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How to Replace a Lock on a UPVC Door in Five Minutes It's a simple and affordable project to replace the lock on your Upvc door. It can be completed in five minutes. If you're looking to replace a lock after a break-in or just want to add extra security this is a great option to improve the safety of your home. 1. Take off the lock that was previously used. The first step to change a lock on upvc doors is to take off the old lock. It might seem daunting at first, however with some preparation y