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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 just five minutes. This is a great option to enhance the security of your home, whether you are replacing a lock following an incident of burglary, or simply want to add more security. 1. Take off the lock that was previously used. To change the lock on a door made of Upvc, you must first take off the old lock. It may seem difficult at first, however with