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How to Replace a Door Lock on a UPVC Door

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

Have you recently moved home or had a break-in? If so, then it’s probably a good idea to change the locks on your doors. In this blog post, we’ll show you how to replace a door lock on a UPVC door.


Replacing a door lock can be a daunting task, but with the right preparation and tools, it can be a simple and straightforward job. Before beginning the process of replacing the lock, it is important to ensure that you have all of the necessary materials and tools. This includes a new door lock of the same size and style as the current one, a drill, and a screwdriver. Additionally, you need to know the exact measurements of the old lock, as well as the diameter and length of the screws. With all of the necessary materials, you can begin the process of replacing the lock.

Gather the necessary tools and materials

Before attempting to replace the door lock, it is important to Identify the type of lock and gather all of the necessary tools and materials. This may require a trip to a hardware store. The following list outlines what will be necessary for this project:
-Tape measure
-Pencil or marker
-Replacement Lock (fits the hole size of the existing lock)
-Drill with appropriate drill bits
In addition to these tools and materials, you may also want to pick up any other supplies such as new screws or additional latch pieces that may be included with your new lock. Make sure that your replacement lock properly fits into the hole size of the existing door before purchasing it. Additionally, consider any additional latching needs that you may have so you can make sure your new replacement is compatible with those features. With all the needed materials identified and gathered, you will be ready to begin replacing your UPVC door lock.

Measure the door and the lock

Before you begin the process of replacing a door lock on a UPVC door, it is important to determine the size and type of lock that is required. You will need to measure the depth from the internal edge of the door to the centre of the existing lock, then measure its width from side-to side. This will help you find an appropriate replacement for your UPVC door that is similar in size and style. It is also important to check if there are any extra fittings or accessories which are needed for installation such as screws, rods or spindles. Once you have determined the size of your new lock, you can begin to select one that is suited to your needs and tastes.

Removal of Existing Lock

Removing the existing door lock on a UPVC door is a relatively simple process. The first step is to remove the screws that are holding the door handle in place. Once these screws have been removed, the door handle will come off along with the lock mechanism. Once this is done, the old lock can be carefully pulled off the door.

Remove the screws from the outside of the door

Before beginning, make sure to gather the necessary tools. The most common door locks use either a Phillips or a flathead screwdriver. To start, a Phillips screwdriver is needed to remove the outside screws on the handle and latch of the old plastic UPVC door lock. The screws should be removed one at a time and placed aside in a safe spot where they will not be mixed with other screws or lost during the process. Depending on the specific lock model, there may also be some countersunk screws located inside the hand grip that need to be removed as well. Be careful not to allow any parts of the lock mechanism to fall into the door and get lodged in between two layers of UPVC when removing screws from these areas. Once all outside screws have been removed, carefully lift off both handles from their housing and set them aside for later use.

Remove the screws from the inside of the door

Remove the screws from the inside of the door using a screwdriver. To gain access to the screws, you will need to open the door and remove any furniture that is blocking its way. Make sure that you use the correct size screwdriver for your type of screws. Gently pull on the lock mechanism until it comes loose. Hold onto it while unscrewing any remaining screws securing it in place. Store these and all other parts of the existing lock in a safe place, as they may be needed later when installing a new lock.

Remove the lock from the door

Before you can replace your existing lock, you must first remove it from the door. This process involves using a screwdriver to remove the screws that secure the lock to the door frame. Start by unscrewing the top and bottom screws that are located on either side of the handle plate in line with the cylinder. Make sure to keep track of where each screw goes as different size screws may be required when replacing your lock.

Once all of the screws have been removed, you should be able to slide out the cylinder and spindle bar from its place in the door frame. You may need to use some force if these parts are stuck due to rust or wear and tear over time. Take care not to scratch or damage any surrounding material while removing these components.

In some cases, it may also be necessary to remove any fixings that hold other parts of the lock such as its latch or deadbolt in place within your door frame – such as any additional security locking screws hidden behind a plastic cap at one side of your cylinder housing unit. At this stage you will be ready to replace your existing lock with a new one – ensuring that all parts fit securely back into place before securing them with appropriate sized screws and fixings.

Installation of New Lock

Installing a new lock on a UPVC door may seem like a daunting task, but it can actually be quite simple. With the right tools and knowledge, you can be well on your way to replacing a door lock in no time. This section will give you a step-by-step guide on how to replace a door lock on a UPVC door. From the necessary tools to properly fitting the lock, this guide will help you through the entire installation process.

Place the new lock in the door

To begin the process, place the new lock into the door hole and make sure it is in its locked position. If the lock has an encaspulatement, remove this carefully. Take care of any screws or fittings and remove them separately. If your lock requires a handle adapter plate, line it up to the holes in the door and secure with screws, taking care not to overtighten.

Next, align the steel spindle bar from your old lock into the hole at the base of your new lock – do this by lightly tapping it into place with a light mallet or hammer until it is firmly secured. To ensure that all screws are tightened securely and safely insert a power drill or screwdriver to finish up this step. Finally, fit any accessories such as keeping plates or strike boxes onto each side of the door frame depending on your fitting instructions which may come with the new lock.

Secure the lock to the door with screws

Once the faceplate is aligned correctly and held in place, it’s time to secure the lock to the door using screws. Start by using a drill or screwdriver to screw two of the long screws through the middle of each side of the faceplate into frame. Then insert the short screws into their respective positions at each top corner and bottom corner of the faceplate, and securely fasten them. The screws need to be tight so that your lock is held firmly in place on your UPVC door.

Place the outside cover over the lock

Once the new lock is in place, the next step is to position the outside cover over the lock. The outside cover has been specifically designed to fit around the bolt and lock mechanism so that it sits flush against the door and can’t be manipulated by anyone on the outside.

To place it, insert it over the mechanism first and then push gently so that it slips into its housing. Once this is done, screw in each of its pre-drilled holes into their respective holes along either side of the lock. Some screws may already be provided with your new door lock while others need to be purchased separately. Tighten up these screws as much as possible but donot over tighten as this can cause damage to your UPVC door or damage to your replacement lock.

Lastly, slide in any bolts or cam arcs if necessary before repeating this process on the inside of your door for a fully completed installation.

Finishing Touches

To finish off your door lock replacement, it’s important to check that your new door lock has been fitted properly and is secure. The first step is to check that the lock operates smoothly and that the latch closes and opens properly. Then, you should look for any excess glue or sealant around the lock that needs to be removed. Finally, make sure that the key is properly aligned and works correctly when you attempt to lock and unlock the door.

Test the lock to make sure it works

Once your lock is in place, you should test it to make sure that it works properly. Start by placing the key in the lock and turning it until the handle has turned all the way. Then try pulling on the latch or sliding back and forth the drawbar (if your UPVC door has one) to check if it opens. If not, then try moving the key slowly back and forth slightly while continuing to turn until you hear a click sound. Depending on how secure you wish your door to be, you can then vary the amount of pressure used when closing and locking.

Finally, you may want to replace some of or all of your screws with tamper proof screws for optimal security; these are easily available from most hardware stores. Make sure that you use long enough screws so that they go into stable surfaces such as wall studs if necessary – avoid utilizing dry wall anchors as they will not hold up against forceful attempts at entry. Once done, test once more to make sure everything works properly before enjoying a safe and secure home without needing any lockout services!

Fit the door handle

Now that the new lock is installed, it’s time to get the door handle ready. Place the top section of the door handle back into its hole in the door, ensuring that it’s put in the correct way round. Once it’s positioned, simply tighten up its two screws using your Phillips screwdriver.

Next, take your spindle and attach one end to your outside handle and the other end into its hole at the top of your inside mortice lock. Tighten up its grub screws with your Phillips screwdriver or Allen key depending on which type you have purchased. Make sure not to over-tighten them as this could cause problems when you come to close and open your door!

Attach the long faceplate part onto both handles, making sure that they are flush with each other. Now firmly secure both faceplates with their three screws (one at each side and one at the bottom). You may need someone to hold either side of the handles while you tighten their screws to ensure that they do not move while you are securing them.

Finally take a look around all parts and make sure everything is tight and secure before testing out how well your new lock works!

Test the door handle to make sure it works

Once the new lock has been successfully installed, it is now important to test it to make sure that it correctly functions as a security device. Make sure that the handle and lock mechanism are securely in place, and that the key is able to open the door from both sides. Operate the door handle several times in order to test how well the entire device moves and operates. If you find any issues with your new lock, contact an expert in door security before installing a new unit. Carefully inspect all components to ensure nothing is damaged or misaligned, as this could compromise your home’s security. Additionally, make sure there are no loose screws or brackets making contact with one another; if so, use a screwdriver to properly tighten them into place.

How to Replace a Door Lock on a UPVC DoorCheckout this video:

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