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How to Replace a Door Lock on a Sliding Glass 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

How to Replace a Door Lock on a Sliding Glass Door – Many people choose sliding glass doors for their homes because they are easy to open and close and provide a great view.


Before replacing a door lock on a sliding glass door, you will need to do some preparation. First, you will need to make sure that you have all the necessary supplies, such as a flathead screwdriver, a Phillips-head screwdriver, a hammer, a tape measure, and a replacement door lock. You should also make sure that you understand the basic steps for replacing a door lock, such as how to remove the old lock, install the new lock, and adjust the fit of the new lock. Once you have all the supplies and you understand the steps, you can begin to prepare for replacing your door lock.

Gather the necessary tools

Before beginning the process of replacing a door lock on a sliding glass door, it is essential to gather the necessary tools. This will allow you to finish the job in a shorter amount of time with fewer interruptions and minimal frustration. Some tools that may be needed include:

-A Phillips-head screwdriver
-A flat-head screwdriver
-A drill and appropriate drill bits
-An adjustable wrench to remove old screws
-Gloves for protection
-Bits of raw wood or small pieces of metal for shimming the new lock into place, if necessary
It is also important to ensure that you have all of the necessary replacement parts for your new lock as well as any additional screws that may be required. Depending on the type of lock you are installing, you may also need some washers or nuts. Having all of these items on hand before starting will make replacing your door lock a much simpler task.

Take measurements of the door

Before you purchase your new door lock, you need to take actual measurements of the door. Measure the width of the track for an accurate fit and make sure to measure from both ends. Then, take a look at where the old lock was placed in relation to the handle and make sure to get a lock with similar placement. It is important that you buy a lock that will fit securely in both height and width – this will serve as additional protection in keeping your door secure. Lastly, take note of any decorative elements now present on the door, such as etched glass or antique carvings, as they can impede installation if they aren’t taken into consideration before making a purchase.

Removal of the Old Lock

Replacing a door lock on a sliding glass door requires some knowledge of tools and the door itself. You will need some basic tools such as a screwdriver, a hammer, and a pair of pliers. Before you begin, you will need to remove the old lock from the door. This can be done by carefully removing the screws and other components from the door. Once you have removed all the necessary components, you can move on to installing the new lock.

Unscrew the old lock

Before you can begin replacing the old door lock on your sliding glass door, you must first remove the old unit. To do this, start by unscrewing the two screws that hold the lock in place. With a regular Phillips screwdriver, loosen both screws until they can be removed easily. Once all of the screws are out, you can take out the old unit by carefully prying it off with a flat-headed screwdriver. Be sure to remove any remaining screws or pieces that were used to keep the lock in place before you proceed to the next step of installing your new locking mechanism.

Remove the old lock

Removing the old lock is the first step towards replacing it. This process should be done carefully. Make sure to wear safety goggles and work gloves to protect your hands from any sharp edges or splinters.

Begin by removing any screws that are securing the lock to the sliding glass door frame. Insert a flat head screwdriver into the gap of the existing lock, if any, and wiggle it around until loose. Make sure not to expand or remove any screws that are holding together other parts of the door – these should not be altered in any way. If you cannot remove these screws with a flat head, use pliers and/or needlenose pliers to loosen them further.

Once all of the screws have been removed, carefully pull out the lock assembly from its place in the glass door frame and set it aside in a secure location so as not to further damage it or injure yourself accidentally while replacing it with its new counterpart.

Installation of the New Lock

Replacing a door lock on a sliding glass door can be a bit tricky and time consuming, but if you take your time and follow the instructions carefully, it’s a project you can complete on your own. The installation of the new lock is the most important part of the process and involves removing the existing lock, measuring the space for the new lock, drilling mounting holes, and finally, attaching the new lock.

Place the new lock in the door

Once you have the door prepared and the old lock removed, you’re ready to place the new lock in the door. Begin by carefully aligning the inner locking latch housing in place. Once aligned, use a drill to drive two screws into the door frame to attach it.

Next, insert both of the exterior screws that came with your new lock into the screw slots located on either side of the inner locking latch housing. Using a drill and proper screwdriver bit, securely drive these screws until they are flush with inside face of the housing.

Insert each of your remaining outside screws through each of their respective screw slots located on either side of outer lock housing, making sure that each is centered in its slot. Then, while securely holding your backplate against your door frame, use a drill and appropriate bit to drive these flush as well. You should now have all 6 screws in place – two on each side of both inner and outer housings.

Finally, line up your new knob or handle set with its respective opening located at top of outside lock housing-ensuring it is properly centered-and use appropriate screws and a drill to tightly fasten it in place. As always take special care when using tools, observe all precautions for using power tools safely; wear safety glasses if necessary throughout installation process. Once complete you should now have a functional and secure one-latch locking system for your sliding glass door!

Secure the new lock with screws

To complete the installation of the new lock, secure it in place by using screws provided. Most sliding glass door locks are held in place by one or two screws, fitted through the main mounting bracket over the door frame and into the lock body. Make sure to use a good-quality screwdriver, preferably with a magnetic hex tip to ensure that these screws are properly installed and tightened. Care must be taken not to overtighten these screws as this may break or damage the manually operated parts of the lock. Ensure that there is no excess force when tightening these screws so that all parts function smoothly and evenly when used. Then test out your new lock to make sure it functions properly, inserting and removing your key several times.

Finishing Touches

Once you have installed your new lock on the sliding glass door, you should make sure that it looks great. This includes taking the time to paint the frame to match the other door frames in your home. You should also check that the latch and slide mechanisms are working properly. After finishing all the touches and checking the mechanisms, you can enjoy the security of the new lock and the beauty of the sliding glass door.

Test the new lock

Once the old lock has been removed, you can place the new one onto the door and begin testing it for accuracy. Start by closing your sliding glass door and then attempting to lock it using the new key or knob. Verify that the latch is engaging by attempting to open the sliding door. Once this is confirmed, check to make sure that unlocking your new lock also causes the latch to disengage. If these tests are successful, you can proceed and finish installing your sliding glass door lock.

Before reattaching any screws or brackets, be sure that the entire circumference of your lock is lined up properly with the hole in your door. To ensure a consistent, snug fit, use a screwdriver or Allen wrench to carefully tighten all screws holding your new lock in place. To keep out moisture or dirt in between uses of the sliding glass door, using weather stripping tape along where gaps may exist would be advisable. Once you have completed these steps, you have successfully replaced a lock on a sliding glass door

Make necessary adjustments

You’ll need to make sure you’ve installed the lock properly before moving on to the finishing touches. Make sure it slides together smoothly, and that both portions fit together in a flush manner. If they don’t line up, adjust by using an Allen wrench on each side of the mounting holes. Next, you’ll need to make sure the screws are tightened firmly but not too tightly. You can use a screwdriver to give them an extra snug turn; just be careful not to overtighten them.

Finally, adjust the strike so that when the latch is inserted into the striker plate it does not bind when it closes shut. Loosen or tighten mounting screws as necessary until proper operation is achieved. Some locks may also require finetuning adjustments such as tension springs and more sophisticated systems with unlocking keys or pins may need minor adjustments after installation is complete as well.

How to Replace a Door Lock on a Sliding Glass DoorCheckout this video:

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