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How to Replace a UPVC Door Replacement Lock If your door lock jams or doesn't work as it should, you might be looking to replace it. The process might seem complicated but it's actually straightforward and doesn't require an expert locksmith. A few basic tools, some patience and lots of care will suffice. Here's how to do it: Measure the Door It could be time to replace your uPVC doors if you are having difficulty locking them or if they don't close. If you've just moved into a new home, a tenant moved ou