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How to Replace a Lock on a UPVC Door in Five Minutes It's a simple and inexpensive project to change the lock on your Upvc door. It can be done in five minutes. If you're looking to replace the lock following a burglary or simply want to add additional security it is a great method to improve the safety of your home. 1. Take off the lock that was previously used. To change the lock on a door made of upvc, you must first remove the old one. This can be a daunting task initially, but with a little preparation