Chelsea Building Products, Inc.
Wholesale Building MaterialsPennsylvania, United States51-200 Employees
Chelsea Building Products designs and manufactures extruded PVC profiles used in windows, doors, mouldings, Everlast siding, shutters, and custom profiles. The company traces its roots to 1975 when an extrusion operation opened east of Pittsburgh, introducing the first all-vinyl, double-hung tilt window system in the United States. It is based in Oakmont, Pennsylvania, and operates as a mid-sized supplier in the wholesale building materials industry. Its business model centers on collaborating with dozens of manufacturers to design and produce extruded profiles for a broad range of building products, including windows, doors, cladding, and trim. The Oakmont facility operates multiple extrusion lines around the clock, yielding millions of feet of profiles annually. In 2025 the company announced expansion of its footprint with a new manufacturing hub in Westmoreland County.