Builders FirstSource is a supplier and manufacturer of building materials, manufactured components, and construction services to professional homebuilders, subcontractors, remodelers, and consumers. Its manufactured products include factory-built roof and floor trusses, wall panels and stairs, vinyl windows, custom millwork, and trim, as well as engineered wood. The company also assembles interior and exterior doors into pre-hung units. Its full range of construction-related services include professional installation, turn-key framing, and shell construction.