Best Sliding Glass Door Locks of 2025

Sometimes the standard mortise locks on sliding glass patio doors aren’t enough to withstand a home invader. This is where sliding glass door locks come in handy—especially for renters, parents wanting to keep kids safe, and homeowners with patios.

To prevent intruders from damaging your sliding glass door lock or taking the door off the track, check out our top picks for the best sliding door locks. We'll also explain the different types of sliding glass door locks to help you find the right one.

The Lion Lock fastens tightly with two simple thumbscrews and a secure rubber grip that clings tightly onto your door’s track. This prevents the door from sliding back far enough for someone to slip in or out.

We found one design flaw with the Lion Lock. It blocks access for those trying to get in by stopping the sliding door, but it’s easy to undo from the inside. So kids, teens, or other adults might be able to loosen the thumbscrews and open the door to go outside.

Lion Locks come in packs of ten, so you can secure your windows too. They can hold up stubborn windows or keep others closed, depending on your needs.

The BK110 also comes with an optional childproofing tab that makes lifting the bar difficult for little fingers. It can’t keep everyone inside though. Adults and teenagers can use this sliding patio door lock pretty easily, which is good and bad.

So while the BK110 won’t stop any teenagers from sneaking out of your home, it will block intruders from entering your sliding patio door or taking it off the track.

Plus, you can place the bolt as far up or down the doorframe as you like, making it suitable for homes with small children.

The LockiT sliding door lock requires a drill and a little bit of know-how, but all its parts come in the package. Start by fastening the latch onto the door frame and lining up the lock to match it. We found in-depth video instructions as well as a user manual to help you through the process.

Adding a security lock can help you protect the door, but you also need to protect the glass. If you’re concerned about intruders, strengthening the glass is a smart second line of defense.

Start by adding security window film. Much like the stick-on glass protectors for your phone screen, this film keeps your glass door from shattering. You can also find window film that mimics frosted glass to lower visibility into your home.

You should also add curtains and keep your blinds and shades closed when your door isn’t in use. Otherwise, unwanted guests can see inside your home.

While they’re a last line of defense, glass break sensors are helpful during a home invasion. When an intruder shatters your glass door, the glass break sensor will notify your home security system and you. This alert tells you exactly when your glass door was broken and connects you to the right authorities to get rid of the intruder.

Finally, make sure you come up with a game plan for what to do when you're locked out that doesn't involve trying to break in through the patio door. Try a smart door lock on a traditional deadbolt-style door to prevent these predicaments.

Your sliding glass door offers convenience and natural light, but it also presents security risks. Our top picks will beef up your sliding glass door security:

• Lion Lock's installation is a breeze with no tools required.
• BK110 Security Bar is simple, affordable, and has an optional childproofing tab.
• LockiT Double Bolt Sliding Door Lock offers the security of a secondary lock with customized lock placement.

We narrowed down the best sliding glass door locks by reading customer reviews and watching installation videos. We checked some of the web’s most popular hardware sites for the highest-rated products with plenty of reviews and highly regarded name brands. Learn more about how we rank this and all our other best-of lists by reading our full methodology.