Builders FirstSource, Inc. engages in the manufacture and supply of structural and related building products for residential new construction primarily in the southern and eastern United States. The company offers prefabricated components, including floor trusses, roof trusses, wall panels, stairs, and engineered wood; and window and door products, such as aluminum and vinyl windows, and pre-hung interior and exterior doors, as well as assembles and distributes interior and exterior door units. It also provides lumber and lumber sheet products comprising dimensional lumber, plywood, and oriented strand board products; millwork products, such as interior trim, exterior trim, columns, and posts, as well as provides custom exterior featured products; and other building products, including cabinets, gypsum, hardware, composite materials, roofing, and insulation. In addition, the company offers turn-key framing, shell construction, design assistance, and professional installation services, as well as provides a range of construction services. It serves customers ranging from production homebuilders to small custom homebuilders. The company was formerly known as BSL Holdings, Inc. and changed its name to Builders FirstSource, Inc. in October 1999. Builders FirstSource, Inc. was founded in 1998 and is based in Dallas, Texas.