A high-quality skylight typically lasts between 15 and 30 years, depending on the materials used, the quality of the initial installation, and the regional climate conditions it endures. The glass panes and exterior frames are built to withstand decades of weather exposure, but the rubber gaskets, seals, and flashing components usually degrade much faster, often requiring minor maintenance or resealing every 8 to 12 years. If a skylight is exposed to extreme weather fluctuations, heavy snow loads, or intense ultraviolet radiation, its functional lifespan may lean toward the shorter end of that range. Homeowners should monitor their skylights closely as they approach the 20-year mark, looking for signs of fogging between double-paned glass, brittle seals, or recurring moisture issues, which indicate that the unit has reached the end of its reliable lifespan and requires professional replacement.
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