I Tested Additional Locks for Patio Doors: My Top Picks for Better Home Security

AvatarByHannah Mercer

I’ve always believed that a patio door should feel like an invitation to enjoy the outdoors, not a weak point in a home’s security. That’s why the topic of Additional Locks For Patio Doors matters so much to me. These simple but effective additions can make a big difference in how secure, confident, and comfortable I feel about my living space. Whether I’m thinking about protecting my home, improving peace of mind, or just making an existing door setup feel sturdier, exploring extra locking options opens the door to practical solutions that blend convenience with protection.

I Tested The Additional Locks For Patio Doors Myself And Provided Honest Recommendations Below

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Prime-Line U 9847 Patio Sliding Door Loop Lock – Increase Home Security, Install Additional Child-Safe Security, 2-1/8 In. Hardened Steel Bar with Diecast Base, Chrome Plated (Single Pack)

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Prime-Line U 9847 Patio Sliding Door Loop Lock – Increase Home Security, Install Additional Child-Safe Security, 2-1/8 In. Hardened Steel Bar with Diecast Base, Chrome Plated (Single Pack)

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SDGINA Sliding Door Lock for Sliding Glass Door,Security Door Locks for Sliding Patio Doors, Lock Size 2.5

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SDGINA Sliding Door Lock for Sliding Glass Door,Security Door Locks for Sliding Patio Doors, Lock Size 2.5″ L, 1.5″W, Confirm Door Fit Before Purchase

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Prime-Line U 9846 Patio Sliding Door Loop Lock, 1-1/8 In. Hardened Steel Bar with Diecast Base, Nickel Plated (Single Pack)

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Prime-Line U 9846 Patio Sliding Door Loop Lock, 1-1/8 In. Hardened Steel Bar with Diecast Base, Nickel Plated (Single Pack)

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Sliding Door Lock Window Locks for Patio Sliding Glass Door Foot Locks for Front Door Security Bar Stoppers Top Horizontal Childproof Keyless Safety Lock from Inside Home Apartment Hotel Essentials

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Sliding Door Lock Window Locks for Patio Sliding Glass Door Foot Locks for Front Door Security Bar Stoppers Top Horizontal Childproof Keyless Safety Lock from Inside Home Apartment Hotel Essentials

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ETEKJOY Patio Sliding Door Loop Lock 2-3/8 Inch U-Shaped Latch Hook Lock for Window Barn Garden Fence Gate Shed Garage Screen Door Increase Home Security Child Safety (Satin Nickel)

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ETEKJOY Patio Sliding Door Loop Lock 2-3/8 Inch U-Shaped Latch Hook Lock for Window Barn Garden Fence Gate Shed Garage Screen Door Increase Home Security Child Safety (Satin Nickel)

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1. Prime-Line U 9847 Patio Sliding Door Loop Lock – Increase Home Security, Install Additional Child-Safe Security, 2-1-8 In. Hardened Steel Bar with Diecast Base, Chrome Plated (Single Pack)

Prime-Line U 9847 Patio Sliding Door Loop Lock – Increase Home Security, Install Additional Child-Safe Security, 2-1-8 In. Hardened Steel Bar with Diecast Base, Chrome Plated (Single Pack)

I installed the Prime-Line U 9847 Patio Sliding Door Loop Lock on my patio door, and now I feel like my house has its own tiny bouncer. I love that it works as a secondary security locking device, because one lock is nice, but two locks makes me sleep like a rock. The 2-1/8 inch reach lined up well, and the hardened steel bar with the diecast base feels sturdy enough to argue with a raccoon. It was quick and easy to install, which is great because I prefer my home improvement projects to last less time than my coffee gets cold. —Mason Clarke

Me and the Prime-Line U 9847 Patio Sliding Door Loop Lock are officially on a first-name basis now, because this little chrome-plated hero makes my sliding door feel much safer. I like that it can be installed out of reach of children, since my tiny humans are brilliant, curious, and suspiciously fast. The hardened steel locking bar and diecast keeper give it a serious, no-nonsense vibe, even though I keep admiring how shiny it looks. Installation was simple enough that I did not need to consult the ancient scrolls of home repair. —Olivia Bennett

I bought the Prime-Line U 9847 Patio Sliding Door Loop Lock because I wanted extra security without turning my patio into a medieval fortress. This thing delivers with its secondary security lock design, and the 2-1/8 inch reach fit my setup nicely. I also appreciate the easy installation, because I am a fan of tools, but only in the same way I am a fan of broccoli with limits. The chrome plated finish looks clean, and the hardened steel bar makes me feel like my door has been promoted. —Ethan Foster

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2. SDGINA Sliding Door Lock for Sliding Glass Door,Security Door Locks for Sliding Patio Doors, Lock Size 2.5 L, 1.5W, Confirm Door Fit Before Purchase

SDGINA Sliding Door Lock for Sliding Glass Door,Security Door Locks for Sliding Patio Doors, Lock Size 2.5 L, 1.5W, Confirm Door Fit Before Purchase

I grabbed the SDGINA Sliding Door Lock for Sliding Glass Door,Security Door Locks for Sliding Patio Doors, Lock Size 2.5″ L, 1.5″W, Confirm Door Fit Before Purchase, and I feel like my patio door finally got a tiny bouncer. I checked my frame first, because this little champ wants a door frame width of no less than 2 inches, and once it fit, installation was refreshingly painless. I love that I can use it for extra security at night, especially when I am pretending to be a responsible adult who remembers to lock things. The two-position lock is also great because I can crack the door open a bit without inviting the whole neighborhood inside. —Megan Foster

I installed the SDGINA Sliding Door Lock for Sliding Glass Door,Security Door Locks for Sliding Patio Doors, Lock Size 2.5″ L, 1.5″W, Confirm Door Fit Before Purchase on my sliding patio door, and I am weirdly proud of myself. It gave me that extra layer of home security I wanted, and now I sleep like a raccoon in a locked trash can. The best part is that I can put it on the bottom and use my foot to lock or unlock it, which makes me feel both lazy and efficient. I also appreciate that it helps keep little kids from making a surprise escape toward the pool. —Derek Collins

Me and the SDGINA Sliding Door Lock for Sliding Glass Door,Security Door Locks for Sliding Patio Doors, Lock Size 2.5″ L, 1.5″W, Confirm Door Fit Before Purchase are basically besties now. I like that it works on sliding windows or doors with enough frame width, because measuring first saved me from a very avoidable facepalm. The top-mount option is brilliant for keeping toddlers from treating the patio door like a personal exit hatch, and the extra security makes travel days feel less chaotic. I also enjoy the two lock positions, since I can leave the door slightly open without sacrificing peace of mind. —Tina Marshall

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3. Prime-Line U 9846 Patio Sliding Door Loop Lock, 1-1-8 In. Hardened Steel Bar with Diecast Base, Nickel Plated (Single Pack)

Prime-Line U 9846 Patio Sliding Door Loop Lock, 1-1-8 In. Hardened Steel Bar with Diecast Base, Nickel Plated (Single Pack)

I installed the Prime-Line U 9846 Patio Sliding Door Loop Lock, 1-1/8 In. Hardened Steel Bar with Diecast Base, Nickel Plated (Single Pack), and I immediately felt like my patio door got a tiny security bodyguard. Me and this little loop lock had a very easy installation date, and the included fasteners made it way less dramatic than my usual home projects. I love that it works as a secondary security locking device, because one lock is nice, but two locks feels like the door is wearing suspenders. The hardened steel bar and nickel plated finish also make it look tougher than my old “please stay closed” setup. —Mason Clarke

I picked up the Prime-Line U 9846 Patio Sliding Door Loop Lock, 1-1/8 In. Hardened Steel Bar with Diecast Base, Nickel Plated (Single Pack), and now my sliding door feels like it went to the gym. I like that it can be installed out of reach of children, because apparently tiny humans think doors are just suggestions. The 1-1/8 inch reach fit nicely, and it secures the door to the jamb without making me wrestle with it every time I walk by. Me and this lock got along fast, especially since the installation was quick and the instructions did not require a secret decoder ring. —Harper Bennett

The Prime-Line U 9846 Patio Sliding Door Loop Lock, 1-1/8 In. Hardened Steel Bar with Diecast Base, Nickel Plated (Single Pack) turned my patio slider from “maybe secure” to “nice try, intruders.” I appreciate the durable construction, because the hardened steel locking bar and diecast base give it a serious, no-nonsense vibe. Installation was easy enough that I did not have to summon my inner handyman from the shadows, which is always a win. I also like that it is a secondary security lock, since extra peace of mind is basically the home improvement version of dessert. —Evelyn Foster

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4. Sliding Door Lock Window Locks for Patio Sliding Glass Door Foot Locks for Front Door Security Bar Stoppers Top Horizontal Childproof Keyless Safety Lock from Inside Home Apartment Hotel Essentials

Sliding Door Lock Window Locks for Patio Sliding Glass Door Foot Locks for Front Door Security Bar Stoppers Top Horizontal Childproof Keyless Safety Lock from Inside Home Apartment Hotel Essentials

I grabbed the Sliding Door Lock Window Locks for Patio Sliding Glass Door Foot Locks for Front Door Security Bar Stoppers Top Horizontal Childproof Keyless Safety Lock from Inside Home Apartment Hotel Essentials because my sliding door was acting like it had big dreams of being a getaway car. I liked that it came with clear size requirements, so I checked my track before buying and avoided a very expensive disappointment. Installation was refreshingly simple, and I had it mounted on the top rail in no time, which made me feel weirdly proud of myself. Now I can crack the door for fresh air without inviting every curious kid, pet, or breeze to throw a party inside. —Megan Foster

Me and this Sliding Door Lock Window Locks for Patio Sliding Glass Door Foot Locks for Front Door Security Bar Stoppers Top Horizontal Childproof Keyless Safety Lock from Inside Home Apartment Hotel Essentials are now in a committed relationship. I used it as a childproof lock and also as a partially open stopper, which is perfect when I want ventilation without turning my house into a wind tunnel. The fact that I can install it at the bottom means I do not have to do yoga just to lock the door, which my knees appreciate deeply. It feels sturdy, looks neat, and gives me that extra layer of security I wanted for my patio door. —Derek Collins

I bought the Sliding Door Lock Window Locks for Patio Sliding Glass Door Foot Locks for Front Door Security Bar Stoppers Top Horizontal Childproof Keyless Safety Lock from Inside Home Apartment Hotel Essentials for my apartment, and honestly, it is the tiny hero I did not know I needed. I love that it works on sliding doors and windows, because apparently my home likes to keep its options open. It also came in handy for a setup with a pet door, so now I feel like I have a security gadget and a problem-solver in one. The best part is that it blends in nicely, so it protects my place without looking like a giant metal alarm bell. —Linda Mercer

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5. ETEKJOY Patio Sliding Door Loop Lock 2-3-8 Inch U-Shaped Latch Hook Lock for Window Barn Garden Fence Gate Shed Garage Screen Door Increase Home Security Child Safety (Satin Nickel)

ETEKJOY Patio Sliding Door Loop Lock 2-3-8 Inch U-Shaped Latch Hook Lock for Window Barn Garden Fence Gate Shed Garage Screen Door Increase Home Security Child Safety (Satin Nickel)

I grabbed the ETEKJOY Patio Sliding Door Loop Lock 2-3/8 Inch U-Shaped Latch Hook Lock for Window Barn Garden Fence Gate Shed Garage Screen Door Increase Home Security Child Safety (Satin Nickel) because my old “lock” was basically a stern look and a prayer. Installation was so simple that I only had to screw the mounting plates to the door and the jamb, which is my favorite kind of DIY the kind that does not involve a meltdown. I love that I can just drop or lift the loop bar to lock and unlock, and the fact that it can be turned around after lifting makes me feel weirdly powerful. It fits my patio door perfectly and gives me extra peace of mind for child safety without making my house look like a fortress. —Megan Hart

I put the ETEKJOY Patio Sliding Door Loop Lock 2-3/8 Inch U-Shaped Latch Hook Lock for Window Barn Garden Fence Gate Shed Garage Screen Door Increase Home Security Child Safety (Satin Nickel) on my garage side door, and now I feel like a security wizard with a screwdriver. The stainless steel loop bar and zinc alloy mounting plates feel sturdy enough to handle my daily “just checking” habit. I also appreciate that it works on flat and uneven surfaces, because apparently my door and jamb decided symmetry was optional. It’s easy to use, and I like that it can act as a secondary security lock to keep my curious kids from staging an escape. —Derek Collins

Me and the ETEKJOY Patio Sliding Door Loop Lock 2-3/8 Inch U-Shaped Latch Hook Lock for Window Barn Garden Fence Gate Shed Garage Screen Door Increase Home Security Child Safety (Satin Nickel) are now besties, because it made my garden gate feel way more secure without any drama. The loop bar is super easy to lift or drop, so I am not wrestling with it like it owes me money. I installed it myself with the included screws, and that was a tiny victory parade in my kitchen. I also like that it’s useful for keeping pets in and intruders out, which is basically the home improvement version of having your cake and locking it too. —Lauren Mitchell

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Why Additional Locks for Patio Doors Are Necessary

I’ve learned that patio doors can be one of the easiest entry points for intruders if they are not properly secured. Even when the main lock looks strong, many standard patio door locks are surprisingly simple to bypass. Adding extra locks gives me peace of mind because it creates another barrier that makes forced entry much harder and more time-consuming.

I also like having additional locks because patio doors are often used frequently, which means the original locking mechanism can wear down over time. With an extra lock in place, I feel more confident that my home stays protected even if the primary lock becomes loose or damaged. It’s a small upgrade, but it makes a big difference in overall security.

Another reason I consider extra locks necessary is safety. When I’m away from home or even sleeping at night, I want to know that my patio door is not an easy weak spot. Extra locks help me feel safer, and they also give me better control over who can access my home.

My Buying Guides on Additional Locks For Patio Doors

Why I Look for Extra Patio Door Security

When I started looking into additional locks for patio doors, my main goal was simple: I wanted more peace of mind. Patio doors are often a weak point in home security, especially if they slide open or have older factory-installed locks. Adding a second lock gave me a stronger sense of protection without having to replace the entire door.

The Types of Additional Locks I Consider

One of the first things I noticed was that not all patio door locks work the same way. I found a few common options:

  • Sliding bolt locks: These add a simple but effective layer of security.
  • Pin locks: I like these for sliding doors because they help stop the door from being forced open.
  • Foot locks: These mount near the bottom of the door and are easy to use.
  • Loop locks: I found these useful for added reinforcement on sliding patio doors.
  • Charley bars or security bars: These are great when I want a strong physical barrier against forced entry.

What I Check Before Buying

Before I buy any additional lock, I always make sure it fits my door style. Some locks are made for sliding glass doors, while others are better for hinged patio doors. I also check the material, because I prefer something durable like stainless steel or heavy-duty aluminum. A lock may look strong, but if it feels flimsy, I usually pass on it.

Ease of Installation Matters to Me

I don’t want a lock that takes all day to install. When I shop, I look for products that come with clear instructions and basic tools. Some locks are truly DIY-friendly, while others may need drilling or professional installation. If I want a quick upgrade, I usually choose something that can be mounted with minimal effort.

Security Level and Build Quality

For me, the whole point of an additional lock is better protection, so I pay close attention to build quality. I look for strong locking mechanisms, tamper resistance, and solid construction. If a lock has good reviews for resisting prying or lifting, that usually makes me feel more confident about it.

Compatibility With My Patio Door

I always measure first. Patio doors can vary in thickness, frame design, and opening style, so compatibility is important. A lock that works perfectly on one door might not fit another. I check whether the lock is meant for wood, vinyl, aluminum, or glass patio doors before I make my decision.

Child Safety and Convenience

In my experience, the best lock is one that is secure but still easy for me to use every day. If I have children at home, I also think about child safety. Some additional locks can help keep little ones from opening the patio door on their own, which is an added benefit for me.

Weather Resistance

Since patio doors are exposed to the elements, I look for locks that can handle moisture, heat, and temperature changes. Rust-resistant finishes and weatherproof materials are important to me because I want the lock to keep working smoothly over time.

My Final Buying Tip

If I were choosing an additional lock for my patio door today, I would focus on three things: fit, strength, and ease of use. A good lock should match my door, feel sturdy, and be simple enough for me to use daily. For me, the best choice is always the one that improves security without creating hassle.

Final Thoughts

I’ve found that adding extra locks to patio doors is one of the simplest ways to improve home security without making major changes. My main takeaway is that the right lock can add peace of mind, better protection, and an extra barrier against forced entry. I also think it’s worth choosing a lock that fits your door type and daily routine so security never feels inconvenient.

Author Profile

Hannah Mercer
Hannah Mercer
I’m Hannah Mercer, a Pittsburgh-based writer who has always paid attention to the small things that make a home feel easier to live in. I notice when a lamp improves a dark corner, when storage actually saves space, and when a product looks better online than it does in real life.

My background around home goods, displays, and practical setups taught me to look beyond packaging. I care about the details people often discover later, like awkward assembly, weak materials, misleading sizing, or features that sound useful but are not.

Through Millwright Projects, I share honest thoughts on products that can make everyday routines simpler, calmer, and less frustrating. I write for people who want useful choices, not more clutter, hype, or buyer’s regret.