How To Add A Lock To A Sliding Glass Door Without A Lock (LOCKiT! Picture Tutorial)

*My posts may contain affiliate links, which means I may receive a small commission, at no cost to you, if you make a purchase through a link! Thank you for supporting my website!*

Last updated on January 13th, 2023 at 01:54 pm

How To Lock A Sliding Door From The Inside

Wondering how you can add a lock to a sliding glass door that has a broken or missing handle lock? Well, look no further because I have your answer!

To lock a sliding glass door that is missing a lock from the inside, install a double-bolt sliding door lock. This sliding door lock prevents sliding doors from being opened horizontally or vertically making it the ideal lock to prevent burglary.

Now that we’ve got the basics out of the way, let’s break into the details further so you can easily secure your patio door with a new lock.

Let’s dive in!

Quick Navigation: How To Lock A Sliding Door Without A Lock

  1. Remove The Lock Cover With A Screwdriver
  2. Hold The Lock In Place On The Door & Mark The Door Frame With A Pencil
  3. Drill The Marked Holes In The Door Frame & Screw In Part Of The Lock
  4. Hold The Lock In Place On The Door Again & Mark The Door With A Pencil
  5. Drill The Marked Holes In The Door & Screw In The Other Part Of The Lock
  6. Snap The Lock Cover Back In Place & Use The Door
  7. Other FAQs About Sliding Door Locks
  8. Final Thoughts
  9. Related Door Articles

Level Of DifficultyTime To Complete
Easy20 Minutes
Material ListTool List
Contractor PencilLOCKiT! Double Bolt Sliding Lock
Drill With 1/8″ Drill Bit And Philips Head Bit
Philips Head Screwdriver
Flat Head Screwdriver

The product featured in this tutorial is the LOCKiT! Double Bolt Sliding Lock found at Lowe’s. We have a few rental properties that have sliding glass doors and over the years, the locks that come from the manufacturer wear out and break over time. (Especially when a tenant breaks the lock because they didn’t want to pay for a lockout fee… sigh.)

When I went to replace the sliding door handle, I could not find a handle that was an exact replacement. And I definitely did not want to pay for a full sliding door replacement. So that’s when I wandered across the LOCKiT! Sliding Lock.

It is an aftermarket sliding door lock that prevents the sliding door from being lifted with a crowbar and pulled off its tracks by a burglar. It also helps prevent small children from opening the door without permission and is an extra layer of security that you can’t get from the basic lock.

So far, we’ve installed 4 of these locks and have had a ton of success! I highly recommend this product to anyone who wants an extra layer of security on their patio door or needs an easy solution to replacing a broken sliding door lock.

Step One: Remove The Lock Cover With A Screwdriver

The first step to adding a lock to a sliding glass door is removing the lock cover with a screwdriver.

First, let’s decide the best place to install the double bolt lock. The most popular place to install the lock is halfway between the handle and the top of the door.

This positioning looks aesthetically pleasing, is convenient to use for adults and older children, and prevents smaller children from being able to open the door.

Here’s what our sliding door looked like before we installed the new lock. The existing lock had been broken at some point. Instead of trying to find a replacement lock, we wanted a secondary lock that added extra security. So we installed the LOCKiT! Double Bolt Lock.

Now, grab the lock and a screwdriver, and remove the cover on the lock to expose the screw holes.

Shove a flathead screwdriver underneath the cover to remove it and set the cover aside for the time being.

Once the cover is off, it’s time to move to the next step.


Related Door Articles

  • How To Replace The Screen On A Sliding Patio Door (Picture Guide) [COMING SOON]
  • Different Types Of Sliding Glass Door Locks (& When To Use Them) [COMING SOON]
  • Sliding Glass Door Vs. Center-Hinge Door: Which Is Better? (Pros & Cons List) [COMING SOON]

Step Two: Hold The Lock In Place On The Door & Mark The Door Frame With A Pencil

The next step to adding a lock to a sliding glass door is holding the lock in place and marking the spots to drill.

Hold the lock against the door frame in the spot you want to install it. If the lock doesn’t sit flush against both the frame and the door, then you might need to use the spacers provided in the kit or make your own spacers to get the lock to sit in the proper place.

My husband installed the lock for us! Keep the lock fully assembled (minus the screw cover) to mark the screw holes for drilling.

Now, take a pencil or marker and mark the screw holes in the door frame.

We didn’t mark the holes on the door yet in case something became misaligned during the installation.

Once the three holes are marked on the door frame, it’s time to move on to the next step.

Step Three: Drill The Marked Holes In The Door Frame & Screw In Part Of The Lock

The next step to adding a lock to a sliding glass door is drilling into the door frame and screwing in the first part of the lock.

Use a 1/8-inch drill bit to drill the three holes in the door frame.

Here’s a close-up of what the 3 holes look like.

After the holes are drilled, pick up the lock and pull the top and bottom locks apart to release the latch.

This piece is what gets screwed into the door frame.

Now, take one of the long screws and screw the latch into the door frame. Only screw in the center screw for the time being so we can test the door and make any small adjustments if necessary.

Using a Philips head drill bit makes this part super easy.

Once one of the latch screws is installed, it’s time to move on to the next step.

Step Four: Hold The Lock In Place On The Door Again & Mark The Door With A Pencil

The next step to adding a lock to a sliding glass door is holding the lock in place again and marking the spots to drill into the door itself.

Pick up the rest of the lock and “lock it” with the latch again. Then center the lock vertically where the bolts go into the latch as best you can and mark the four screw holes on the door with a pencil or marker.

If you don’t center the bolts while they’re in the latch, you might run into alignment issues when trying to open and close the door.

This lock is super easy to install by yourself in 10-20 minutes.

Once the holes on the door are marked, it’s time to move on to the next step.

Step Five: Drill The Marked Holes In The Door & Screw In The Other Part Of The Lock

The next step to adding a lock to a sliding glass door is to drill into the door and screw in the second half of the lock.

Again, use a 1/8-inch drill bit to drill into the door. Be very careful as you drill into the door because it is possible to crack the glass… which would totally defeat the purpose of what we are trying to do.

When my husband drilled into the door, he only went about 1/4-inch deep. Just enough to feel the drill break through the top layer of the surrounding frame, but not deep enough to potentially drill through the other side.

Don’t worry too much about this part. Most glass doors only have the glass sitting about a 1/4-inch into the surrounding frame, so the odds are you will not hit the glass while drilling.

Drilling into the glass was my biggest fear as well, but after installing 4 different locks on 4 different sliding glass doors, we haven’t had any issues with drilling through the glass.

My husband was extra careful while drilling into the door.

Once all four holes are drilled, use the small screws to screw the lock into the door. We used a Philips head screwdriver on the door to be able to control the pressure. Again, we didn’t want to risk cracking the glass, so we went slow and steady.

You can also only screw one screw in and test the door before drilling and screwing the rest of the holes to make sure the lock and latch align properly.

Once you’ve tested the door and the lock aligns with the latch properly, screw the remaining short screws into the lock on the door and the remaining long screws into the latch on the door frame.

Then it’s time to move on to the final step.

Step Six: Snap The Lock Cover Back In Place & Use The Door

The final step to adding a lock to a sliding glass door is to snap the lock cover back into place and use the door.

Grab the cover plate and snap it back into place to hide the screws on the door. Then voila! Your new sliding door lock is installed! Use it a few times to get the feel of it.

Once the cover is snapped back on, the lock blends seamlessly into the frame around the glass.
To unlock the lock, pull the top and bottom pieces apart. To relock the lock, push the top and bottom pieces back together.
Here’s what the LOCKiT! Double Bolt Sliding Door Lock looks locked and unlocked.

That’s it! This lock is super easy to install and feels really sturdy when you pull against it. Now you can have confidence that your patio door is secure!

Other FAQs About Sliding Door Locks

Here are some other frequently asked questions about sliding door locks to help you secure your patio door properly!

Can You Open A Locked Sliding Glass Door?

Locked sliding glass doors can be opened using a crowbar and lifting the door up and off its track. To prevent this, install a double-bolt lock that prevents the door from being lifted vertically and opened horizontally.

Can I Unlock A LOCKiT! Sliding Door Lock From The Outside?

LOCKiT! Sliding Door Locks can only be locked and unlocked from the inside. It is a secondary lock that is attached to the surface of the glass door and cannot be accessed from the outside.

Is Putting A Stick In The Sliding Glass Door A Good Way To Prevent A Burglar From Breaking In?

Putting a stick in the sliding door track can help prevent the sliding door from being lifted off its track with a crowbar. A double-bolt sliding door lock can do the same thing and looks nicer than a stick in the door’s track.

Final Thoughts On Installing A Sliding Glass Door Lock

There you have it!

We are very pleased with these locks and will be using them on the sliding doors we have in our other rental units (plus the sliding doors at my mom’s house!).

Hopefully, you find these locks helpful as well!

Catch you in my next post!

Love this post? Share it with others so they can make their patio door more secure!



How To Add A Lock To A Sliding Glass Door Without A Lock (LOCKiT! Picture Tutorial)

DIY With Christine is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com.