This depends on the film type, glass type, window construction, orientation and geographical location of the building. Most residential and automotive applications are covered by a lifetime warranty as long as you own the house or car. Most commercial installations receive either a 10 or 15 year warranty. There are some specialty films that have different terms; for example exterior films are warranted for 5 years on vertical glass, 2 years on sloped glass; decorative films usually have 7 year coverage.