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Founded in 1975, Chelsea Building Products are a leading manufacturer of extruded building products in the United States. Specializing in the design and manufacture PVC and composite windows and doors, moldings, flooring, exterior wall cladding, shutters, and custom profile. Chelsea’s products can be found in millions of American homes. Chelsea Building Products sources all its materials domestically and compounds its products in-house. Chelsea combines inorganic minerals, polymer resins, and acrylic colorants to produce durable, strong, and safe cellular PVC. With headquarters in Oakmont, Pennsylvania, Chelsea Building Products became a subsidiary of Aluplast GmbH in 2017.


Chelsea Building Products introduced its Everlast advanced composite siding and trim line in 2009, and these specially formulated extruded planks have since become a favorite alternative to fiber cement and wood. Because Everlast seams are butt joined and do not overlap (like vinyl siding), their appearance is much closer to traditional building materials. But unlike cedar, Everlast is UV, water, and insect resistant, and is guaranteed to never swell, bow, rot, expand, or contract. Additionally, Everlast does not ever need to be painted or caulked, and will shine with its original luster after only light washing. Everlast is made from a proprietary mixture of polymeric resin and granular stone. As they contain no wood, Everlast boards and trim will never have to be replaced because of weather damage. Plus, Everlast’s best-in-category limited warranty protects against excessive color change, peeling, flaking, cracking, rusting, blistering, and corroding.