When Should You Replace Your Windows? A typical home window lasts 15 to 20 years. Once the seals reach this age, they deteriorate or fail, leaving you vulnerable to breezes and water seepage. In addition, windows with a single pane were the norm fifteen or more years ago.
Most windows that receive direct sunlight fail more frequently. Heat causes window units to expand and contract, thereby deteriorating window seals. It softens and deteriorates the seals until they develop a fissure that allows moisture to enter or until the sealant seeps away.
Fibreglass frames are the most durable and long-lasting, lasting between 30 and 40 years. Even with the most durable windows, you must still monitor the seals and consider how the glass will age.