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How to Replace a Lock on a UPVC Door in Five Minutes Switching the lock on your door made of upvc is an easy and cost-effective project that can be completed in less than five minutes. This is an excellent option to increase the security of your home, whether you are changing a lock after an incident of burglary, or simply want to improve security. 1. Remove the lock from the old one. To change a lock on a door made of upvc first, you need to remove the old one. This can be a daunting task initiall