Abstract: A combination of pre-dimensioned and pre-engineered modular units which form at least a powder room within a room section of a building structure and a method of assembling same. The assemblage includes a interface unit having a drain-waste-vent piping system for the room, the unit being mounted to the surface of the "wet wall" of the room. The walls of the room may be either partially finished or completely finished at the time of assembly of the facility. The interface it provides a unique template for locating the positions of, and for installing the components of the facility. By extending the powder room assemblage to include a bathtub and shower section, a unique full bathroom may be assembled in a very short time according to the method of the invention by persons of limited skills.

Abstract: A combination of pre-dimensioned and pre-engineered modular units which form at least a powder room within a room section of a building structure and a method of assembling same. The assemblage includes an interface unit having a drain-waste-vent piping system for the room, the unit being mounted to the surface of the "wet wall" of the room. The walls of the room may be either partially finished or completely finished at the time of assembly of the facility. The interface unit provides a unique template for locating the positions of, and for installing the components of the facility. By extending the powder room assemblage to include a bathtub and shower section, a unique full bathroom may be assembled in a very short time according to the method of the invention by persons of limited skills.