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How to Replace a UPVC Door Replacement Lock If your door lock starts getting stuck or doesn't function as it should, it's time to look into replacing it. The process might seem complicated but it's actually straightforward and doesn't require the services of a locksmith. A few basic tools, a bit of patience, and a lot of attention should suffice. Here's how to do it: Take a measurement of the door It could be time to replace your uPVC doors if they are having difficulty locking them or if they don't close