For double doors, the right deadbolt depends on the whole door assembly—not just the lock. First identify the active leaf, which opens for everyday entry, and the inactive leaf, which is held in place separately in many designs. Then check how the two leaves meet, how the inactive leaf is retained, and whether the door’s preparation matches the lock.
How do you choose locks for French doors or other double doors?
Start by treating the entry as a coordinated assembly. A deadbolt may lock the active leaf, but the inactive leaf, meeting stile or astragal, frame, strike, and installation all affect how the doors function together. A lock that fits one double-door system may not fit another.
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- Identify the active and inactive leaves. The active leaf is the one used for ordinary entry. Find out how the inactive leaf is held shut; some configurations use top and bottom flush bolts or slide bolts.
- Record the existing preparation. Note door thickness, bore and edge preparation, backset, strike position, handing, and the hardware already fitted. Compare those details with the candidate lock’s installation instructions.
- Check the meeting point. Determine whether the deadbolt engages a strike in the frame, a component on the inactive leaf, or another part of the door system. An astragal or other meeting-stile component may join or cover the gap between the leaves.
- Consult the door manufacturer’s instructions. If the door uses a multipoint mechanism or proprietary hardware, confirm compatible parts and installation requirements before considering a standard deadbolt.
Schlage’s guidance says a single-cylinder mechanical deadbolt can be used for French doors, but that general guidance is not a guarantee that one will fit every door. Match the lock to the door’s measurements and geometry.
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The hardware depends on how the particular doors are built and how they open. These components have different jobs and are not automatically interchangeable.
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| Component | What it does | What to verify |
|---|---|---|
| Deadbolt on the active leaf | Locks the leaf used for everyday entry. | Door preparation, thickness, backset, cylinder function, strike alignment, and the lock maker’s instructions. |
| Flush bolts or slide bolts on the inactive leaf | Hold the inactive leaf in place in configurations that use them. | Existing bolt locations and the door maker’s guidance for the specific door. |
| Astragal or meeting-stile component | Joins, covers, or helps secure the meeting area between the leaves, depending on the system. | Door handing, swing direction, profile, and compatibility with the installed assembly. |
| Multipoint lock | Engages at several points rather than relying on one locking point. | Compatibility with the door and frame, required preparation, and system-specific instructions. |
For example, PEMKO describes its PemGuard 353 Series as a security astragal intended for outswing doors. That description does not establish compatibility with every outswing double door or with other door configurations.
When is a multipoint lock worth considering?
A multipoint mechanism is an alternative when the door is designed for it or can be prepared for a compatible system. Reeb explains that multipoint locks engage at several points and require additional door and frame preparation. This means replacing one part is not necessarily a simple swap for a conventional deadbolt.
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Check the exact system’s instructions and support. A building approval for a particular product applies only to that named system and its stated installation conditions. For example, the Florida Building Commission’s March 20, 2023 approval for the Securitech Trident TEL-IAL refers to that system and the 2023 Florida Building Code, 8th edition; it is not a general approval of multipoint locks.
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A single-cylinder deadbolt uses a key on the exterior and a thumbturn on the interior. A double-cylinder deadbolt requires a key from both sides. Although Schlage notes that some homeowners choose a double-cylinder lock for doors with glass, needing a key to exit can create an emergency-egress concern.
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Do not treat a double-cylinder lock as an automatic security upgrade. Rules and circumstances differ by location and building, and an older City of Alexandria handout is not current code guidance. Check current local requirements and the lock and door manufacturers’ instructions before choosing a keyed interior function.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What to compare before buying
If the door supports a conventional deadbolt, compare candidate locks against the existing preparation and the manufacturer’s specifications. If it has a multipoint mechanism, look for compatible system parts instead of assuming a standard cylinder lock will work.
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- Door thickness and bore or edge preparation.
- Backset and strike alignment.
- Whether the cylinder is single- or double-cylinder, and whether that function suits the entry.
- Finish and keying requirements.
- How the inactive leaf is retained and how the deadbolt engages the frame or meeting stile.
- Installation instructions and any stated requirements for the door and frame.
The available sources do not establish comparable forced-entry test results that would justify ranking a conventional deadbolt, a multipoint system, or a particular astragal as universally best. Choose based on the specific door’s compatibility and instructions rather than a one-size-fits-all security claim.
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