Double glazing can last for decades. The general consensus on the lifespan of double glazing is estimated to be around 25 years, but this comes down to the external environment as well as the amount of care you take for your double glazing. Double glazing really refers to the glazed glass unit found within the window frame, although in recent years the term has become widely used to refer to complete window units. Double glazed windows installed in areas with harsh weather conditions will likely need replacing before windows that have been installed in a sheltered locality.

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