Smart Lock for French Doors UK¶

Choosing and fitting a smart lock for French doors in the UK - single-point locking, cylinder types, and brand recommendations.

Smart Lock Requirements for French Doors¶

French doors present a unique challenge for smart locks because they typically use a single-point locking system on the active leaf, while the passive leaf is secured with bolts at the top and bottom. The Yale Conexis L2 (£199) is the most recommended smart lock for UK French doors, as it is designed for single-point Euro-cylinder operation. The Nuki 3.0 Pro (£179) also works if the door has a standard Euro cylinder and a flat mounting surface. French doors often have a narrower stile (frame edge) - check that the lock body does not overhang the edge. The minimum stile width for the Yale Conexis L2 is 75 mm. Most UK French doors are made from uPVC or timber. Multi-point locking variants exist but are less common - the smart lock will only control the main deadbolt, leaving top/bottom bolts to be operated manually.

Fitting Considerations and Security Tips¶

When fitting a smart lock to French doors, the most important step is checking the alignment of the active leaf. French doors are prone to sagging over time, which can cause the deadbolt to miss the strike plate. Measure the gap between the door edge and frame - it should be 3 - 4 mm. If it is greater than 6 mm, adjust the hinges before installing the lock. The Ultion Keyturn WiFi (£279) includes a reinforced strike plate that provides extra hold force for French doors. For timber French doors, use the Yale Conexis L2 with its included timber door kit. Ensure the passive leaf bolts are engaged before fitting - some users report that vibration from the smart-lock motor can cause passive bolts to rattle loose over time.

Specifications and Comparison¶

Brand	Model	Suitable for French Doors	Min Stile Width	Price (£)
Yale	Conexis L2	Yes	75 mm	199
Nuki	3.0 Pro	Yes (check surface)	70 mm	179
Ultion	Keyturn WiFi	Yes (with strike kit)	80 mm	279
Lockly	Secure Plus	Limited	85 mm	249

FAQ¶

Can I fit a smart lock on both leaves of French doors?: Technically yes, but it is rarely necessary. Fit one smart lock on the active leaf and use manual bolts on the passive leaf for cost-effectiveness.
Will a smart lock work on French doors with a multi-point lock?: Yes, but the smart lock controls only the central deadbolt. Top and bottom hooks remain manual unless you install a motorised multi-point system.
Are French doors more difficult to smart-lock than standard doors?: Slightly - alignment is critical due to the dual-leaf design. Professional installation is recommended if the door has sagged or if the stile is narrow. For more information see our Smart Lock for uPVC Doors UK.

Last updated: 2026-05-31.

External Resources¶

For further information consult authority guidelines at the Electrical Safety First.