10 Best Patio Door Auxiliary Locks In 2026: Secure Sliding Doors With Confidence

Patio doors are a common weak point in home security, especially sliding glass models that can be forced open or lifted off track. The right auxiliary lock adds a valuable second layer of protection without replacing your main hardware.

Below, we’ve rounded up 10 of the best options for added security, child-safe ventilation, and everyday convenience so you can choose a lock that fits your door and your priorities.

Best 10 Patio Door Auxiliary Locks Picks for 2026

Foot-Operated Security – Andersen Auxiliary Security Lock, Foot Latch

If you want a straightforward extra layer of protection for patio door auxiliary locks, this Andersen foot latch is built for simple, manual use. It can help secure a door fully closed, and its compact white design keeps the hardware unobtrusive.

Best For: Homeowners who want a compact foot-operated auxiliary lock for a sliding patio door or similar setup.

Pros:

• Foot-operated design keeps operation simple.
• Can secure the door fully closed.
• May also allow the door to be vented.
• Compact white finish with small overall dimensions.

Cons:

• Limited product details on exact door compatibility.
• No included installation hardware is mentioned in the notes.

This is a practical secondary lock if you specifically want a low-profile Andersen accessory that works by foot. It suits buyers who value simple operation more than adjustable features.

Clear Tool-Free Security – Burglabar 2 Pack Additional Security Lock

For patio door auxiliary locks that add fast, visible security without a bulky look, the Burglabar 2 pack is designed for sliding patio doors and sliding glass windows. It installs without tools and uses strong adhesive, but the fit depends on your clearance and you should measure before ordering.

Best For: Buyers who want a clear, tool-free additional lock for sliding patio doors or sash windows.

Pros:

• No-tools installation is simple.
• Clear Lexan design blends with glass.
• Adjusts to different door sizes.
• Strong adhesive is designed for maximum hold when properly applied.

Cons:

• Requires about 3/8 inch (9 mm) clearance to fit.
• Instructions should be reviewed before purchase and installation.
• Best suited to specific sliding door/window setups rather than universal use.

This is a good option if you want an unobtrusive secondary barrier and are comfortable checking measurements first. The clear construction and two-piece pack make it especially useful for matching the look of glass doors.

Foot Bolt for Gliding Doors – Andersen Auxiliary Foot Bolt Lock, Black

If you need patio door auxiliary locks that can both secure and slightly vent a door, this Andersen foot bolt lock is built for that kind of use. It operates with your foot and comes in a black finish for a more understated look.

Best For: Owners of Andersen Frenchwood gliding doors who want a foot-operated bolt lock with venting support.

Pros:

• Operates with your foot for hands-free use.
• Can secure the door fully closed.
• Can also allow the door to be vented.
• Black metal construction offers a durable, simple finish.

Cons:

• Specified for Andersen Frenchwood gliding doors.
• No assembly is required, but fit is model-specific.

This is a strong choice if you already have the right Andersen door and want a dedicated auxiliary bolt. Its main appeal is practical function: simple foot operation and flexible closed-or-vented positioning.

Heavy-Duty Backup Lock – Prime-Line U 9847 Patio Sliding Door Loop Lock

When shopping for patio door auxiliary locks, this Prime-Line loop lock is a classic secondary security option for sliding patio doors. It uses a hardened steel bar and diecast base, and the higher mounting position can also help with child-safe access control.

Best For: Households that want a durable secondary lock for a sliding patio door, especially where child-safe placement matters.

Pros:

• Hardened steel locking bar for heavy-duty construction.
• Diecast mounting plate and keeper add sturdiness.
• Includes mounting hardware for easier setup.
• Can be installed higher to limit access for children.

Cons:

• Dimensions must be verified for proper fit.
• Not a universal lock for every sliding door system.
• Single-pack design may not suit larger multi-door needs.

This loop lock is a solid backup choice if you want a more traditional mechanical safety layer. It is best suited to buyers who prioritize durability and a straightforward secondary lock over a low-profile appearance.

Reliable Vent Control – House Guard Sliding Glass Door Foot Lock

When you want patio door auxiliary locks that do more than just secure a door, this foot lock gives you a simple way to choose between a fully locked position and a partially open vent position. The keyless foot-operated design is practical for everyday use, and the white metal finish is made to fit the look of common sliding patio doors.

Best For: Homeowners who want a keyless auxiliary lock with adjustable ventilation.

Pros:

• Two-position vent control for locked or partially open settings
• Foot-operated design makes locking and releasing quick and keyless
• Built with durable metal construction for daily use
• White finish blends with many patio door styles

Cons:

• Requires compatible sliding door rail space for installation
• Installation should be checked carefully to avoid contact with glass panels

This is a straightforward auxiliary lock for sliding glass doors if you want added control without adding a keyed mechanism. It stands out most for its adjustable vent option, but proper fit and installation matter to get reliable results.

Andersen Fit Pick – Gliding Patio Door Auxiliary Foot Lock

If you need patio door auxiliary locks for an Andersen setup, this footbolt is built around that exact use case rather than a universal fit. It is designed for Andersen gliding patio doors and includes install steps for both a fully locked position and an open vent position, making it a focused replacement-style option.

Best For: Andersen gliding patio door owners looking for a compatible auxiliary footbolt.

Pros:

• Compatible with Andersen OEM Part #1997301
• Supports both locking and vent-position installation
• White diecast construction with compact footprint
• Clear installation guidance included for fitting and drilling

Cons:

• Not universal; intended for Andersen gliding patio doors only
• Requires careful measuring and drilling during installation

This is the most specialized option in the group, so fit is the deciding factor. If your door matches the Andersen design and you want a dedicated auxiliary foot lock, it offers the kind of purpose-built compatibility that generic locks may not.

Simple Extra Security – SDGINA Sliding Door Lock

For buyers comparing patio door auxiliary locks, this model focuses on extra security and child safety rather than a replacement footbolt design. It is meant for sliding windows or doors with a frame width no less than 2 inches, and it can be installed in two ways to suit different use cases around the home.

Best For: Families wanting an added safety lock for sliding patio doors or windows.

Pros:

• Provides additional security for patios, windows, and travel use
• Two installation options, including top or bottom placement
• 2-position locking supports slightly open vent use
• Designed with child safety in mind for pool-area doors

Cons:

• Requires a frame width of at least 2 inches
• Fit must be confirmed before purchase

This lock is a practical add-on when your main goal is peace of mind and child prevention. Its flexible install methods and two-position design make it useful, but only if your door frame matches the stated dimensions.

Heavy-Duty Keyed Security – Summit Doorware Sliding Patio Door Lock

If you want patio door auxiliary locks with a straightforward keyed setup, this Summit Doorware option is built for sliding patio doors and focuses on dependable physical security. Its alloy steel construction and included keys make it a practical pick for homeowners who want a simple lock that helps secure a sliding glass door without extra complexity.

Best For: Homeowners who want a keyed sliding patio door lock with a heavy-duty build for basic, reliable security.

Pros:

• Made from alloy steel for a sturdy, security-focused feel.
• Includes working keys for keyed access.
• Designed specifically for sliding patio doors and sliding glass doors.
• Compact rectangular design with a white finish.

Cons:

• Only one lock is included per package.
• Keyed operation may not suit buyers seeking keyless convenience.
• Finish is listed as unfinished, so appearance may be more utilitarian.

This is a solid no-frills choice among patio door auxiliary locks if your priority is a durable, keyed lock for a sliding door. It leans more toward practical home security than convenience features.

Versatile Auxiliary Bolt Lock – MY MIRONEY Sliding Door Lock

This MY MIRONEY model is a versatile pick in patio door auxiliary locks, especially if you want one lock that can work across several door and window types. It uses a Yale lock keyway, includes three keys and install parts, and its hardened steel bolt is designed for better resistance against cutting and sawing.

Best For: Buyers who need a multi-use auxiliary lock for sliding doors, folding doors, windows, and other compatible openings.

Pros:

• Hardened steel bolt is described as resistant to bolt cutters and hacksaws.
• Works with sliding doors, folding doors, accordion doors, closet doors, swing doors, and windows.
• Includes 3 keys plus some install parts.
• Uses a Yale lock keyway for keyed operation.

Cons:

• Installation hole spacing is specific at 85mm/3.3 inches.
• Not smart-home compatible.
• Metal finish and modern styling may not match every door setup.

For shoppers comparing patio door auxiliary locks by flexibility, this one stands out because it covers more than just patio doors. It looks like a strong fit if you want a keyed lock that can also secure other openings around the home.

Keyless Quick-Access Security – Black Auxiliary Sliding Patio Door Lock

Among patio door auxiliary locks, this keyless model is geared toward quick access and simple installation. It uses alloy and stainless steel for a durable build, installs with only two screws on the main body, and is designed to secure framed glass doors, sliding doors, and several other compatible openings.

Best For: Users who want a keyless auxiliary lock for sliding patio doors and similar framed openings.

Pros:

• Keyless operation avoids the hassle of carrying or losing keys.
• Requires only 2 screws to secure the main body.
• Made from alloy/stainless steel for durability and fade resistance.
• Can be used on framed glass doors, wooden doors, aluminum doors, folding doors, and windows.

Cons:

• Keyless design may not appeal to shoppers who prefer a keyed lock.
• Includes two sets of locks, but the overall package still centers on a simple utility design.
• Silver color may not suit every door finish preference.

If convenience matters as much as security, this is one of the more practical patio door auxiliary locks to consider. The keyless format and broad installation compatibility make it a flexible option for everyday use.

How We Picked the Best Patio Door Auxiliary Locks

We focused on locks that offer real-world security value, clear fit compatibility, and practical installation. Priority went to models with solid materials, dependable locking action, and designs that work for common sliding patio doors, gliding doors, and select Frenchwood-style setups.

We also looked at ease of use, whether the lock supports venting or keyless convenience, and whether the product details provided enough sizing information to help buyers confirm compatibility before ordering.

Quick Comparison

Most Patio Door Auxiliary Locks fall into a few categories: foot bolts and foot latches for added bottom-edge security, loop-style locks for simple reinforcement, and key-operated or keyless locks for everyday locking and child safety. Some are designed as OEM-style replacements, while others are universal add-ons meant to improve security on standard sliding doors.

If your goal is maximum deterrence, choose a sturdier keyed model or a lock with a strong steel body. If you want faster daily use or easier ventilation control, look for a vent lock or foot latch design that lets you secure the door partially open.

Key Buying Factors for Patio Door Auxiliary Locks

Door Type and Compatibility

Measure carefully and confirm whether the lock is meant for an Andersen, Frenchwood, or universal sliding door. Hole spacing, mounting style, and door thickness matter more than the product name alone.

Security Level

Look for hardened steel, tight engagement, and a design that resists prying or lifting. A secondary lock should complement your existing latch, not just duplicate it.

Venting and Child Safety

Some Patio Door Auxiliary Locks are designed to allow a controlled gap for airflow while still blocking wider opening. This can be useful for households with children or pets, but only if the position is secure and easy to verify.

Ease of Installation

Many buyers prefer screw-on hardware with straightforward tools and included mounting parts. If you are not replacing an OEM part, make sure the install process matches your comfort level and door material.

Who Should Buy Which Patio Door Auxiliary Locks?

Choose a foot bolt or foot latch if you want a low-profile second lock for a sliding or gliding patio door. Pick a loop lock if you want a simple, budget-friendly security upgrade. Go with a keyed or brand-specific replacement if you need a more precise fit or want stronger everyday control. For renters or families prioritizing convenience, a keyless auxiliary option may be the best balance of security and ease of use.

In short, the best Patio Door Auxiliary Locks are the ones that match your door, your daily routine, and the level of protection you actually need.