Protect Your Home with FlapGUARD — The Lockable Letterbox Security Cover

FlapGUARD is a premium lockable letterbox security cover designed to protect your property from unauthorised access, letterbox fishing, and arson attacks through your front door's letter plate.

Made from strong steel and independently accredited to the Sold Secure Domestic Bronze standard, FlapGUARD gives homeowners, landlords, and businesses genuine peace of mind — without disrupting normal mail delivery.

Why Thousands of UK Homes Trust FlapGUARD

Prevents Letterbox Fishing & Theft Letterbox fishing is one of the fastest-growing methods of burglary in the UK. Criminals use hooks and rods pushed through the letter slot to steal keys, wallets, and mail from inside your hallway. FlapGUARD's internal steel barrier blocks this access completely, keeping your valuables safe.

Reduces the Risk of Arson & Dangerous Items From lit materials to fireworks, letterboxes are a known vulnerability — particularly during winter months and bonfire night. FlapGUARD helps prevent dangerous objects from being pushed through your door, offering an extra layer of protection for your family and property.

Normal Mail Delivery Continues Unlike letterbox blanking plates that block all post, FlapGUARD is designed with a generous 315mm × 80mm opening that allows standard letters and small mail items to pass through freely — even while the unit is locked. You stay protected without missing a delivery.

Sold Secure Bronze Accredited FlapGUARD has been independently tested and certified by Sold Secure, one of the UK's most respected security testing bodies. When installed with the included fixing screws, it meets the Sold Secure Domestic Bronze standard — a mark of quality recognised by insurers and police forces across the country.

Quick & Easy DIY Installation — No Specialist Tools Required

FlapGUARD is supplied with everything you need for a quick, hassle-free installation:

4 × fixing screws (20mm)
Self-adhesive pads for non-drill fitting
Locking knobs included
Step-by-step fitting instructions

Simply position the unit over the inside of your existing letter plate, secure with screws or adhesive pads, and you're done. The whole process takes just minutes using a standard screwdriver. FlapGUARD is also suitable for fire-rated doors.

Dimensions & Compatibility

Overall Size: 400mm wide × 100mm high × 20mm deep
Mail Opening: 315mm wide × 80mm high
Material: Steel with durable white finish
Fitting: Screws or self-adhesive pads (both included)
Compatibility: Fits most standard UK letter plates on uPVC, composite, and timber doors

Who Is FlapGUARD For?

Homeowners looking to protect against letterbox crime, especially in high-risk areas or during darker months
Landlords & letting agents who want a quick, affordable security upgrade between tenancies
Businesses, offices & HMOs where front door security is a priority
Vulnerable residents and those referred by local police or fire services for letterbox security measures

What's in the Box?

1 × FlapGUARD lockable letterbox security cover
4 × fixing screws (20mm)
Self-adhesive fitting pads
Locking knobs
Installation instructions

Part of the Home Secure Range

Trusted by thousands of UK customers for reliable, practical home security products including window handles, door security, and letterbox protection.

Letterbox Security | Anti-Fishing Visor & Fire-Retardant Mail Bag – Home Secure

Letterbox Cowl Visor Guard Extra Security Cover - White – uPVC & Composite Doors

Fire Proof Retardant Letterbox Bag. Internal Letter Box Security Cover – uPVC & Composite Doors

FlapGUARD Lockable Letterbox Security Cover — Anti-Arson & Anti-Fishing Letter Plate Guard