White FlapGuard lockable letterbox security cover with side locking knob, designed to prevent unauthorised access through door letterboxes.
FlapGuard lockable letterbox security cover installed on a white front door with Sold Secure Bronze certification badge.
FlapGuard size diagram showing front and side measurements for a letterbox security guard, including 400mm overall width, 315mm opening width, 100mm overall height, 80mm opening height, and 20mm depth. Includes illustration of supplied 20mm screws and self-adhesive pads with the text “Please check our size guides”.
FlapGuard letterbox security cover benefits graphic showing a white flap guard installed on a front door. Highlights include enhanced letterbox security, reduced arson and fishing risk, and easy installation with only four screws. Includes close-up image demonstrating the turn lock/unlock feature and a full installed view on a white door.
White letterbox flap guard installed on a front door beside a black handle, designed to improve home security and prevent letterbox access. Text overlay reads “MAKE YOUR HOME SECURE”.
FlapGuard suitable doors guide showing compatibility with timber, composite, and uPVC doors. Includes reminder to check letterbox width and height for correct size compatibility.
White FlapGuard lockable letterbox security cover with side locking knob, designed to prevent unauthorised access through door letterboxes.
FlapGuard lockable letterbox security cover installed on a white front door with Sold Secure Bronze certification badge.
FlapGuard size diagram showing front and side measurements for a letterbox security guard, including 400mm overall width, 315mm opening width, 100mm overall height, 80mm opening height, and 20mm depth. Includes illustration of supplied 20mm screws and self-adhesive pads with the text “Please check our size guides”.
FlapGuard letterbox security cover benefits graphic showing a white flap guard installed on a front door. Highlights include enhanced letterbox security, reduced arson and fishing risk, and easy installation with only four screws. Includes close-up image demonstrating the turn lock/unlock feature and a full installed view on a white door.
White letterbox flap guard installed on a front door beside a black handle, designed to improve home security and prevent letterbox access. Text overlay reads “MAKE YOUR HOME SECURE”.
FlapGuard suitable doors guide showing compatibility with timber, composite, and uPVC doors. Includes reminder to check letterbox width and height for correct size compatibility.
Home Secure

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

£44.99 SKU: HS13472
Order by 2pm for same-day dispatch
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Same-day dispatch on orders before 2pm

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.

Key benefits
  • Helps Prevent Letterbox Theft - Reduces the risk of thieves reaching through your letterbox to steal keys, mail, and valuables.
  • Lockable for Extra Security - Securely locks in place to provide added protection for your home.
  • Easy to Fit - Quick to install on most uPVC, composite, and timber doors using the supplied fixings.
Product overview

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.
Delivery & Returns

How much is delivery?

UK Mainland Delivery is £2.99 on all items no matter how many you order!

Northern Ireland, Scottish Highlands, Channel Islands £6.00.

We do not offer International Delivery (Ireland, France, Spain etc).

When will my order be dispatched?

Orders before 3pm (Monday to Friday) are usually dispatched same day but may take up to 24 hours.

When will I receive my item?

We ship on 2 working day courier. Fully Tracked. Tracking will be emailed on dispatch. 

Special order items such as keyed alike locks will take longer to dispatch. Please refer to product description for lead times. 

I haven't received my item?

Please email us your name, order number and date of purchase.

We prefer email as it allows us time to research and respond.

Returns Information

We operate a 30 day refunds and return policy. 

If you change your mind you must return the product back to us within 30 days of delivery

Please include a copy of your invoice and a note stating reason for return. 

Additional keys, locks keyed alike or built to code are non refundable as they are personalised made to order goods.

Any refund, which is due to a fault or other defect, will include a refund of the applicable delivery charges otherwise not. 

It is the buyers responsibility to arrange the return of goods to us. We do not offer a collection service for returning items. 

Items must be returned including original product packaging and accessories.

We reserve the right to refuse any returns that do not comply with this policy.

Please post returns to the following address:

Home Secure (Online)

Unit 5, Brookfield Drive

Liverpool, L9 7AJ

United Kingdom

Frequently Asked Questions

A Flapguard lockable letterbox security cover is designed to prevent mail theft and unauthorised access through your letterbox. It adds an extra layer of protection by covering the internal opening, helping to stop fishing attacks and burglar attempts.

This security cover acts as a barrier behind your letterbox, preventing intruders from reaching inside your property. It helps protect keys, door handles, and locking mechanisms from being tampered with through the letterbox.

The Flapguard is designed to fit most standard letterboxes, including uPVC, composite, and wooden doors. However, it’s always recommended to check the dimensions and compatibility before installation.

Yes, this model is lockable, allowing you to securely control access to your mail. The locking feature adds an extra level of protection, especially useful when you are away from home for extended periods.

Yes, the Flapguard lockable letterbox cover is designed for straightforward installation. It typically comes with all necessary fixings and can be fitted with basic tools, making it suitable for DIY installation.