Abstract: Walls of the prefabricated compact service core structure are higher than the total height of the floor, wall and ceiling structure of an ordinary one-storey residental building, but lower than the total height of a two-storey building of any kind. The height of the walls is large enough to e.g. accommodate the serviced fixtures of complete main floor bathroom, kitchen, and possibly laundry and utility rooms, as well as lower parts of the same rooms of the second storey of a two-storey structure. On the other hand, the height is small enough to make the prefabricated compact service core structure possible to ship on standard low trailers anywhere in the world.

Abstract: A floor or ceiling unit is prefabricated in two halves which can be assembled together to form the unit or one of the halves can be turned upsidedown and nested underneath the other half thus forming a package with upper and lower panels. These panels can be secured together and reduce the overall width of the package to a dimension which is smaller than the maximum allowable width for transportation on world roads. Also included are vertical support members and the pair of perimetrical beams which extend between the vertical support members and means on the beams and support members to receive and support the assembled floor or ceiling unit.

Abstract: A floor or ceiling unit is prefabricated in two halves which can be assembled together to form the unit or one of the halves can be turned upsidedown and nested underneath the other half thus forming a package with upper and lower panels. These panels can be secured together and reduce the overall width of the package to a dimension which is smaller than the maximum allowable width for transportation on world roads.Also included are vertical support members and the pair of perimetrical beams which extend between the vertical support members and means on the beams and support members to receive and support the assembled floor or ceiling unit.

Abstract: A prefabricated statically self-contained cube skeleton unit system is provided comprising two standard square or rectangular ceiling/floor component frames supported on four L-shaped corner wall frames, each supported on the lower frame at three points and each supporting the upper frame also at three points, both of these constituting a standard skeleton unit which can be stacked in vertical direction into a two or more storey cube skeleton with the use of one standard square or rectangular ceiling/floor component between lower and upper cube skeleton storey and which, by attaching one statically self-containing cube skeleton to the other, allows for developing a multi-room clustered structure of unlimited size in horizontal directions of one or more storeys. The vertical openings in the cube skeleton allow for the use of statically non-bearing fill-in walls which can be exchanged, removed and re-erected.