Abstract: A prefabricated building system comprising a portable wall unit having a supporting frame and utility apparatus mounted on the supporting frame. The utility apparatus preferably is adjustably mounted on the supporting frame and may comprise plumbing, electrical, heating and/or cooling apparatus for the rooms adjacent to the portable wall unit in the building in which it is to be installed. Prefabricated wall partitions for the adjacent rooms can be assembled with the portable wall unit before shipment to the building site or at the building site. The portable wall unit is provided with means for aligning the wall unit with the adjacent wall partitions to facilitate the assembly thereof.

Abstract: A prefabricated building system comprising wall panels having interior and exterior surfaces with insulation positioned therebetween. The interior and exterior surfaces may be of any suitable finish and appearance, depending on the building to be constructed. Each of the panels is provided with releasable locking devices on the side and/or end edges thereof which are constructed to enable the panels to be locked to adjacent panels, sills or the like after the panels have been positioned in their desired location in the building. The releasable locking devices are actuated from the exterior of the panels so that they can be conveniently locked together or unlocked, if desired, after they have been positioned in their desired locations. Each panel comprises a frame formed of elongated channel members for strength and load bearing capability. The channel members are provided with spaced clip members which serve to support the insulation between the interior and exterior surfaces of the panel.