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Builders FirstSource is a supplier of structural building products and value-added components for the professional residential construction market. Its catalog covers lumber, trusses, engineered wood, windows, doors, siding, roofing and cabinets, and it also offers custom millwork and truss and engineered wood design. Builders, remodelers and contractors make up its core customers.

Contractors can request a quote through an online form that asks for project type, job site location and a materials list. The company runs showrooms and design centers, offers drafting and installed services, and lists delivery and pickup along with dedicated support for larger accounts. Its headquarters is in Irving, Texas, and it has locations across many states.