Change uPVC Door Lock
Do you need to change a uPVC Door Cylinder? Read our guide below on how a Locksmith would change a lock on a uPVC door and why you should call out the experts!
At Keytek® Locksmiths, we understand the importance of maintaining a secure home. If you’re looking to enhance your uPVC door security, one of the best ways to do it is to change uPVC door lock. In this comprehensive guide we’ll provide you with step-by-step instructions on how to change door lock on uPVC door effectively.
How To Change Door Lock on a uPVC Door?
Unless you have locksmith or carpentry experience, we’d strongly suggest that you contact a locksmith for a uPVC lock replacement. However, if you want to know the steps a locksmith would take, they would:
1. Remove the Old uPVC Lock
The Locksmith will use a screwdriver to unscrew the screws of the old cylinder and remove it.
2. Measure the Lock
Measurements are crucial to ensuring a proper fit when trying to change door lock on uPVC door. A Locksmith will take 2 main measurements, the distance between the centre line of the lock to the external keyway and the distance between the centre line of the lock and the internal keyway or thumb-turn.
3. Find the Replacement uPVC Door Lock
This is when calling out a locksmith is handy, they should have all parts needed on board to replace the uPVC door lock there and then. However, uPVC door locks can easily be ordered online through trusted suppliers.
At this point you can also consider the level of security you require before selecting a new uPVC door lock. Ask for locks that meet British Standards to ensure you are getting a lock that has met the highest security standards. Choose models that provide high-security features like anti-snap, anti-pick, and anti-drill protection.
Keytek® Locksmiths offers a wide range of uPVC door locks to suit various security needs.
4. Remove the Old uPVC Lock
With the replacement uPVC lock identified, the old uPVC lock can be removed with a screwdriver.
5. Replace the uPVC Door Lock
A Locksmith would then insert the new uPVC door lock. They will make sure it aligns correctly with the door frame. It should fit into the designated slot. Ensuring that the lock sits flush, is secure, and is working correctly.

Cost to Change Door Lock on uPVC Door
Cost to change a door lock on a uPVC door can start from £125, and range upwards depending on size, make and model. Locksmith prices vary from locksmith to locksmith and location. The cost to change a door lock can vary depending on the size, make, and model:
- uPVC Standard Cylinder Replacement: Starting from £125.
- uPVC High Security Cylinder Replacement: Starting from £150.
- uPVC Multi-Point Locking Mechanism: Starting from £220.
How to Know If a uPVC Door Lock is Fitted Correctly
A uPVC door lock should sit flush inside the handle of the uPVC door on both sides. In the images below you can see that the euro cylinder is flush with the handle and fits tightly. If there is a significant overhang of the cylinder, where it is too long, then you could be at risk of cylinder snapping.

uPVC Lock Replacement
You get can a replacement uPVC door lock or composite door locks to upgrade your home security. To change door lock on uPVC door is a practical solution for increasing security. This applies whether you are moving into a new property or want to enhance your existing security.
By choosing a reputable Locksmith service like Keytek®, you can have confidence in the quality and reliability of the new lock.
Keytek® Locksmiths offers services from professional uPVC specialists who can change door lock on uPVC door, to ensure the utmost security for your home. Read on to discover the answers to commonly asked questions and gain valuable insights to change uPVC door lock.
uPVC Door Problems
If you are having problems with your uPVC door locking mechanism, visit our Fixing a Broken uPVC Door Mechanism guide.
If your uPVC door won’t open or uPVC window won’t open, read our Fixing a uPVC Door or Window That Won’t Open guide.
If you are having composite door problems, read through our Fixing Problems with Composite Doors guide for the best tips!
Frequently Asked Questions
Can You Replace the Lock on A uPVC Door?
Absolutely! You can replace the lock on a uPVC or Composite door to upgrade your home’s security. Changing the lock on a uPVC door is a practical solution for increasing security. This applies whether you are moving into a new property or want to enhance your existing security.
Can You Change the Cylinder on A Door Lock?
The cylinder, also known as the lock barrel, is an important part of the lock. This component on the side of the door allows you to turn the key, allowing it to unlock and lock. You can see this happening by looking at the side of the lock and checking that the mechanism is working.
How To Change a Lock on a uPVC Door Without a Key
If you need to change the lock cylinder on an uPVC door without keys, contact a professional locksmith. Only a locksmith or specialist can remove and replace the lock barrel if you don’t have the key.
How Do I Know What Size Barrel Lock I Need?
Measure the distance from the end of the cylinder barrel to the centre of the black line on each side. Do not measure the entire black line on one end or the other, as this would make the measurement too long.
What Is a Lock Barrel?
Barrels are the internal workings of a lock that house the tumblers and receive the key. The correct key must be inserted into the barrel. This aligns the tumblers, allowing the barrel to rotate and the lock to unlock.
How Much Does It Cost to Change a Lock on A UPVC Door?
- uPVC Standard Cylinder Replacement: Starting from £125
- uPVC High Security Cylinder Replacement: Starting from £150
- uPVC Multi-Point Locking Mechanism: Starting from £22