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How to Replace a Lock on a UPVC Door in Five Minutes It is a simple and affordable project to replace the lock on your Upvc door. It can be done in five minutes. This is an excellent option to enhance the security of your home, whether you are changing a lock after an attack, or just want to improve security. 1. Remove the old lock The first step to change the lock on doors made of upvc is to remove the lock that was previously in use. may seem difficult initially, but with a little preparation, you ca