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How to Replace a Lock on a UPVC Door in Five Minutes It's an easy and inexpensive project to change the lock on your Upvc door. It can be accomplished within five minutes. This is a great option to increase the security of your home, whether you're replacing a lock in the aftermath of a break-in, or simply need to increase security. 1. Remove the lock from the old one. The first step in changing the lock on doors made of upvc is to remove the lock that was previously in use. This can be a daunting tas