Abstract: A building structure includes a one-piece extruded and cut-to-length structure including integral sidewalls, a roof, and a floor. The sidewalls, roof, and floor are configured to simulate conventional wood frame construction (both in color and surface texture), and include various flanges and integral members to facilitate transport of the building structure, attachment of the building structure to a foundation, and assembly of secondary parts to the building structure. Extruded end walls and intermediate walls are configured to mate with the main extrusion for tight and quick assembly thereto. The wall construction includes a beam-like laminate of outer and inner layers of structure polymer bonded together with rigid foam. An extruded garage and extruded breezeway can be attached to the building structure to form a building having the appearance of a conventional ranch style wood frame residential building.