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How to Change a UPVC Door Lock

This article is a collaborative effort, crafted and edited by a team of dedicated professionals.

Contributors: Muhammad Baballe Ahmad, Mehmet Cavas, Sudhir Chitnis, and Zhen-ya Liu.

✓ Verified & Tested Information

Don’t be locked out of your own home! Learn how to change a UPVC door lock with our easy-to-follow guide.


Before you start the process of changing a UPVC door lock it is important to prepare for the job. Gather the necessary tools such as the new door lock and screwdriver and ensure you have enough space to work in. It is also important to ensure that the door is in the open position and that you have a stable surface to work on. Once you have these key points covered then you are ready to start to change the UPVC door lock.

Gather the right tools

Gathering the right tools for the job is an important first step in changing a UPVC door lock. The most common Tools you will need are a screwdriver, an adjustable spanner (spanner with aggressive ends), a box of screws and a wax pencil. Additionally, you may need to purchase new screws or even sandpaper if the old screws are rusty or corroded.

You should also put aside some time to measure up the new lock, which may require some extra tools such as a ruler or meter stick and possibly a replacement latch or handle to make sure it fits properly. With these items in hand, you’re ready to begin changing your UPVC lock.

Understand the lock mechanism

Before we can start, it is important to understand how the lock mechanism works. In brief, the UPVC door handle moves a small key-operated cam in the door cylinder. This moves across multiple sets of pins that must be at different heights and then into a locking position. To open the door, this needs to be perfectly aligned and the pins dropped so that they match up with the cutouts in the side of the key.

When attempting to change your UPVC lock, always make sure you have examined it to work out which style it is. Most locks will require an allen key (or hex tool) while some more modern varieties may require a screwdriver such as a torx – take care not to damage any seals when opening these locks, as this can invalidate any warranty you may have!

You will also need some lubricant for your replacement lock – most come with their own suggested lubricant but white lithium grease is generally considered suitable for most UPVC locking mechanisms. Ensure you apply liberally during any adjustments or repairs you carry out when fitting or changing your lock.

Removal of the Old Lock

Removing the old UPVC door lock is a fairly simple task. First, you will need to remove the screws at the top of the door and at the side of the door. Once the screws have been removed, you can then gently pull the lock away from the door. Care must be taken not to damage the door frame, as this can affect the installation of the new lock.

Remove the screws from the old lock

In order to remove the existing lock, you will need to locate and unscrew the two fixing screws that hold it into the routered frame. Depending on the type of door and lock you have in place, there may be hidden screws or additional fixings that need to be disconnected. Once all of these screws are removed, your existing lock should come away from the UPVC door easily.

If this is not the case, additional force may be required but it is important to take care as excessive force can cause damage to your UPVC door or frame. Make sure that a suitable screwdriver is used during removal to minimise any damage caused during that process. If a more direct approach is needed for stubborn locks then it may be worth consulting a professional locksmith for advice on how best to remove them in those situations.

Remove the old lock from the door

Once you’ve marked your new lock, it’s time to remove the old one. Before beginning this step, it is important to make sure that the door is unlocked and you have removed any necessary screws or catches. Take a look at the internal workings of the old lock to determine how they are connected to the door frame – these might include screws, brackets and spacers. On some models of UPVC doors, there may be additional components such as metal rods running between spindles or winders.

Be careful not to pull too hard when disconnecting old locks from these components as some metal parts may still be delicate after years of use. Once everything has been disconnected, remove the screws securing the lock into place – normally located within grooves on either edge of the outside faceplate – then lift off the entire unit in one piece. Be sure to dispose of this lock in an environmentally safe way if required by your local municipality regulations.

Installation of the New Lock

Installing a new door lock to your UPVC door can be a simple and stress-free task. The first step is to ensure the size of the lock is appropriate for the door. After this, you can prepare the new lock by attaching the latch and bolt to the plate. This will provide you with the correct lever action within the door itself. The next step is to begin the installation.

Place the new lock into the door

Before changing a UPVC door lock, it is important to confirm the size of the replacement lock and purchase one accordingly. Once the appropriate lock has been purchased, the first step in replacing it is to place the new lock into the door. Care should be taken to ensure that the new lock is inserted at exactly right angles into the recess as done with other types of locks. Make sure that all components of the new lock fit snugly and evenly with no gaps around its sides or along its length. Additionally, check that all nuts and bolts used during installation are properly tightened. After positioning and fitting together each component, lightly lubricate them with some machine oil or WD-40 spray for smoother functioning. It is also recommended to apply an image of tape on exterior parts of new UPVC door locks for added protection against weathering and wear and tear over a period of time.

Reattach the screws to secure the new lock

Attach the screws to the new lock before you reinstall it. Make sure to use manufactured screws which are intended for this purpose and not just any screws you might have lying around in your toolbox. Manufactured screws are specifically designed for UPVC doors, so it’s important that you use the correct type to ensure the new lock is secure.

Reinserting a lock back into a door can be tricky as there is often a very exact procedure required. A typical UPVC door has two retaining holes on one side, and these must be aligned correctly with the holes within the lock case before beginning the re-installation process.
You should begin by attaching both screwdriver bits of your screwdriver into their respective recessed screws within the locking faceplate. Use a hammer or another soft-faced implement to gently tap them into place until flush with the locking plate – but apply careful pressure so that you don’t damage either of the pieces during installation.

Once both of these screwdrivers are in place, take care to ensure that they fit snugly into their screw holes by firmly pressing down on each bit until they are both in place. After this point, carefully push down on the new lock whilst holding onto it securely – ensuring that all 4 retaining points (2 per side) fit properly into their corresponding places across the door panel and latch plate before moving onto attaching any additional screws or bolts required for security purposes if applicable. Then, start at one corner and work your way around, carefully replacing each screw before doing another couple of turns in order to fully secure them all in place
The final step is to attach any additional features such as handles or key turners (if applicable). Before doing so however make sure that everything is aligned properly with no issues existing such as misalignment issues or obstructions preventing smooth functioning – attend to these issues if necessary prior to using fixings such as bolts or nuts etc securing them tightly together once everything looks ok from an aesthetic and functional standpoint!

Test the lock before you finish

Before you finish the installation process, it is essential to test the new lock. This will help you determine whether or not the lock is functioning correctly. Start by testing how well the toggle and handle mechanism work together to open and close the door securely. Then, press in the tongue of the lock to see if it engages properly when pushed into place. You should also check that all of the screws are secured tightly and that no screws have been omitted during assembly. Additionally, make sure that each component inside of your UPVC door is lined up correctly and that everything operates without fail before you finish your installation.

Finishing Up

Changing a UPVC Door Lock is not hard at all if you follow the proper steps. Once you have the lock installed, it is important to make sure that it is properly secured and functioning. The finishing up process is essential in order to ensure the security of your property. It involves tightening the screws and adjusting the latch to make sure it is properly aligned. Let’s take a closer look at how to finish up the lock change process.

Test the lock again

Before you finish, you should always double-check the functionality of your new lock. Open and close the door from both sides and make sure the key is easy to turn. Additionally, make sure the bolt is correctly engaged and that all screws have been properly tightened.

Now that your UPVC door lock has been swapped out, you can feel secure knowing that you have successfully improved the security of your home. Make sure to keep all keys in a safe spot in case of emergency – it’s always handy to have a spare set!

Clean up any mess

Once you have completed the installation of your new door lock, it is important to take some time for clean-up and finishing touches. Carefully sweep up any dust or debris left over from your work, and make sure all tools used are returned to their proper storage areas. If there were screws used to secure the strike plate or latchbolt, make sure they have been tightened securely.

Finally, replace the door jamb cover but do not tighten it completely until you have tested the new lock first. With the cover loosened slightly, close the door and turn the key to make sure there is no binding or rubbing of surfaces. After verifying everything works properly, then go ahead and tighten down all screws securely. A correctly installed lock should provide you with years of quality service.

Double check the lock is secure

After you have installed the new lock, it is important to check that the locking mechanism functions properly. Be sure to double check that the locks’ components are secure and that all pieces are in place. Additionally, when turning the key in the lock, pay attention and make sure it engages correctly.

Finally, examine how securely the latch bolts go into their sockets on either side of the door frame – you want them to be flush against each side of frame for a snug fit. If it does not seem to fit as tightly as it should, then you may need to adjust or install strike plates with longer latch bolts accordingly.

How to Change a UPVC Door LockCheckout this video:

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