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How to Replace a Lock on a UPVC Door in Five Minutes It's an easy and affordable project to replace the lock on your Upvc door. It can be done in just five minutes. Whether you need to replace locks after a burglary or just want to provide extra security, this is a great option to increase the security of your home. 1. Remove the old lock To change the lock on an upvc door it is necessary to first take off the old lock. This can be a daunting task initially, but with a bit of preparation it's simple to