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How to Replace a Composite Door Handle Door handles can make a huge difference to the aesthetic of your composite or UPVC door. Whether you're searching for stainless steel handles or a classic antique black the selection is there to fit any home. Changing your door handle is much simpler than you think. Follow these simple instructions and you'll have a new handle in no time. 1. Take a measurement of the door The first step to replacing a composite handle on a door is to determine its correct size.