Established in 1954, Alcor Incorporated is a home improvement company that serves the needs of individual and commercial clients throughout western Michigan. It offers installation and replacement services for windows, doors, and vinyl and aluminum siding. Alcor Incorporated provides three-season porches, shutters, metal roofs, storm windows and awnings in a range of sizes, textures and shapes. It is a member of the Home Builder s Association of the Holland Area and has creative workmen and installation professionals as its staff members. The company also offers cost estimation and professional consulting services, as well as custom screen rooms, patio covers and carport design. Alcor Incorporated is located in Jenison, Mich.