Abstract: Initially folded wall panels connected by the novel hinge means to the sides of a common roof panel swing downwardly into upright positions as the roof panel is raised for integration into the composite building structure. The novel hinge means comprises a base plate disposed in a vertical plane perpendicular to the wall panel plane and having one leg bolted against the face of a wall panel stud and a transverse leg pivotally connected to a roof panel beam element at an elevated position spaced inwardly from the outer lower edge of the roof panel. In addition, a third leg perpendicular to the plane of the base plate is bolted against the face of a roof panel plate to reinforce the wall panel corner. Two or more such connecting hinges at opposite ends of the roof panel or at intervals along its length section provide the connecting hinge support for each wall panel in a length section module of the structure being erected.