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Burglary Prevention Advice


  • Quality locks and bolts are only as strong as the door and the frame to which they are fitted.
  • Wooden doors should be solid and at least 44mm thick.
  • Check that the frame is well fixed, and if weak or rotten replace it.
  • Glass panels on or around doors are especially vulnerable, so it’s worth replacing them with laminated glass.
  • If you replace a door it is better to buy a new "door set" certified to British Standard PAS 24-1 'Doors of Enhanced Security'. Bought as a complete kit, this shows that the door, frame, locks and fittings have been attack tested.
  • BS:PAS24 door sets are available in different materials. Specify this standard if you are having replacement doors.
  • Remember to fit all security devices with strong screws or bolts.
  • If fitting locks to a standard door fit a 5-lever mortise lock tested to BS: 3621 plus a BS: 3621 night latch. Click here to see Lock section.
  • Before fitting locks to PVC-U or metal doors, check with the installer to make sure that this will not affect your warranty.

Click here to see a list of Installers

Patio doors
Patio doors are especially vulnerable to break-in by levering off the tracks.

  • When buying ask for the sliding section to be on the inside and for anti-lift blocks.
  • Multi-locking systems are recommended or have mortise security bolts with removable keys at the top and bottom of both doors.
  • Existing patio doors can be fitted with additional security bolts to stop lifting or forced entry.

Door viewer

  • If you don’t have a window in the door or a way of checking who is calling, fit a door viewer.
  • Look through this to identify callers before you open the door.

Door chains

  • These allow the door to be opened a short distance to allow checking of identification.
  • They can stop callers pushing their way in, but must be securely fixed to avoid screws being pulled out.
  • They do not contribute to security of a locked door against burglary.


  • Check that the door hinges are sturdy and secured with strong, long screws.
  • For added security, fit hinge bolts or security hinges.
  • These are inexpensive, help to reinforce the hinge side of a door against force and protect the hinge if your door opens outwards.


  • NEVER hang a spare key inside the letterbox. This is an obvious place that a thief will check.
  • Letterboxes should be at least 400mm (16 inches) from any locks.
  • Consider fitting a letterbox cage or other restrictor. This prevents thieves from putting their hands or gadgets through the letterbox and trying the latches from the inside.


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