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When to Call in a Professional for Window Hinge Repairs Window hinges are crucial for energy efficiency and for home security. They stop accidental window sagging and allow for easy opening. Keep your window hinges clean and lubricated. This will prolong their lifespan and performance. The hinges of any uPVC window or aluminium windows are vital. However, they can get damaged or worn over time. Damage Window hinges are what allow windows to open and close and when they begin to exhibit signs of wear or damage