A non tested night latch can be used for access but it must be supported with a tested lock so you would have two locks on the door.
Locking systems for wooden doors.
The best lock for a wooden door is a lock that meets the requirement of bs3621 the type of lock fitted can be a night latch mortice deadlock or mortice sash lock.
Available 3 point locking door hardware systems for all exterior wood door sizes door heights and door swings.
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Prime line gd 52118 inside deadlock heavy duty galvanized housing fits most garage doors for extra protection as a security lock 7 8 x 1 8 steel 4 6 out of 5 stars 604 9 85 9.
3 point locking systems help to prevent warping for taller wood doors and ensures weather tightness.
Burglabar 2 pack great for sliding patio door lock use 2 for doors sliding window lock sliding basement windows lock child safety lock 4 3 out of 5 stars 1 264 11 95 11.