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Burglary Prevention Advice


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 TS 007 or SS 312 - Diamond Standard 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.

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