extends in a generally horizontal direction or plane, generally away from the room section 21.

The floor section 26 is positioned laterally adjacent to the room section 21, and in contact with the room sec Lion_ This provides for the required access from the floor 76 into the room section internal vohune 22. A perimeter portion 90 of the floor section 26 is positioned adjacent to, and in abutment with, a perimeter portion 92 of the room section 21 (see Fig. 2), the perimeter portion communicating with or including the doorway 78.

The floor section 26 effectively defines a floor for an internal volume or space defined by a further part of the building 10, in particular by the first building section 28. This can he seen by comparing Fig. I with Figs. 5 and 6. The first building section 28 comprises an internal volume 94, which includes a generally L-shaped portion 95 having a footprint 96, shown cross-hatched in Fig. I. The internal volume 94 also includes a further generally cubic or cuboid portion 98 which is effectively disposed above the floor section 26. The floor section 26, in particular its floor 76, therefore defines a floor for the cuboid internal volume portion 98. A height HI (Fig. 5) of the modular floor unit 26 is therefore considerably less than a height 112 of the room section 21.

The internal volume 16 of the lower modular building unit 14 is configured to fonn at least part of at least one room of the building, in particular a room comprising a wet facility. Referring to Fig. 5, it can he seen that the internal vohune 16 of the lower unit 14 comprises a washroom or WIC 100, containing wet facilities in the fonn of a toilet 102 and a sink or washbasin 104. The lower unit 14 additionally defines a hallway 106, and a utility or technical room 107. The technical room 107 contains equipment providing service fimctions within the building 10, including but not limited to a ventilation system, water heating and storage equipment, space heating equipment and laundry facilities (e.g. washer/drier). The internal volume 22 of the upper modular building unit room section 21 is similarly configured to form at least part of at least one room of the building, again particularly a room comprising a wet facility. Referring to Fig. 5, it can be seen that the internal vohune 22 of the room section 21 defines a bathroom, containing wet facilities in the form of a bath 108, toilet 110 and a sink or washbasin 112.

Referring to Fig. 7, the lower modular building unit 14 comprises a perimeter, which is defined by a plurality of perimeter portions. The front 67, rear 68, left side 70 and right side 72 boundaries of the floor frame portion 40 define respective perimeter portions, each of which is disposed transverse to the adjacent perimeter portions. Referring to Figs. 4 and 6, the room section 21 of the upper modular building unit 20 also comprises a perimeter, which is defined by a plurality of perimeter portions. The perimeter portion 92 discussed above forms a rear perimeter portion, and the room section 21 further comprises front 114, left side 116 and right side 1I8 perimeter portions, each perimeter portion again disposed transverse to the adjacent perimeter portions. The upper modular building unit 20 is configured to he positioned on top of the lower modular building unit 14 so that the front 114, left side 116 and right side 118 perimeter portions of the room section 21 align with the respective perimeter portions 67, 70 and 72 of the lower unit 14. The rear perimeter portion 92 of the room section 21 is however disposed laterally spaced Gam the rear perimeter portion 68 of the lower unit 14, and so inwardly or inboard of the rear perimeter portion 68, and within the footprint 18.

Referring hack to Fig. 2, it can he seen that the lower modular building unit 14 is generally elongate, comprising a main axis 120 extending along a main length direction of the unit. The upper modular building unit 20 is similarly elongate, comprising a main axis 122 extending along a main or primary length direction_ The room section 21 in this embodiment is generally cubic or cuboid in shape. The upper unit 20 is configured to be positioned on top of the lower unit 14 so that its main axis 122 is disposed substantially parallel to the main axis 120 of the lower unit. This provides the aligned arrangement of the units 14 and 20 shown in Fig. 2, forming the generally L-shaped structure, viewed from the side.

The upper modular building unit 20 comprises its own footprint I26 (Fig. I), which forms a second footprint of the assembly 12. The second footprint 126 is of course substantially the same as the first footprint 18 of the lower unit 14, the second footprint having the same shape and dimensions. The second footprint 126 therefore matches (and so substantially overlies) the first footprint 18, when the upper unit 20 is positioned on top of the lower unit 14.

Referring back to Fig. 4, the ceiling frame portion 42 (forming the ceiling structure of the lower modular building unit 14) is configured to support tie upper modular building unit 20, and so both the room section 21 and the floor section 26. The ceiling frame portion 42 comprises at least one support surface for the upper modular building unit 20, and in the illustrated embodiment comprises a plurality of support surfaces.

In more detail, the ceiling frame portion 42 comprises a plurality of mounting members for each of the room section 21 and the floor section 26, each mounting member taking the form of a block, post, stub, pin or peg.

One floor section mounting post 13(1 is shown in Fig. 3, and two nodule mounting posts 134 and 136, although it will be understood that additional mounting posts are provided spaced around the ceiling frame portion 42. The mounting posts (e.g. 130, 134 and 136) all extend upwardly from the ceiling perimeter frame 48. A series of apertures are defined between adjacent pairs of mounting posts, spaced around the perimeter of the frame 48. Service conduits can be routed through the apertures, including for the supply of services from the modular building assembly 12 (forming the second building section 30) to the first building section 28. One such aperture shown in Fig. 4 is labelled with the numeral 140. 'Ibe service conduits, and/or other service equipment, can be contained within nnd/or routed through an internal space or void 138 (shown in broken outline in Fig. 3) bordered by die perimeter frame 48, and muted out through the apertures (e.g. 140) to the first building section 28. The service conduits can include, amongst other things, electrical power wires or cables, communication cables, fluid conduits such as lift water supply, ventilation conduits, and wastewater/sewerage conduits. Three such service conduits are shown in Fig. 4, which are an electrical power conduit 139, a water supply conduit 141 and a ventilation conduit 143. Generally speaking, a mounting post will he provided for main structural members of both Lhe room section 21 and the floor section 26, particularly at intersections between the main structural members. For example, and referring to Fig. 2, it will be noted that in addition to the mounting posts 130-134, further mounting posts e.g. 142 and 144 are provided for the floor section 26.

Referring to Fig. 10, there is shown an enlarged view of the modular building assembly of Fig. 2, showing a front left comer region of the ceiling frame portion 42 of the lower modular building unit 14, and the connection between the lower unit. and Lhe upper unit 20. A floor frame portion 146 of the upper unit 20 is shown in Lhe drawing, and comprises a floor perimeter frame (or ring beam) 148. The mounting post 136 shown in the drawing comprises an upper mounting surface 150_ A base or bottom surface 152 of the upper unit 20 is defined by the perimeter frame 148, and is seated on the mounting surface 150. The mounting member 136 typically comprises a mounting component, such as a tapered pin (not shown), which can be located in a socket (not shown) provided in the perimeter frame 148, to locate the units 14 and 20 relative to each another.

The lower modular building unit 14 comprises a base 154 (Fig. 2), which is defined by the floor frame portion 40 (which forms a floor structure or the unit), in particular by the floor perimeter frame 46. The support surfaces defined by the various mounting posts (e.g. the surface 150 of the mounting post 136), for both the room section 21 and the floor section 26, are at a common height H3 (Fig. 4) above the base 154. The perimeter frame 148 extends laterally from the room section 21, so that it also forms a floor perimeter frame lin-the Poor section 26. The room section 21 and the floor section 26 therefore have a common base 155, disposed at the height 113, since the base 155 rests on the support surfaces (e.g. 150) defined by the lower emit 14 mounting posts. A benefit to this is that the floor structures of the room section 21 and the floor section 26 can be of substantially the same height (the height III), which can facilitate standardisation of components.

The floor section 26 also comprises a floor support surface 156, part of which can be seen in the enlarged side view of Fig. 11. The floor support surface 156 supports the floor 76, and is defined by frame members forming the perimeter frame 148. The part of the support surface 156 shown in Fig. 11 is that defined by an end frame member 160 of the perimeter frame 148. The room section 21 similarly comprises a floor support surface 162 (Fig. 4), which supports a floor 164 of the unit (shown in Fig. 2). The room section 21 and the floor section 26 are configured so that their floor support surfaces 156 and 162 are disposed at a conmon height H4 (Figs. 4 and 11) above the base 154 of the first modular building unit 14. A benefit to this is that it avoids a requirement to accommodate a significant change in height at the intersection between the room section 21 and the floor section 26.

the floor section 26 further comprises a floor support structure, which is best shown in Fig. 2, the support structure indicated generally by numeral 166 and taking the fonn of a structural frame. 'the structural frame 166 comprises a part 158 of the perimeter frame 148 which extends from the room section 21. Like the floor and ceiling frame portions 40 and 42 of the lower unit 14, the perimeter frame 148 is formed from structural elements of hot-rolled steel. The structural frame 166 also comprises an intermediate beam 168 extending in the length direction of the floor section 26 between the end beam 160, and a crossbeam 169 of the perimeter frame part 158. The intermediate beam 168 and crossbeam 169 are also formed from hot-rolled steel and, together with the perimeter Frame 158, define or describe the aperture 86 which communicates with the stairwell aperture 74 in the lower unit 14. The structural frame 166 further comprises a plurality ofjoists extending in the width direction, between a side of the perimeter frame part 158 and the intermediate beam 168. One such joist is labelled 172 in the drawing. The various joists are typically of cold-formed (e.g. cold rolled) steel.

The lower modular building unit structural frame 38, room section structural frame 64, and floor section structural frame 166 are typically (il-metallic materials as discussed above, but can he of other materials such as a timber or timber-based material. Suitable materials can include hot-formed steel, cold-formed steel (e.g. light gauge steel), timber, composite timber materials such as plywood and oriented strand hoard (0S13), and combinations of these materials. In a variation, a substantially uniform or one-piece structure may be provided which in place of the floor frame portion 148 of the room section 21 and the floor support structure 166 of the floor section 26. Examples include a sheet e.g. of a cementitious or timber-based material (not shown). The floors 76 and 164 of the floor unit 26 and upper modular building unit 20 are generally planar and, although not shown in the drawings, configured to receive a decorative floor covering of any suitable type, including but not limited to Liles, carpet, laminate/composite materials and the like.

The modular building assembly 12 defines a circulation space configured to provide one or more access function ibr the hybrid building 10. This is shown in Figs. 5 and 6, the circulation space indicated by numeral 176, and shown in broken outline and cross-hatched in the drawings. In the illustrated embodiment, the circulation space 176 provides three access timctions. One such friction is access between lower 178 and upper 180 living spaces of the building 10, provided respectively by the lower and upper storeys 34 and 36 in the first building section 28. This is achieved by means of the staircase 81), the main part 82 of which is located in the lower modular building unit 14 (but could be achieved e.g. via a lift shaft and lift). The living space 178 forms an open-plan kitchen/dining rooni, whilst the living space 180 forms a bedroom, and the circulation space 176 therefore provides access between these different living spaces. The first building section 28 also comprises further living space in the form of a lounge or sitting room 182 which is accessed via the kitchen/dining room 178, and so the circulation space effectively also provides access between the bedroom 180 and the lounge.

Another such function is access between a first living space and at least one further living space of the building 10, the living spaces being isolated from one another within another part of the building. As can be seen in Fig. 6, the first building section 28 comprises the living space 180 (bedroom), and further living spaces 184 and 186, which form second and third bedrooms. The circulation space 176 provides access between these living spaces 180, 184 and 186, by means of walkway openings in the form of doorways 188, 190 and 192, and the landing 88 (which effectively for part of the circulation space). The circulation space 176 additionally provides access between the lower living space 178 (and also the space 182) and the upper living spaces 180, 184 and 186, which are effectively isolated from one another within the first building section 28.

Another such function is access into the building 10 from an exterior 194 of the building, via a walkway opening in the fonn of a doorway 196 of the lower unit 14, which in this case fonns a front or main doorway for the building. The doorway 196 opens on to the hallway 106 to provide access to the staircase 80 (for access to the upper living spaces ISO, 184 and 186), and an internal walkway in the limn of a doorway 198 (for access to the lower living spaces 178 and 182).

Whilst the illustrated modular building assembly 12 comprises a circulation space 176 which provides all three access functions described above, it will be understood that variations may provide only one or only sonic of the stated functions.

It will also be understood that the lower modular building taut 14 and the upper modular building unit 21) are each configured to define a part of the circulation space 176. In particular, the lower unit 14 comprises the main part 82 of the staircase, the stairwell aperture 74, the main or front doorway 196, the hallway 106, and the internal doorway 198, which may be considered to form part of the circulation space 176. Similarly, the upper unit 21) (in particular its floor section 26) can comprise part of the staircase 81), and comprises the aperture 86 and the landing 88. The room section 21 of the upper modular building unit 20 may also or alternatively be configured to define at least part of the circulation space, as will be described below in relation to further embodiments.

As explained in the International patent publications mentioned above, numerous construction options exist for the hybrid building 10. The second building section 30 (defined by the modular building assembly 12) may he assembled at the final location 32 prior to construction and connection of the first building section 28 to the second building section. The first (lower) modular building unit 14 may be positioned at the Final location 32, and a part of the first building section 30 then constricted (e.g. a lower floor/storey portion) and optionally connected to the first modular building unit. The further (upper) modular building unit 20 may then be positioned on the lower modular building unit 14, and a further part of the first building section 28 (e.g. an upper floor/storey portion) may be constructed and optionally emmected to one or more of the lower modular building writ and the upper modular building unit.

In a variation, the first building section 28 may be constructed at the fmal location and the second building section 30 then assembled and optionally connected to the first section, for example during assembly. The second building section 30 may be assembled within a perimeter or boundary defined by the first building section 28. This may be achieved by locating the lower modular building unit 14 within the perimeter of the first building section, and then locating the upper modular building unit 20 on the lower unit 14. A first storey portion of the first building section 28 may be constructed first, and then the lower modular building unit 14 located within its perimeter. A second storey portion of the first building section 28 may then be constructed and the upper modular building unit 20 positioned within the perimeter, on the lower unit 14. Whichever construction option is followed, the use of structural insulated panels (SIPs) may be a particularly preferred construction option for the first building section 28.

A roof structure 204 (Fig. I) is typically assembled on site, extending over the first and second building sections 28, 30 and connected to them. Numerous options exist including forming the roof stnicture 204 from roof trusses (not shown), or as a modular (transportable) structure. Joists (not shown) forming ceilings of the lower and upper storeys 21 and 23 in the first building section 28 arc connected to and supported by the lower modular building unit 14, and the upper modular building unit 20, respectively. The lower storey ceiling joists in the first building section 28 will typically he connected to the lower unit 14 prior to building up e.g. the SIP panels forming the upper storey portion and connecting them to the upper unit 20.

The first and second building sections 28 and 30 may rest on a common foundation 206. This is shown in Fig. 12, which is an enlarged vertical cross-sectional view of part of the foundation, showing the lower modular building unit 14 located on it. The foundation 206 supports both the second building section 30 (defined by the modular building assembly 12), and the first building section 28, which has been omitted from the drawing. The foundation 206 is an insulated foundation, comprising a load bearing structure 208 and thennal insulation 210. The modular building unit 14 is located on the foundation 206 so that the load bearing structure 208 provides structural support for the unit, and so that the thermal insulation 210 thermally insulates the modular unit relative to the ground 212. The load bearing structure 208 can take the fonn of a layer of reinforced concrete, which can be formed at the final location 32 for the building in a conventional fashion. Numerous options for forming the thermal insulation 210 exist, including constructing it from a series of shaped blocks (not shown) of a suitable insulating material which can bear the load of the completed building 10 Turning now to Fig. 13, there is shown a detailed isometric view of a modular building assembly I 2a according to another embodiment of the invention, similar to the view of the assembly 12 in Fig. 2. Like components of the modular building assembly 12a with the assembly 12 share the same reference numerals, with the addition of the suffix la. Figs. 14 and 15 are also referred to. Fig. 14 is an exploded isometric view of the assembly 12a shown in Fig. 13. Fig. 15 is a side view taken in the direction of the arrow B in Fig. 13. The modular building assembly 12a can form part of the building 10 and so be provided in place of the assembly 12 shown in Fig. 1.

Only substantive differences between the assembly 12a and the assembly 12 will be described in detail here.

The modular building assembly 12a in this embodiment comprises a lower modular building unit 14a, a second modular building unit 20a and a third modular building unit 214. The second and third modular building units 20a and 214 are each upper mats, positioned on top of the lower milt 14a in the same way as file upper unit 20 is positioned on top of the lower unit 14 in the assembly 12. The second modular building unit 20s comprises a room section 21a defining an internal volume 22a configured to fonn at least part of at least one room of the building 10, and a floor section 26a extending laterally from the room section. The third modular building unit 214 defines all internal vohune 216, and comprises a structural frame 218, similar to the modular building unit 20 in the assembly 12.

A footprint 18a of the lower modular building unit 14a is shown schematically-in the side view of Fig. 15. The room section 21a of the second (upper) modular building unit 20a overlies a tint portion 24a of the footprint Iga" and the floor section 26a overlies a second portion 27a of the footprint I8a. The third (upper) modular building unit 214 is configured to be positioned on top of the first modular building unit 14a overlying a third portion 220 of its footprint 18a. The second modular building unit 20a and the third modular building unit 214 are configured so that they together overlie a majority of the footprint I8a, excepting a stairwell aperture 74a. The modular floor unit 26a again comprises an aperture 86a which communicates with the stairwell aperture 74a, and a main staircase portion (not shown) in the lower unit 14a.

The room section 21 a of the second modular building unit 20a comprises a wet facility, in this case a bathroom again containing a bath 108a, toilet 110a and washbasin 112a. The third modular building unit 214 also comprises a wet facility, the mit in this case forming an ensuite bathroom or washroom for a bedroom in the building 10, particularly for the bedroom 180 (which may form a main or master bedroom). Tn a variation, one or more of the second and third modular building units 20a and 214 may be arranged to define a room in the building 10 in conjunction with the first building section 28. For example, one or more of the units 20a, 214 may be ananged with an open side, so that their interior vohune 22a, 216 fonns part of a room in the building 10, and the first building section 25 may define a further part of the room.

It will be noted that the lower modular building unit 14a in the assembly 12a is somewhat longer than the corresponding unit. 14 in the assembly 12. This may he Ibr numerous reasons, including but not limited fix providing a larger internal volume 16a within the lower unit 14a, for accommodating additional equipment, larger dimension internal rooms/spaces, or additional rooms/spaces; providing a 'front-to-back' module layout, in which the lower unit 14 extends from a front wall to a back wall of the building 10; and providing a proportionally similar internal volume in the modular building assembly (as the assembly 12 does in the building 10) within a larger volume and/or footprint building.

Taming now to Fig. 16, there is shown a detailed isometric view of a modular building assembly 121) according to another embodiment of the invention, similar to the view of the assembly 12 in Fig. 2. Reference is also made to fig. 17, which is an exploded isometric view of the assembly 12b. Like components of the modular building assembly 12b with the assembly 12 share the same reference minerals, with the addition of the suffix 11'. The modular building assembly 12h can form part of the building 10 and so be provided in place of the assembly 12 shown in fig. 1. Only substantive differences between the assembly 12b and the assembly 12 will be described in detail here.

The modular building assembly 12b comprises a lower modular building unit 14b and an upper modular building unit 20b. The upper modular building unit 20b comprises a room section 2 lb defining an internal volume 22 configured to form at least part of at least one room of the building 10, and a floor section 26b extending laterally from the room section. The room section 21b and the floor section 26b of the upper modular building unit 20b together overlie an entire footprint 18b of the lower modular building unit 141), which is shown schematically in the drawing. 'the second modular building unit 20b is positioned on top of the lower unit 14b in the same way as the upper unit 20 is positioned on top of the lower unit 14 in the assembly 12. The upper modular building unit 20h comprises an internal volume 22h, and a structural frame 641), similar to the modular building unit 20 in the assembly 12. In this embodiment however, the room section 211) of the upper unit 20b is arranged to define a plurality of rooms or areas, in this case a bathroom 222 and a room 224 comprising or defining at least part of a circulation space. The room 224 comprises an aperture 86h which communicates with a stairwell aperture 74b defined by the lower modular building unit 14b, and a landing ggb adjacent the aperture gob. The landing 88b is provided by a floor 164b of the room 224. The aperture gob and landing 88h are thus formed in the room section 21 h, rather than by the floor section 26b.

In this embodiment, the room section 21b and the floor section 26b of the upper modular building unit 20b effectively overlie the entire footprint 18b of the lower unit 14b. This is because, although the room section 21b of the upper unit 20b comprises the aperture 86h, the structural Frame 64h of the upper unit 20b comprises a ceiling frame portion 226 which extends over the length of the room section, and so effectively over the aperture 86h. This is in contrast to the floor section 26 of the assembly 12, where the floor section may not he considered to overlie the footprint portion 27 since the internal volume above the aperture 86 is defined by (and so covered bv) structure forming the first building section 28.

In a variation (not shown) on the modular building assembly 12b, the assembly may comprise a plurality of upper modular building units, for example a second modular building unit comprising a room section forming the bathroom 222 (and the floor section), and a third modular building unit forming the room 224. The variation may effectively he a combination of the embodiments I2a and 12h of Figs. 13-15, and Figs. 16/17.

Turning now to Fig. 18, there is shown a detailed isometric view of a modular building assembly 12c according to another embodiment of the invention, similar to the view of the assembly 12 in Fig. 2. Reference is also made to fig. 19, which is an exploded isometric view of the assembly 12c. Like components of the modular building assembly 12c with the assembly 12 share the same reference munerals, with the addition of the suffix c'. The modular building assembly 12c can form part of the building 10 and so he provided in place of the assembly 12 shown in fig. 1. Only substantive differences between the assembly 12c and the assembly 12 will be described in detail here.

The modular building assembly 12c of this embodiment comprises a lower modular building unit 14e which is similar in structure and design to the unit 14 of the assembly 12, excepting a ceiling frame portion 42c which will be discussed below. The assembly 12c also comprises a further modular building unit in the fonn of an upper unit 20e, comprising a room section 21c defining an internal volume 22c configured to foam at least part of at least one room of the building 10, and a floor section 26c extending laterally from the room section. The room section 21c and the floor section 26c of the upper modular building unit 20c are both positioned on top of the lower unit 14c.

A footprint 18c of the lower modular building unit 14c is shown schematically in the side view of Fig. 20, which is taken in the direction of the arrow C in Fig. 18. It will be noted that the footprint 18c excludes a pail 228 of a ceiling frame portion 42c of the lower unit I4c, which extends beyond a front perimeter portion 67c of the lower unit defining a front boundary of the lbotprint lfic. The room section 210 of the upper modular building unit 20c again comprises a wet facility, defining a bathroom, and overlies a first portion 24c of the footprint 18c. The floor section 26e overlies a second portion 27c of the footprint 18c. The room section 21 c and the floor section 26c are configured so that they together overlie a majority of the lbotprint 18c, excepting a stairwell aperture 74c. The floor section The again comprises an aperture 86c which communicates with the stairwell aperture 74c, and a main staircase portion (not shown) in the lower unit 14c.

In this embodiment, a portion 230 of the upper unit room section 21c overhangs the lower modular building unit 14c, extending beyond and overhanging the front perimeter portion 67c of the lower unit. This overhanging portion 230 of the room section 21 c forms at least part of a porch or awning for a building comprising the modular building assembly 12. A space 232 is provided beneath the overhanging portion 230, and defines a location for the porch, the space shown in broken outline in Fig_ 1 A and cross-hatched at the side. in this way, a front perimeter portion 234 of the upper modular building unit 20c is disposed outwardly or outboard of lower unit footprint Ifle.

The ceiling frame portion 42c of the lower unit 14c comprises a perimeter frame 48c, again typically of a hot-formed metallic material. The ceiling frame portion 42c is longer than a floor frame portion 40c of Lhe lower unit 14c, so that its part 228 extends beyond Lhe front perimeter portion 67c of the lower unit 14c. This overhanging part 228 of the ceiling frame portion 42c is effectively cantilevered beyond the front perimeter portion 67c, and supports the overhanging part 230 or the upper unit room section 21c. In addition, the overhanging part 228 can provide El route for services to and from the bathroom provided in the room section 21c, such as water conduits and sewerage conduits servicing a bath 108c, toilet 110c and washbasin 112e. The services are shown schematically in Fig. 16, in broken outline and indicated by numeral 235. These conduits may extend laterally to a position above a technical room 107c in the lower unit 14c, where they are connected to feed/discharge conduits extending upwardly from the teclmical room.

In a variation, the overhanging portion 230 may be configured to fonn an interior space or volume within the building 10, and may communicate with a further part of the building, in particular with part of a room defined by the first modular building unit 14c. By way of example, the lower unit 14c may be configured to define a part of a washroom or WIC adjacent the space 232, and open on a side facing the space. The space 232, together with the part of the washroom in the lower unit 14c, may form a completed washroom in the building 10.

It will be understood that further embodiments can comprise the features of any one or more of the embodiments shown in Figs. 1 to 20 and described above. For example, a variation of the modular building assembly 12a shown in Fig. 13 may comprise a single upper modular building unit defining a plurality of rooms or areas, like the upper unit 20b shown in Fig. 16. A variation of the modular building assembly 12c shown in Fig. 18 may comprise two or more further (upper) modular building units, like the upper units 20a and 214 shown in Fig. 13. In this variation, one of the upper modular building units may be located entirely on the overhanging part 228 of the ceiling frame (i.e. in the position accommodated by the overhanging portion 230 or the upper imit 20c).

Various modifications may he made to Lhe foregoing without departing from the spirit or scope (tithe present invention.

For example, reference is made to said further modular building unit, and the modular floor unit, being positioned on top of the first modular building unit. This may effectively require that said further modular building unit, and the modular floor milt, be positioned above, and supported by or on, the first modular building unit. Typically they will be in direct contact with the first modular building unit, and so positioned directly on the first unit. IMwever, they may be ill indirect contact with the first modular building nth, and so positioned indirectly on the first unit (i.e. not in direct contact, and so Ibr example with an intermediate component, such as a support structure, between them).

Further aspects and/or embodiments of the invention may combine the features of one or more aspect and/or 40 embodiment disclosed in this document. Accordingly such further aspects and/or embodiments may comprise one or more feature selected from one or more aspect or embodiment of the invention disclosed in this document.

Unless explicitly implied by context or stated in the document, the features of any method or process disclosed in this document need not mvessarily he performed in the precise order set out in the relevant text and/or drawings. Accordingly, any method or process disclosed in this document may be capable of being performed in all order other than that specifically set out in the relevant text/drawings, if circumstances permit.

Features disclosed in this document (including any accompanying claims, abstract and drawings) may he replaced by alternative features serving the same, equivalent or similar purpose, miless expressly stated otherwise. Accordingly, features disclosed in this document may represent only one example of a generic series of equivalent or similar features.

Claims

CLAIMS1. A modular building assembly configured lo form at least part of a building, the modular building assembly comprising: a first modular building unit comprising an internal volume, the first modular building unit having a footprint; at least one further modular building unit comprising: a room section defining an internal vohune configured to form at least part of at least one room of the building; and a floor section extending laterally from the room section: in which said thither modular building unit is configured to be positioned on top of the first modular building unit so that the room section overlies a first portion of the footprint of the first modular building unit, and so that the floor section overlies a further portion of the footprint.
2. An assembly as claimed in claim 1, in which file floor section extends in a generally horizontal direction away from the room section.
3. All assembly as claimed ill either of claims 1 or 2, ill which the floor section defines a floor for an intemal volume defined by a further part of a building comprising the modular building assembly. 20
4. An assembly as claimed in any preceding claim, in which the room section and the floor section are configured so that they together overlie a majority of the footprint of the first modular building unit.
5. An assembly as claimed in any preceding claim, in which the first modular building unit is configured to define at least part °fan access route, the access route providing access from the first modular building unit to at least one of: a) a floor defined by the floor section; and b) the internal vohune of the room section.
6. An assembly as claimed in any preceding claim, in which the lirst modular building unit comprises at least a main part of a staircase and a ceiling structure, and in which the first modular building unit and the floor section of said further modular building unit are arranged so that an aperture is provided which extends through the ceiling structure when the floor section is positioned on the first modular building unit, the aperture communicating with the main part of the staircase.
7. An assembly as claimed in claim 6, in which the floor section is configured to define at least part of a landing, and the aperture opens adjacent to the Landing.
8. An assembly as claimed ill any one of claims 1 to 5, in which the first modular building unit comprises at least a main part of a staircase, and the room section comprises an aperture which communicates with the main part of the staircase when the further modular building unit is positioned on top of the first modular building unit.
9. An assembly as claimed in claim 8, in which tho room section is con figured to define aL least part of a landing, and the aperture opens adjacent to the landing.
10. An assembly as claimed in any preceding claim, in which the floor section is configured to define aL least part of a floor which provides direct access into the internal volume of the room section.
11. An assembly as claimed in any preceding claim, in which the floor section is disposed laterally adjacent to the room section, a perimeter portion of the floor section abutting a perimeter portion of the room section.
12. An assembly as claimed in any preceding claim, in which: the further modular building unit is a second modular building unit the assembly comprises a timid modular building unit comprising a room section defin hg an into Lai volume configured to form at least part of at least one firtha room of the building; and the floor section is configured to be positioned adjacent to the room section of the third modular building unit, and to provide access into the room section of the third modular building unit.
13. An assembly as claimed in any one of claims 1 to 11. in which: the further modular building unit is a second modular building unit; the further portion of the footprint of the first modular building unit which is overlaid by the floor section is a second portion of the footprint; and the modular building assembly comprises a third modular building unit, the third modular building unit comprising an internal volume configured to form at least part of at least one further room of the building, and Lhe third modular building unit con figured Lo be positioned on trip of the first modular building unit overlying a third portion of its footprint.
14. An assembly as claimed in claim 13, in which the room section and the floor section of the second modular building unit, and the third modular building unit, arc configured so that they together overlie a majority of the footprint of the first modular building unit.
15. An assembly as claimed in any preceding claim, in which: the internal volume of the first modular building unit is configured to form at least part of at least one room of the building, the at least one room selected from Lhe group comprising a hallway, a room comprising a wet facility, and a technical room: and said part of the room defined by the internal volume of the room section comprises a wet Ihcility.
16. An assembly as claimed in claim 15, when dependent on claim 13, in which the second and third modular building units each comprise respective wet facilities.
17. An assembly as claimed in any preceding claim, in which: the first modular building unit comprises a perimeter, the perimeter comprising a plurality or perimeter portions, each perimeter portion disposed transverse to at least one other perimeter portion; and the room section of the at least one further modular building unit is configured to overlap at least one perimeter portion of the first modular building unit.
18. An assembly as claimed in claim 17, in which: the room section of the further modular building unit comprises a perimeter, the perimeter comprising a plurality of perimeter portions, each perimeter portion disposed transverse to at least one other perimeter portion; and the further modular building unit is configured to be positioned on top of the first modular building unit so that at least one perimeter portion of the room section is disposed laterally spaced from a corresponding perimeter portion of the first modular building unit.
19. An assembly as claimed in claim 18, in which said perimeter portion of the thither modular building unit room section is disposed outboard of the footprint of the first modular building unit.21).
An assembly as claimed in any preceding claim, in which the room portion of the further modular building unit is adapted to overhang at least one perimeter portion of the first modular building unit, which perimeter portion defines a side of the first modular building unit.
21. An assembly as claimed in claim 20, in which the room section of the further modular building mnit is configured so that an overhanging portion of the room section forms at least part of a porch for a building comprising the modular building assembly.
22. An assembly as claimed in any preceding claim, in which the further modular building unit is configured to he positioned on top of the first modular building unit so that at least one perimeter portion of its room section is disposed inboard ()I-at least one perimeter portion of the first modular building unit.
23. An assembly as claimed in any preceding claim, in which: the first modular building unit and the at least one further modular building each comprise respective main axes extending along main length directions of the units; the room section and the floor section of the further modular building unit comprise respective main axes, which are disposed on the main axis of said unit; and the thither modular building emit is configured to be positioned on top of the first modular building unit so that Lhe main axis of the Ihrther modular building unit is disposed substantially parallel to the main axis of Lhe first modular building unit.
24. An assembly as claimed in any preceding claim, in which: the footprint of the first modular building unit is a first footprint; the at least one further modular building unit comprises a footprint, which is a second footprint of the modular building assembly, the room section defining a first section of the second lboLprint and the floor section defining a second section of the second footprint.
25. An assembly as claimed in claim 24, in which at least part ()I-the first section of the second lbotprint overhangs a perimeter portion of the first modular building unit.
26. An assembly as claimed in any preceding claim, in which the first modular building unit comprises: a ceiling structure configured to support the room section and the floor section of the further modular building unit, the ceiling structure comprising a plurality of support surfaces for said sections; and a floor structure defining a base of the first modular building unit in which the support surfaces for the room section and the floor section are disposed at a common height above the base.
27. An assembly as claimed in any preceding claim, in which: the floor section comprises a floor support surface; the mein section comprises a floor support surface; and the floor section and the room section are configured so that their floor support surfaces are disposed at a common height above a base of the first modular building unit.2K.
A building system comprising a first building section and a second building section, the first and second building sections together configured to fa at least part of a building, in which the second building section comprises a modular building assembly, the modular building assembly comprising: a first modular building unit comprising an internal volume, the first modular building unit having a 25 footprint at least one further modular building unit comprising: a room section defining an internal volume configured to form at least part of at least one room of the building; and a floor section extending laterally from the room section; in which said further modular building unit is configured to be positioned on top of the first modular building unit so that the room section overlies a First portion of the lbotprint. of the first modular building unit, and so that the floor section overlies a further portion of the footprint.
29. A building comprising a first building section and a second building section, the first and second building sections together fonning at least pait of the building, in which the second building section comprises a modular building assembly, the modular building assembly comprising: a first modular building unit comprising an internal volume, the first modular building unit having a footprint; at least one further modular building unit comprising: a room section defining an internal volume forming at least part of at least one room of the building; and a floor section extending laterally from the room section; in which said further modular building unit is positioned on top of the first modular building unit so that the room section overlies a first portion of the footprint of the first modular building unit, and so that the floor section overlies a further portion of the footprint.
30. A building system as claimed in claim 28, or a building as claimed in claim 29, in which the modular building assembly comprises the thriller features of any one of claims 2 to 27. 10
31. A method of constructing a building comprising the steps of constructing a first building section; constructing a second building section at least partly comprising a modular building assembly; and connecting the first and second building sections at a final location for the building; in which the step of constructing the second building section comprises: at a location away from the final location, constructing a first modular building urtit to a substantially assembled form, comprising providing the first modular building unit with an internal volume and a footprint, at a location away from the final location, constructing at least one further modular building unit to a substantially assembled fonn, comprising providing said further modular building unit with a room section defining an internal volume forming at least part of at least one room of the building, and a floor section extending laterally from the room section; transporting the first modular building unit and the at least one further modular building unit to the final location in their substantially assembled forms; positioning the first modular building unit at the final location; and forming the modular building assembly by positioning the at least one further modular building unit on top of the first modular building unit, so that the room section overlies a first portion of its lbotprint, and so that the floor section overlies a further portion of its footprint.