4 Best French Door Locks for Home Security
The MOSECYOU French Door Lock, Adjustable Double Door Lock is the top pick for most buyers, making it one of the best french door locks for adding a simple layer of security. Its adjustable design is the main reason, since it can accommodate different spacing between double doors.
This guide is for homeowners, renters with compatible doors, and anyone replacing a loose or worn latch. The key details are adjustment range, metal construction, and compatibility with your door frame. A proper fit matters more than extra features, since an oversized or poorly aligned lock can leave gaps and weaken security. The 4 picks below are ranked with clear reasons and honest drawbacks for each, so you can compare fit, materials, installation, and daily convenience before choosing a door lock.
Quick Comparison
| # | Product | Best For | Price | |
|---|---|---|---|---|
| 1 | MOSECYOU French Door Lock, Adjustable Double Door Lock | French Door Homeowners | $19.59 | View → |
| 2 | Sumnacon 6-Inch Door Flush Bolt, 2-Pack | Double-Door Bolt Replacement | $12.99 | View → |
| 3 | Camtek Double Front Door Handle and Deadbolt Set | Complete Front Entry Upgrade | $72.98 | View → |
| 4 | FlyingAMZ Security Door Brace | Renters Seeking Added Door Security | $29.99 | View → |
4 Top French Door Lock Picks
These options are ranked by security, installation needs, and value, counting down to the strongest overall pick.
4. FlyingAMZ Security Door Brace
Best for: Homeowners adding a floor-mounted door brace
At $29.99, the FlyingAMZ Security Door Brace adds a second barrier at the bottom of a door. Its high-strength aluminum alloy parts include a floor-mounted base and a removable metal baffle. The brace works alongside a deadbolt, so it can help keep a door closed if the main lock fails. It fits standard doors, French doors, and some damaged or irregular doors, provided the floor can hold the base securely.
Installation requires a drill bit, screwdriver, and the included instructions. The base plate measures 0.4 inches high, and the door needs at least 0.5 inches of clearance from the floor to pass over it. To use the brace, slide the metal baffle into the base. This takes little effort after installation and can add time during an attempted forced entry. Check the clearance before ordering. The supplied screws may not work in concrete, so a concrete floor could require different anchors or fasteners.
Pros
- Aluminum alloy construction gives the brace a firm, floor-mounted support point.
- A removable baffle lets you switch the barrier on or off quickly.
- Fits standard, French, and some blemished doors when floor mounting is possible.
Cons
- It will not fit doors with less than 0.5 inches of bottom clearance.
- The included screws may fail in concrete, requiring compatible replacement hardware.
3. Camtek Double Front Door Handle and Deadbolt Set
Best for: Double-door replacement projects
The Camtek set combines a front door handle with a deadbolt for double doors, French doors, and some double garage doors. Its zinc alloy construction has a coating designed to resist peeling over long-term use. At $72.98, it provides a complete replacement option for buyers who want matching exterior hardware without ordering separate pieces.
Installation can use existing holes and requires only a screwdriver. The through-bolt adjusts across 1.5 inches, while the two latches support backsets of 2-3/8 or 2-3/4 inches. It fits doors from 1-3/8 to 1-3/4 inches thick. The handle reverses for left- or right-hand doors, and the keyed handle and deadbolt use the same keys. Inside, a turn button locks the set. The keys must return to their starting position before removal, and careful alignment is necessary during installation.
Pros
- Fits several common door setups, including double front and French doors.
- Adjustable backset and through-bolt help match existing holes.
- Reversible handle supports both left-hand and right-hand doors.
Cons
- Proper alignment is critical, so installation may take extra adjustment if the existing holes are not perfectly positioned.
- Buyers must confirm door thickness, backset, and hole spacing before purchase, since the listed ranges may not fit every double-door design.
2. Sumnacon 6-Inch Door Flush Bolt, 2-Pack
Best for: Double-door owners securing inactive panels
The Sumnacon set includes two 6-inch flush bolts for double, French, patio, composite, or wood doors. Each bolt measures 6 inches long, 0.79 inches wide, and 0.67 inches deep. The hardware fits into the door edge, so the bolt stays mostly hidden when installed. At $12.99, the two-piece package offers a practical way to secure the inactive door leaf at both the top and bottom.
These bolts use solid stainless steel construction, which helps resist rust and corrosion. A built-in spring holds the bolt in either the retracted or extended position. The lever-style switch should feel more controlled than a simple push-and-slide design. Reinforcing screws support the interior mechanism, while the included screws and surface strikes cover the basic installation hardware. Still, fitting flush bolts usually requires accurate measuring and door preparation. The six-inch length may not suit every door stile or existing cutout.
Pros
- Two bolts let you secure one inactive door leaf at both ends.
- Stainless steel construction resists corrosion for indoor or covered outdoor use.
- Spring-loaded lever stays retracted or projected during regular use.
Cons
- Installation may require chiseling or routing the door edge for a flush fit.
- The 6-inch body and 0.67-inch depth may not match every door or frame.
1. MOSECYOU French Door Lock, Adjustable Double Door Lock
Best for: Renters securing French double doors
The MOSECYOU is a barricade lock for double French doors. Its hardened-steel construction provides greater load-bearing strength than plastic door bars. The barrier helps prevent handle movement and resists forced kicks from outside. A sliding bar adjusts for different spacing between door handles. It fits standard round knobs and lever handles, and works with both inswing and outswing doors. At $19.59, it offers a simple security option for compatible doors.
Its U-shaped bracket has a 1 3/8-inch opening for the necks of most double-door knobs and levers. It also fits tubular handles under 1 3/8 inches in diameter, including some barn doors, gates, and double-door refrigerators. A waterproof storage pouch keeps the device together when not in use. The pouch can also hang from a door handle or stop for quick access. The included key tag helps identify keys, though the barricade itself is not a keyed lock.
Pros
- Hardened steel offers stronger resistance than plastic barricade bars.
- Adjustable sliding bar fits varying handle spacing.
- Works on inswing and outswing French doors.
Cons
- Fit depends on the handle neck or tube staying under 1 3/8 inches.
- It is designed for compatible double-door setups, not general single-door use.
Buying Guide
The most important factor is compatibility. French doors often have an active and inactive panel, so the lock must match the door thickness, borehole, and opening direction.
- Door measurements: Measure door thickness, backset, and borehole diameter before buying. Many replacements fit 1¾-inch doors with a 2⅜- or 2¾-inch backset.
- Lock style: Choose a single-cylinder deadbolt for a standard setup, or a multipoint lock if the door already has rods that secure at the top and bottom.
- Security rating: Look for an ANSI Grade 1 or Grade 2 deadbolt. Grade 1 suits exterior entry doors, while Grade 2 works for lower-risk side entrances.
- French-door alignment: Confirm the lock supports your active leaf and inactive leaf. A security bar or flush bolt may be needed to keep the second panel fixed.
- Installation and price: Keyed deadbolts often cost $25 to $80, while smart models commonly cost $100 to $300. Allow 30 to 90 minutes for installation, depending on existing holes and wiring.
- Weather and finish: For exposed doors, choose stainless steel or corrosion-resistant hardware. A covered keyway and an exterior-rated finish help in rainy or coastal areas.
If you cannot have everything, prioritize a correct fit and an ANSI-rated deadbolt over smart features or decorative finishes.
Frequently Asked Questions
How do I choose the right lock for French doors?
Choose a French door lock based on door thickness, swing direction, and how the two panels meet. Check measurements before buying, especially the backset and cylinder length. Most residential doors use a 2⅜-inch or 2¾-inch backset. A multipoint system can add stronger protection than a single deadbolt.
What type of lock works best on double French doors?
A multipoint lock or paired deadbolts usually works best for double French doors. These options secure the active panel and help hold the inactive panel in place. Look for a system that matches your door’s existing hardware. Some models lock at three points, including the top, middle, and bottom.
Can I install a French door lock myself?
You can install some French door locks yourself if the doors already have compatible holes and hardware. Basic replacements often need a screwdriver, tape measure, and about 30 to 60 minutes. New multipoint systems require more precise cutting, so a locksmith may prevent alignment and closing problems.
Are French door locks secure enough for exterior doors?
French door locks can secure exterior doors well when they include a solid deadbolt, reinforced strike plate, and strong screws. Choose hardware rated for exterior use, then anchor the strike plate with screws at least 3 inches long. Glass panels still create a separate security concern, even with a quality lock.
Conclusion
MOSECYOU French Door Lock, Adjustable Double Door Lock, is the strongest fit for homeowners who want a simple, adjustable way to secure paired French doors without adding a smart-home system. If your priority is faster entry, remote control, or access for several people, pick a keyed-alike or smart-compatible alternative instead because it may better match frequent use, multiple users, or an existing security setup. Before buying, double-check each door’s thickness, the gap and frame clearance, the lock’s compatibility with your door swing and existing hardware, the package quantity, the current price, and whether installation needs extra drilling or tools since listings can change and some packs cover only one opening.
