Renewal by Andersen is the window replacement subsidiary of Andersen Corporation, a company that has revolutionized the window and door business for more than 110 years. Drawing on the Andersen tradition of over 100 years of quality, innovation, and craftsmanship, Renewal by Andersen of Longmont, CO, was founded with the objective of creating a different and better window replacement and patio door installation experience for homeowners like you.