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Best Way to Change a Barrel Lock on a uPVC Door

Understanding uPVC Door Locks

uPVC doors, known for their thermal efficiency and security, are a popular choice for modern homes. They are low maintenance and resist fading or discolouring. For enhanced security, a barrel lock, specifically designed for uPVC doors, with a high security rating can be a great addition.


Essential Tools for Changing a Barrel Lock

  • A standard screwdriver
  • A replacement door barrel
  • A set of new keys for the new lock


Steps to Change the Barrel Lock

1. Prepare the Door: Ensure the door is stable and accessible from both sides by using door stoppers.

2. Remove the Door Handle: Use a Phillips-head screwdriver to loosen the screws on the inside of the door handle. Carefully remove the handle, taking care not to lose any small parts or damage the handle.

3. Access and Remove the Old Barrel: Locate and unscrew the barrel lock screw, then gently pull out the old barrel using the original key.

4. Install the New Barrel: Insert the new barrel with the new key and align it correctly before screwing it into place.

5. Reattach the Handle: Place the spindle back into the handle socket and reattach the handle to the door, ensuring it’s secure but not overtightened.


Tips to Prevent Common Issues

  • Avoid forcing the key into or out of the lock to prevent breaking the key inside the lock.
  • Be cautious not to strip the screw head or cross-thread the screws, which could make future removal difficult.
  • Take your time and follow each step carefully to avoid damaging the lock or door handle.
  • In case of any damage or difficulty, contact a professional locksmith immediately for assistance.



Changing a barrel lock on a uPVC door is a straightforward task that can be done in about five minutes. However, it’s crucial to follow each step carefully and avoid common pitfalls. For those who prefer professional assistance, SMS Locksmiths is always available to ensure the job is done efficiently and safely.

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