If you develop, manufacture or distribute building products using extruded vinyl profiles, cellular foam, PVC compound or composite materials, then you probably know Chelsea Building Products. Since 1975, Chelsea has pioneered the design and manufacture of meticulously engineered extruded profiles used in PVC and composite windows and doors, cellular mouldings, and reinforcement; plus Everlast composite siding, shutters, custom profiles and more. From raw material to profile design, production line development to finished product, Chelsea has the proven capability you need to develop improved, efficient, cost-effective products.