Letterbox Security: The Complete Guide to Protecting Your Front Door

Your letterbox might seem harmless, but it's actually one of the most exploited vulnerabilities in home security. Criminals use letterboxes for key fishing (hooking keys through the flap), arson attacks (pushing flammable materials through), snooping (peering inside to check if anyone is home), and manipulating internal locks.

A letterbox guard — also called a letterbox cage or letterbox basket — is the most comprehensive solution. It's a metal frame that fits behind the letterbox on the inside of the door, creating a secure enclosure that allows post to be delivered but prevents anyone from reaching through with hands or tools.

A letterbox restrictor plate limits how far the flap can be opened from outside. This prevents hands and most tools from being inserted while still allowing normal post delivery. Some restrictors include a draught-proof brush seal that also helps with insulation.

Fireproof letterboxes and internal fire-retardant bags protect against arson attacks by containing any material pushed through the letterbox. These are particularly important for properties that have been threatened or are in areas where arson attacks on letterboxes have occurred.

For maximum security, position your letterbox in the lower third of the door rather than at handle height. This makes it much harder for someone to reach up to the lock or handle. If your current letterbox is at handle height, fitting a guard or restrictor is essential.

Oldham Locksmiths supplies and fits letterbox guards, restrictors, and security plates across Oldham. Call 07949 139 475 for fitting.