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

5.0 (1 review)
£44.99 SKU: HS13472
£44.99
Order by 2pm for same-day dispatch
Eye visibility icon in black, representing monitoring, visibility, or visual deterrence, displayed on a transparent background.

Same-day dispatch on orders before 2pm

Fully tracked 2 working-day courier

Will it fit?
  • Fits on the inside of uPVC, composite and timber doors, over the letterbox.
  • Measured from inside the door, your letterbox opening should be no bigger than 315mm wide × 80mm high. Treat that as the upper limit.
  • The cover is 400mm wide × 100mm high, so check nothing (like the handle) is in the way.
  • Screws or self-adhesive pads, both included. Suitable for fire-rated doors.
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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.

It fits on the inside of uPVC, composite and timber doors. Measured from inside the door, your letterbox opening should be no bigger than 315mm wide × 80mm high. Check the size guide in the photos before you order.

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.
FlapGUARD lockable letterbox security cover in white fitted to a white front door. One cover, total protection. Fits most standard UK letter plates. Also shown: Four features of the FlapGUARD letterbox cover: locks shut, anti-arson and anti-fishing protection, protects the home, simple to fit.FlapGUARD lockable letterbox security cover in white fitted to a white front door. One cover, total protection. Fits most standard UK letter plates.
Four features of the FlapGUARD letterbox cover: locks shut, anti-arson and anti-fishing protection, protects the home, simple to fit.
FlapGUARD cover lifted open on a white door showing the letter plate behind it. Prevents letterbox fishing, reduces the risk of arson, easy DIY installation.FlapGUARD cover lifted open on a white door showing the letter plate behind it. Prevents letterbox fishing, reduces the risk of arson, easy DIY installation.
Complete letterbox security: FlapGUARD comes complete with fixing screws, self-adhesive pads and locking knobs, no additional parts needed.Complete letterbox security: FlapGUARD comes complete with fixing screws, self-adhesive pads and locking knobs, no additional parts needed.
Designed to fit most standard UK letter plates: FlapGUARD sizing and fitting guide.Designed to fit most standard UK letter plates: FlapGUARD sizing and fitting guide.
FlapGUARD lockable letterbox cover shown in use on a front door.FlapGUARD lockable letterbox cover shown in use on a front door.
Home Secure, The Security Specialists. Trusted by thousands of UK customers for practical, dependable security solutions designed for everyday use.Home Secure, The Security Specialists. Trusted by thousands of UK customers for practical, dependable security solutions designed for everyday use.
Product overview

FlapGUARD is a lockable steel cover that fits on the inside of your door, over the letterbox. It stops anyone reaching or fishing through the letterbox for keys or the door handle, and makes it harder to push lit materials or fireworks through. Post still comes through its 315 × 80mm opening, even when it's locked.

Security

  • Steel, with a white finish
  • Sold Secure Domestic Bronze when fitted with the supplied screws
  • Turn the knob to lock or unlock it
  • Suitable for fire-rated doors

Will it fit my door?

  • Doors: uPVC, composite and timber
  • Overall size: 400mm wide × 100mm high × 20mm deep
  • Mail opening: 315mm wide × 80mm high
  • Your letterbox: measured from inside the door, the opening should be no bigger than 315mm wide × 80mm high. Treat that as the upper limit: depending on where the fixings sit, the largest letterbox it fits may be a little smaller.

Fitting

Fix it over the inside of your letterbox with the four 20mm screws or the self-adhesive pads. Both are supplied. Use the screws if you want the Sold Secure rating. All you need is a screwdriver.

FlapGUARD or the letterbox bag?

Most worried about someone reaching through for your keys? FlapGUARD is a lockable steel barrier. Most worried about arson or fireworks? The fire-retardant letterbox bag catches your post and can contain small fires.

In the box

  • 1 × FlapGUARD lockable letterbox security cover
  • 4 × fixing screws (20mm)
  • Self-adhesive fitting pads
  • Locking knobs
  • Installation instructions
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 2pm (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