The best way to lock a sliding glass door is to use its built-in lock and add a second barrier that fits your door. A security bar can brace the door against opening, while track locks or adhesive stoppers can limit how far it slides. The right choice depends on your door’s clearance, track size, and whether you need a simple extra lock, a portable brace, or a pet-door setup.
Below, we compare five options for different needs. These add-on devices can provide an extra layer of security, but they are not a replacement for a working primary door lock or a careful fit check.
Table of Contents
Quick Comparison
| Product | Type | Best for | Fit or installation note |
|---|---|---|---|
| STERGDE Sliding Door Lock Bar (4 Pack) | Adhesive stopper | Limiting how far a door opens | Requires a door-frame gap greater than 0.5 inches; install at the top |
| AceMining Door Security Bar | Adjustable brace | A removable barrier for a patio door or travel | Check the opening and bar’s stated adjustment range before buying |
| ZRFCXE Sliding Window Locks (4 Pack) | Track lock | Doors or windows with a compatible track | Track height must exceed 0.48 inches and width must be under 0.61 inches |
| BeBecome Adjustable Security Bar | Adjustable brace | A portable, no-drill door brace | Adjusts from 17.7 to 50.5 inches, according to the listing |
| Eillion Large Dog Door for Sliding Glass Doors | Pet-door insert | Giving a large dog outdoor access | Measure frame height; installation requires drilling into the door frame |
Our Picks: Best Way To Lock A Sliding Glass Door reviews
STERGDE Adhesive Sliding Door Locks for Limiting Door Movement
This four-pack uses adhesive-backed locks to restrict how far a sliding door or window can open. The compact design does not require drilling, and the product is intended to mount at the top of the door or window. Its dual-unlock design calls for pressing buttons on both sides along with the cover plate, which may help reduce accidental release.
Before ordering, measure the gap between the door and its frame. The listing says the gap must be greater than 0.5 inches for the lock to work, so this option will not suit every door. Clean, suitable mounting surfaces and careful placement matter with any adhesive-mounted device; follow the product instructions and check that the lock is firmly attached before relying on it.
These are best viewed as opening-limiters, not as a substitute for the door’s main lock. They may suit households that want several no-drill stoppers for doors or windows, including to help limit access for children or pets. Compared with a floor-braced bar, they take up less space but depend on a compatible gap and adhesive attachment.
Pros:
- Four locks are included.
- No drilling or tools are required for installation.
- Dual-button release is designed to resist accidental opening.
- Can be used on compatible sliding doors and windows.
Cons:
- Requires a frame gap greater than 0.5 inches.
- Adhesive installation may not suit every surface or mounting location.
Verdict: Choose the STERGDE set if your door has the required clearance and you want a compact, no-drill way to limit its opening.
AceMining Adjustable Door Security Bar for a Removable Brace
The AceMining bar is a removable brace designed for both hinged doors and sliding doors. Its three-stage construction and lever-based setup are intended to make it quick to deploy, and its 2.2-pound weight makes it possible to store or take along when traveling. The listing describes an adjustment range of 21 to 46 inches, although the product title gives a different range, so confirm the current specifications and measure your door before purchasing.
For a sliding glass door, a brace typically sits between the door and a solid opposing surface. The bar’s rubber foot needs firm contact with the floor, and the listing specifically cautions against leaving a gap beneath it. A poor angle, slippery surface, or incorrect length can make a brace less useful, so check its placement each time you set it up.
This is a practical pick if you want a reusable barrier that can be removed without leaving an adhesive fitting behind. It is bulkier than a track lock and less convenient than a fixed lock for daily use, but it can work for a patio door or as a travel security accessory when the opening fits its adjustment range.
Pros:
- Designed for both hinged and sliding doors.
- Removable and suitable for storage or travel.
- Uses a lever-based setup rather than permanent installation.
- Includes rubber contact pieces for the floor or door.
Cons:
- The listing gives differing adjustment ranges, so verify fit before ordering.
- Needs firm, gap-free contact with the floor to work as intended.
Verdict: Consider the AceMining bar if you want a portable brace and your door opening falls within the verified adjustment range.
ZRFCXE Sliding Track Locks for Compatible Doors and Windows
Although named for windows, these four locks are also listed as compatible with some sliding doors. Each one tightens onto a track using screws and includes a protective pad to help prevent scratches. The package includes hex keys and a vertical key for installation and adjustment, so you can reposition a lock if your needs change.
Fit is the key question. The track’s height must be greater than 0.48 inches, and its width must be less than 0.61 inches, according to the product details. Measure the exact track where you plan to install the lock. When the dimensions match, a track-mounted device can be a useful way to limit movement without relying on adhesive or a floor brace.
The locks can also be positioned to leave a door or window partly open for ventilation, as described in the listing. That can be useful, but a partially open position is not the same as a fully secured opening. Compared with the STERGDE adhesive option, these locks use a mechanical screw-tightening setup; compared with a bar, they are smaller and less obtrusive.
Pros:
- Four track locks and installation keys are included.
- Can be repositioned along a compatible track.
- Protective pads are included to help reduce scratches.
- Can be used to restrict opening or allow a limited opening.
Cons:
- Track dimensions must match the stated limits.
- Listed for both windows and doors, but not every sliding-door track will fit.
Verdict: Pick the ZRFCXE set if your track measurements match and you prefer adjustable mechanical locks over adhesive stoppers or a brace.
BeBecome Adjustable Security Bar for a Wide Range of Openings
The BeBecome security bar is an adjustable metal brace for sliding doors, patio doors, and windows. Its listed range is 17.7 to 50.5 inches, giving it a broader stated span than the AceMining bar. The product includes rubber contact parts and a locking clip, and it is designed to be assembled and placed without drilling.
For a sliding glass door, set the brace between the moving panel and a firm surface, then adjust it so the rubber ends stay in contact. The listing emphasizes the non-slip ends and tension adjustment. Even so, stability depends on proper placement and a suitable floor and door surface, so make sure the bar is secure rather than assuming that its length alone guarantees a good fit.
This option may suit someone who wants a bar that can adapt to more than one opening or be packed for travel. Its main trade-off is the need to position and remove it whenever you use the door. If you want a compact device that remains attached to the track, the ZRFCXE or STERGDE options may be more convenient.
Pros:
- Wide stated adjustment range of 17.7 to 50.5 inches.
- No-drill setup.
- Rubber ends are intended to improve grip and protect surfaces.
- Can be used on sliding doors, patio doors, or windows.
Cons:
- Must be placed and removed as needed.
- Requires a suitable surface and careful adjustment for stable contact.
Verdict: The BeBecome bar is a good fit if you want a removable brace with a broad adjustment range and have a stable place to set it.
Eillion Sliding Glass Door Pet Door for Large Dogs
This product is a pet-door insert rather than a conventional add-on lock. It is designed to give a large dog access through a sliding glass door, with an aluminum frame, a flap, and a slide-in closure panel. The listing describes a flap measuring 10 by 16 inches and a frame height that adjusts from 75 7/8 to 81 inches.
Measure the door frame carefully before considering this setup. The product is intended for certain patio-door dimensions, and its installation requires drilling holes in the door frame. The listing also notes that the pet door’s opening direction depends on which side it is installed on and is not adjustable. It includes a safety lock, but adding a pet opening changes how the doorway is secured compared with a closed, unmodified door.
This choice makes sense for households that need a pet passage and are willing to install a more involved insert. It is not the right pick if your main goal is to add a simple security barrier to an existing sliding door. For that, a track lock or brace is more direct and does not create a pet opening.
Pros:
- Designed for large dogs, with a listed flap size of 10 by 16 inches.
- Adjustable frame height for the stated range.
- Includes a slide-in closure panel and a safety lock.
- Aluminum frame and weather-related features are specified in the listing.
Cons:
- Requires drilling into the door frame.
- Pet-door direction depends on installation side and is not adjustable.
Verdict: Choose the Eillion insert only if pet access is your priority and your frame measurements and installation needs match the product details.
How to Choose a Sliding Glass Door Lock
Decide what you need the lock to do
A track lock or adhesive stopper can limit how far the panel slides. A security bar braces the door from opening by using a floor or frame surface as support. A pet-door insert serves a different purpose: it provides animal access and changes the doorway setup. Decide whether your priority is preventing the door from sliding, adding a removable brace, or making room for a pet before comparing products.
Measure the door, frame, and track
Do not rely on a product title or a visual estimate. Measure the track width and height for a track lock, the gap between the door and frame for an adhesive stopper, and the opening span for a brace. For a pet-door insert, measure the frame height and check the flap dimensions. A small mismatch can make a lock difficult to install or ineffective in its intended position.
Choose an installation style that suits your home
Adhesive locks avoid drilling but depend on the required clearance and a suitable mounting surface. Track locks tighten onto the track and can be moved, but only if the track dimensions match. Security bars do not need a permanent fitting, but they require setup and storage. A pet-door insert is a more involved installation and, in this case, requires drilling into the frame.
Check how the device releases and how you will use the door
Think about who needs to operate the lock and how often the door is used. A device that is easy to set but awkward to release may be inconvenient for daily access. If you choose a bar, consider whether you are willing to place and remove it each time. For locks that limit the door to a partly open position, remember that an opening left for ventilation is still an opening.
Use an add-on lock as one part of door security
These products serve different roles and should not be treated as guaranteed protection against forced entry. Keep the door’s built-in lock in working order, install an add-on device according to its instructions, and check that it is secure before relying on it. If your existing lock is damaged or the door does not close correctly, address that problem rather than depending on an accessory alone.
FAQs
What is the simplest way to add security to a sliding glass door?
A compatible security bar or track lock can add a second barrier without changing the door itself. The best fit depends on your door’s opening, track dimensions, and whether you want a removable brace or a lock that stays attached.
Are sliding door security bars easy to install?
The bars in this guide are designed to be assembled or positioned without drilling. They still need correct adjustment and firm contact with the floor and door. Follow the instructions and check the fit whenever you set one up.
Can a window lock be used on a sliding glass door?
Some products are listed for both sliding windows and doors, including the ZRFCXE locks. Compatibility depends on the track dimensions, so measure the track and compare it with the product’s stated limits before ordering.
Do adhesive sliding door locks work on every door?
No. The STERGDE locks require a gap greater than 0.5 inches and are intended to be installed at the top of the door or window. Check the clearance and mounting surface before choosing them.
Can I leave a sliding door partly open with a track lock?
The ZRFCXE product is described as allowing a limited opening for ventilation. Keep in mind that a partly open door remains an opening, so use that position only when it suits your safety needs.
Is a sliding glass door pet insert a security lock?
No. A pet insert is designed to provide pet access, not to serve as a standalone security upgrade. The Eillion model includes a safety lock and closure panel, but it also requires frame installation and changes the doorway arrangement.
Should I use an add-on lock instead of the door’s built-in lock?
No. An add-on lock is best treated as an extra layer, not a replacement for a working built-in lock. If the original lock is broken or the door does not close properly, repair that issue as well.
Final Recommendation
For most shoppers who want a straightforward extra barrier, a properly sized security bar is the most versatile choice in this group. The BeBecome bar offers a broad stated adjustment range, while the AceMining bar may be worth considering when its verified range suits your opening. Choose the STERGDE adhesive locks for a compact, no-drill opening limiter if your door has the required clearance, or the ZRFCXE track locks if your measurements match. The Eillion insert is a specialized option for pet access, not a general-purpose door lock.
