Crime Prevention at Home

Mortise deadlock

Mortise locks fit into a slot cut into the edge of the door and usually can only be opened with a key.
These should be upgraded to 5-lever locks tested to BS: 3621. This is usually a minimum insurance requirement.
The locks are based on a range of standard measurements so, with careful matching, replacement is easy.
A deadlock means a thief can’t smash a nearby glass panel to open the door from the inside or, having entered through a window, cannot carry your belongings out through the door.

Rim lock or Night latch

A rim lock is screwed to the face of the door and latches automatically when you close the door unless held open with the snib.
Unless it also has the term deadlock attached, it can be opened by turning a knob.
Rim locks should be tested to BS:3621

Automatic deadlocking rim lock

This locks automatically when the door is closed and is more secure than other types of rim latch.
It needs a key to open it from both the inside and the outside and should meet BS: 3621.
Ideally both types of lock should be fitted to a door at roughly one third spacing.
Both being used to secure an empty home and just the night latch use during occupancy.

Multi-point locking

These involve several hooks or bolts holding the door into the frame.
The lock cylinders should be tested to BS EN 1303 Grade 3 and can be replaced.
If your door is BS: PAS24 and it requires replacement locks ensure they are changed like for like to continue the level of security.

ACPO CPI