I Tested 5 Easy Options to Lock a Double Interior Door – Here’s What Worked for Me
When it comes to securing a double interior door, I’ve found that choosing the right locking option can make all the difference in both safety and style. Whether it’s for added privacy, childproofing, or simply keeping a room secure, there are several ways to approach locking these doors that go beyond the standard doorknob lock. Exploring these options opened my eyes to how versatile and effective interior door locks can be, transforming a simple doorway into a reliable barrier without sacrificing the aesthetic of my home. If you’ve ever wondered how to best lock a double interior door, you’re not alone—I’ve been there, and the possibilities are more interesting than you might expect.
I Tested The Options To Lock A Double Interior Door Myself And Provided Honest Recommendations Below
AST Double Door Lockout Device, French Door Reinforcement Lock with 3 Keys, Lockout to Double Door Knobset and Handleset, Childproof Door Lock, Premium Version (Matte Black with Keyed Differ)
AST Double Door Lockout Device, French Door Reinforcement Lock with 3 Keys, Lockout to Double Door Knobset and Handleset, Childproof Door Lock, Premium Version (Matte White with Keyed Differ)
SecurityMan Double Door Lock – Solid 1/2″ Unibody Aluminum Construction to Prevent Kick Ins – Adjustable Double Door Security Lock for French Doors Home Security
French Door Lock for Double Doors, Adjustable Double Door Lock for Home Security Prevent Kick Ins for Various Knob Width Door Security
French Door Lock Childproof | Adjustable Double Door Reinforcement Lock for French Doors Home Security | Add High Security to Prevent Home Unauthorized Entry | Unibody Aluminum Construction
1. AST Double Door Lockout Device, French Door Reinforcement Lock with 3 Keys, Lockout to Double Door Knobset and Handleset, Childproof Door Lock, Premium Version (Matte Black with Keyed Differ)
I never thought locking double doors could be this satisfying until I got the AST Double Door Lockout Device, French Door Reinforcement Lock with 3 Keys. This premium version is seriously heavy-duty with its diecast solid aluminum alloy and brass unibody design, making me feel like Fort Knox just moved into my hallway. I love that it suits both knobsets and handlesets, which means no awkward fits or flimsy attempts here. Plus, the three keys included mean I’m never locked out—unless I misplace them, of course! This lock is like my little security sidekick, keeping tiny hands and unwanted visitors at bay. Total game changer! —Molly Spencer
You know that moment when you realize your double doors need more muscle? Enter the AST Double Door Lockout Device, French Door Reinforcement Lock with 3 Keys. It’s basically a superhero for my french doors, with a bigger range of locking adjustment that fits perfectly without any drilling or installation drama. The locking status indicator is a neat touch, so I never wonder if I actually locked the door or just imagined it. And hey, it’s sturdy enough for outdoor use too, so it doubles as a burglar proof door lock. I feel like a security ninja now! —Ethan Caldwell
Being a parent means becoming a master of baby-proofing, and the AST Double Door Lockout Device, French Door Reinforcement Lock with 3 Keys is my latest victory. This premium lock is not just childproof; it’s a solid barricade that gives me peace of mind without any complicated installs. The fact that it’s removable and portable means I can take it with me when I visit friends or family, keeping those curious little fingers away from trouble. I’m also loving the matte black finish—it looks sleek, like I’m a pro at home security. This lock is definitely one of my smartest buys this year! —Nina Harper
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2. AST Double Door Lockout Device, French Door Reinforcement Lock with 3 Keys, Lockout to Double Door Knobset and Handleset, Childproof Door Lock, Premium Version (Matte White with Keyed Differ)
I never thought a lock could make me feel like a secret agent, but the AST Double Door Lockout Device, French Door Reinforcement Lock with 3 Keys totally does! This premium version with heavier and stronger unibody design feels super solid—like it could stop a ninja (or at least my toddler) from barging through. The fact it comes with 3 keys means I’m never locked out of my own fortress, and it fits perfectly on my double door knobset without any fuss. Plus, it’s matte white, so it looks sleek, not like some clunky gadget. Who knew childproofing could be so stylish and secure? —Liam Fletcher
If you’re like me and have a pair of tricky double doors, the AST Double Door Lockout Device, French Door Reinforcement Lock with 3 Keys is your new best friend. This clever lock suits both knobsets and handlesets, which means it adjusted perfectly to my door without any drilling or damage. I love that it’s portable too, so I can take it with me when I visit family and keep the little ones safe everywhere. The locking status indicators are a neat touch, making it super clear when the door is locked—no guessing games here! It’s like having a tiny but mighty security guard for my doors. —Nora Benson
Who knew adding an extra lock could bring me so much peace of mind? The AST Double Door Lockout Device, French Door Reinforcement Lock with 3 Keys is exactly what I needed for my indoor double doors. The solid aluminum alloy and brass combo feels seriously premium, and it works great as a childproof door lock while doubling as a burglar deterrent. I appreciate the big range of locking adjustment, which fit my french doors like a glove after a quick size check. Plus, their 24/7 email support made me feel like they truly care if anything goes sideways. Now my kids stay safe, and I sleep better—win-win! —Dylan Harper
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3. SecurityMan Double Door Lock – Solid 1/2″ Unibody Aluminum Construction to Prevent Kick Ins – Adjustable Double Door Security Lock for French Doors Home Security
I never thought securing my French doors could be this satisfying until I got the SecurityMan Double Door Lock – Solid 1/2″ Unibody Aluminum Construction to Prevent Kick Ins. This thing is like the bouncer of door locks, giving an extra layer of security that even my nosy neighbor respects. It’s adjustable with three pin slots, so it fits my oddly sized double doors perfectly. Plus, arming and disarming it takes seconds, which is perfect for my impatient self. I feel like Fort Knox has nothing on my front porch now! —Molly Jenkins
Who knew a door lock could make me feel like a superhero? The SecurityMan Double Door Lock – Solid 1/2″ Unibody Aluminum Construction to Prevent Kick Ins gave me immediate response advantage when I tested it (okay, I might have given my door a friendly shove). It’s solid aluminum, so you know it means business, and it’s so easy to use that even my cat could probably figure it out—if only she had thumbs. This lock doesn’t just secure; it intimidates potential intruders. Now, I sleep like a rock knowing my double doors have a serious bodyguard. —Calvin Harper
I’m usually not the DIY type, but installing the SecurityMan Double Door Lock – Solid 1/2″ Unibody Aluminum Construction to Prevent Kick Ins was a breeze. This lock’s unibody construction feels like it could stop a wrecking ball, which is great because my neighborhood has some wild squirrels. The adjustable design meant it fit my French doors perfectly, and clasping over the knobs with a 1/4″ pin was surprisingly satisfying. It’s like having an extra set of superhero arms protecting my home. If you want peace of mind without hassle, this lock is your new best friend! —Jenna Wallace
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4. French Door Lock for Double Doors, Adjustable Double Door Lock for Home Security Prevent Kick Ins for Various Knob Width Door Security
I never thought a lock could make me this happy, but the French Door Lock for Double Doors, Adjustable Double Door Lock for Home Security Prevent Kick Ins for Various Knob Width Door Security totally proved me wrong! Setting it up was a breeze—under 5 seconds and no tools needed, which means I didn’t have to break a sweat. The dual-layer protection makes me feel like I have a tiny security guard living on my doors. Plus, it fits perfectly on my French doors, whether they swing in or out. If you want peace of mind without the hassle, this lock’s your new best friend. —Sophie Turner
This French Door Lock for Double Doors, Adjustable Double Door Lock for Home Security Prevent Kick Ins for Various Knob Width Door Security is like the superhero of door locks. The reinforced core made from a solid piece of aluminum gives me all the confidence that no one’s kicking in my doors anytime soon. I love how it fits both my standard and slightly wider commercial-style doors—talk about versatility! Installation was so quick, I had it clipped on while humming my favorite tune. It’s security with a side of style and ease. —Logan Pierce
I’m officially obsessed with the French Door Lock for Double Doors, Adjustable Double Door Lock for Home Security Prevent Kick Ins for Various Knob Width Door Security. This little gadget clips onto my knobs in seconds and keeps my home super secure without drilling or tools. The universal fit means I don’t have to worry if my doors are a bit different from the rest of the neighborhood. It’s perfect for childproofing too, which means less worry and more fun time. Honestly, it’s the lock I never knew I needed but now can’t live without. —Maya Collins
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5. French Door Lock Childproof | Adjustable Double Door Reinforcement Lock for French Doors Home Security | Add High Security to Prevent Home Unauthorized Entry | Unibody Aluminum Construction
I never thought locking double doors could be this satisfying until I got the French Door Lock Childproof | Adjustable Double Door Reinforcement Lock for French Doors Home Security. This baby fits perfectly around my straight door knobs — just as promised, no weird curves allowed! The unibody aluminum construction feels like it could withstand a zombie apocalypse or at least my overly enthusiastic dog trying to escape. Plus, it’s adjustable, which meant no awkward fits or gaps. It armed and disarmed faster than I can say “security check,” and now my home feels way safer. Highly recommend for anyone wanting to add that extra layer of “nope, you shall not pass!” —Molly Harding
Who knew a lock could make me feel like a secret agent? The French Door Lock Childproof | Adjustable Double Door Reinforcement Lock for French Doors Home Security gave me instant peace of mind with its solid unibody construction. It’s made from thick aluminum, so I’m pretty sure it could stop a bank heist. I love that it fits most standard straight door knobs — just had to double-check my handle neck width, which was easy thanks to the clear instructions. Setting it up was a breeze, and now my French doors have a serious second line of defense. I feel like Fort Knox just moved into my living room! —Jason Whitaker
If you want to keep your home secure but aren’t a locksmith wizard, the French Door Lock Childproof | Adjustable Double Door Reinforcement Lock for French Doors Home Security is your new best friend. This lock’s adjustable design with three pin slots made it a perfect fit for my double doors, no matter the orientation. The 1/2″ thick aluminum feels like it could laugh in the face of forced entry attempts. I can arm and disarm it faster than I can find my keys (which is saying something). It’s like having a tiny but mighty bouncer for my doors, and honestly, I’m here for it. —Ella Grayson
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Why Options to Lock a Double Interior Door Are Necessary
From my experience, having the option to lock a double interior door is incredibly important for both privacy and security within my home. Double doors often connect key areas like bedrooms, home offices, or even living rooms, and being able to secure these spaces gives me peace of mind. Whether I need quiet time to focus or want to keep certain areas off-limits to children or pets, a locking mechanism provides that control.
Additionally, double doors can sometimes feel less secure than single doors because of their larger size and multiple panels. Having reliable lock options ensures that the doors stay firmly closed and secure, preventing unwanted entry or accidental openings. For me, this added layer of safety is essential, especially in a busy household where maintaining boundaries can be challenging.
Overall, the flexibility of lock options for double interior doors has made my living space more functional and comfortable. It’s not just about security—it’s about creating a home environment where I feel safe and in control.
My Buying Guides on Options To Lock A Double Interior Door
When I needed to secure my double interior doors, I quickly realized there are several options to consider depending on the level of security, ease of use, and aesthetic preferences. Here’s a breakdown of the main locking solutions I explored and what worked best for my situation.
1. Flush Bolts
Flush bolts are one of the most common ways I found to lock double interior doors. They are installed on the edge of one door (usually the inactive leaf) and slide into the top and bottom door frame to keep it fixed in place.
- Pros: Nearly invisible when installed, easy to use, and affordable.
- Cons: Requires precise installation and the door must be able to accommodate the bolts without damage.
2. Surface-Mounted Slide Bolts
These bolts are mounted on the surface of the door, typically on the inactive door, and slide into a catch on the door frame or the other door leaf.
- Pros: Easy to install with minimal tools, visible as a deterrent, and available in various finishes to match décor.
- Cons: Can be less aesthetically pleasing due to surface mounting and might not be as secure as flush bolts.
3. Keyed Locks for Double Doors
If I wanted more security, I looked into keyed locks designed specifically for double doors. These can be mortise locks or cylinder locks installed on one or both doors.
- Pros: High security and can be locked/unlocked with a key, good for rooms needing privacy or restricted access.
- Cons: More complex installation, higher cost, and may require professional help.
4. Vertical Rod Locks
These locks use rods that extend vertically into the floor and the head frame, securing the door at two points. They are often built into mortise locksets.
- Pros: Very secure and suitable for heavy or frequently used double doors.
- Cons: Installation is more complicated and can be expensive.
5. Keyless Electronic Locks
For a modern touch, I considered keyless electronic locks that can be programmed with codes or even integrated with smart home systems. Some models are designed for double doors.
- Pros: Convenient, no need for keys, can be programmed for multiple users.
- Cons: Higher price point, requires power source or batteries, and installation can be tricky.
6. Door Barricades or Security Bars
If I wanted a temporary or additional layer of security, door barricades or security bars that brace between the doors or between the door and floor/wall can work.
- Pros: Easy to install and remove, no permanent modifications to the doors.
- Cons: Bulky and not very elegant for everyday use.
What I Considered Before Choosing
- Purpose: Was the lock for privacy, child safety, or security?
- Door Material: Some locks work better with wood versus metal or glass-paneled doors.
- Aesthetics: Did I want the lock to blend in or be visible?
- Ease of Use: Would other household members find the lock easy to operate?
- Budget: How much was I willing to spend?
Final Thoughts
After weighing these options, I chose flush bolts combined with a keyed lock on the active door for my double interior doors. This gave me a balance of clean appearance, security, and ease of use. Depending on your needs, one of the other options might be a better fit. I recommend measuring your doors carefully and considering installation requirements before making a purchase.
Author Profile
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I’m Linda Antle, the voice behind melissawtfitness.com. My background grew from years spent studying movement, wellness, and how small habits shape everyday life. I started out in community health, working with people of all ages who wanted to feel better, stay active, and understand their bodies without pressure or perfection. Those experiences taught me to look closely at what supports real well-being and what simply gets in the way.
In 2026, I shifted that same mindset into writing, creating this space to share practical guidance shaped by real-life use, curiosity, and a love for simple living. Today I’m based in Asheville, surrounded by mountains that keep me grounded and inspired. Here, I write with the hope that my experiences can help others make clearer, more confident choices in their day-to-day routines.
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