Auto Deadlocking Nightlatches

A front door that only catches on the latch is an easy target — and a nuisance when you are dealing with a worn or unreliable lock. An auto-deadlocking nightlatch solves both problems by throwing the deadlock as soon as the door closes, rather than relying on someone remembering to lock up behind them. It is a sensible choice for timber external doors on homes, flats and smaller commercial premises where straightforward, dependable security matters.

This category includes replacement auto-deadlocking cylinder nightlatches from recognised names such as Yale, Union, ERA, Asec and Ingersoll. If you are replacing an existing rim lock, check the backset, cylinder type and handing before ordering; matching the case and cylinder arrangement saves an unnecessary return visit. Case-only options are also available where the cylinder is still serviceable.

For doors where insurance approval is part of the job, choose a British Standard nightlatch to BS3621. These higher-security rim locks are commonly paired with a 5-lever deadlock that meets insurance requirements, giving a traditional external timber door both automatic locking and a separate deadbolt for overnight or longer-term security. It is not the same setup as replacement cylinder locks for UPVC doors, which generally use a multipoint mechanism — nightlatches are surface-mounted rim locks designed for doors with the right construction and clearance.

Keyless-egress models to BS8621 are worth considering where occupants need to leave quickly without a key, such as certain shared entrances or managed buildings. For everyday front-door replacement work, an auto-deadlocking nightlatch remains one of the most practical ways to restore security after a failed, dated or damaged rim lock.