General Info: Builders FirstSource of San Antonio serves homebuilders and provides a range of lumber, engineered wood and related building materials. It maintains a showroom that features windows of aluminum and vinyl. In addition, the company operates a lumber yard and various manufacturing facilities. Builders FirstSource of San Antonio offers custom millwork, windows, interior and exterior doors, wall panels, and roof and floor trusses. The company is a part of Builders FirstSource, which is one of the leading suppliers and manufacturers of structural and related building products in the southeastern United States. Builders FirstSource serves the residential construction industry and has more than 50 distribution centers and manufacturing facilities.