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How to Replace a Lock on a UPVC Door in Five Minutes The lock you put on your door made of upvc is an easy and inexpensive project that can be completed in less than five minutes. This is an excellent option to enhance the security of your home, whether replacing a lock following a break-in, or simply want to improve security. 1. Take off the lock that was previously used. The first step to change the lock on doors made of upvc is to remove the lock that was previously in use. It might seem daunting initia