Builders FirstSource, Inc. manufactures and supplies structural and related building products for residential new construction principally in the southern and eastern United States. It offers prefabricated components, such as floor trusses, roof trusses, wall panels, stairs, and engineered wood; manufactures, assembles, and distributes windows; and assembles and distributes interior and exterior door units. The company also provides lumber and lumber sheet goods, including dimensional lumber, plywood, and oriented strand board products used in on-site house framing; millwork products, which comprise interior trim, exterior trim, columns, and posts; and other building products and services, including cabinets, gypsum, roofing, and insulation, as well as offers turn-key framing, shell construction, design assistance, and professional installation of products. It serves production homebuilders and custom homebuilders. The company was founded in 1998 as BSL Holdings, Inc. and changed its name to Builders FirstSource, Inc. in 1999. Builders FirstSource is based in Dallas, Texas.