Excel Windows is a well established home improvement company located in Tinley Park, IL, and Glendale Heights, IL. Excel has been in business since 1977. We specialize in replacement windows, entry doors, acrylic walls, tub liners, tub to shower conversions & Walk-in Tubs, and siding. We have an A+ rating with the Better Business Bureau and have won many awards for outstanding customer service. Our goal is to ensure our customer's satisfaction before installation, during installation, and for as many years as they own their home.