A letterbox draught excluder is a brush cover or flap fitted over the letter plate to cut cold air whistling through the front door.
Prices checked on Amazon UK, 27 October 2026.
A letterbox draught excluder is a brush cover or flap fitted over the letter plate to cut cold air whistling through the front door. Internal PVC and metal brush covers are the usual UK fix; some include a hinged flap as well as bristles. This guide compares letterbox draught excluders on Amazon UK using size and material claims from each listing. Measure your letter opening before you buy — widths differ between PVC and metal models. We found 8 letterbox draught excluders in stock on Amazon UK with a live buy-box price when we checked on 27 October 2026. Our overall pick is the Stormguard Metal Letterbox Brush Cover at £14.99, the budget pick is the Stormguard PVC Letter Box Brush Cover White at £5.99, and our pick Exitex flap seal is the Exitex Letterbox Draught Excluder Flap at £16.99. Prices and stock change often, so check both on Amazon before you buy.
Quick comparison
| Product | Price | Best for | Width (listing) | Material | Brush / flap | Internal / external | Colour |
|---|---|---|---|---|---|---|---|
| Stormguard Metal Letterbox Brush Cover | £14.99 | Overall metal | 293 x 77 mm | Metal | Brush + cover | Internal | Black |
| Stormguard PVC Letter Box Brush Cover White | £5.99 | Lowest price | ~335 mm (listing) | PVC | Brush cover | Internal | White |
| Exitex Letterbox Draught Excluder Flap | £16.99 | Flap + bristle | – | – | Flap & bristle | – | Black |
| Merriway StormSeal Letter Box Brown | £6.49 | Brown PVC | – | PVC | StormSeal | – | Brown |
| Internal Letterbox Draught Excluder 13.5in | £8.99 | 13.5in PVC | 13.5 in / 34.2 cm | PVC | Letter plate seal | Internal | – |
| Letter Box Flap 11.5in with Brush Silver | £8.99 | 11.5in silver | 11.5 in | – | Flap + brush | – | Silver |
| Internal Letterbox Excluder 13.5in Alt | £9.49 | 13.5in PVC alt | 13.5 in / 34.2 cm | PVC | Letter plate seal | Internal | – |
| Letter Box Cover Brush & Flap Silver | £10.95 | Brush & flap silver | – | – | Brush & flap | Internal or external | Silver |
Specs from each Amazon UK listing (– = not stated on the listing); prices checked on Amazon UK on 27 October 2026.
Our picks
Stormguard Metal Letterbox Brush Cover
Stormguard Metal Letterbox Brush Cover
£14.99
Best overall
Stormguard PVC Letter Box Brush Cover White
Stormguard PVC Letter Box Brush Cover White
£5.99
Best budget
Exitex Letterbox Draught Excluder Flap
Exitex Letterbox Draught Excluder Flap
£16.99
Best for families
How we pick
We shortlist products sold on Amazon UK using capacity, features, customer ratings and price band. We do not lab-test every model unless a page says so. The Amazon page is the live price. How we recommend.
Compare at a glance
| Product | Last Amazon price | Buy |
|---|---|---|
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£14.99
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£5.99
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£16.99
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£6.49
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£8.99
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£8.99
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£9.49
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£10.95
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The products
Buying advice
Our top picks
Best overall: Stormguard Metal Letterbox Brush Cover (£14.99). Stormguard internal metal mailbox brush case with cover, black, about 293 × 77 mm on the listing. Sturdy metal overall pick.
Best budget: Stormguard PVC Letter Box Brush Cover White (£5.99). The cheapest pick here. Stormguard internal PVC letter box brush cover in white; external dimensions about 335 mm on the listing.
Best with flap: Exitex Letterbox Draught Excluder Flap (£16.99). Exitex letterbox draught excluder with flap and bristle seal in black on the listing. Flap plus brush for a stronger seal.
Other letterbox draught excluders worth a look
Merriway StormSeal Letter Box Brown (£6.49). Merriway BH05981 StormSeal letter box draught excluder in brown PVC on the listing.
Internal Letterbox Draught Excluder 13.5in (£8.99). Internal letterbox draught excluder 13.5 inch (34.2 cm) PVC letter plate seal on the title.
Letter Box Flap 11.5in with Brush Silver (£8.99). Letter box flap 11.5 inch with brush, silver finish on the title.
Internal Letterbox Excluder 13.5in Alt (£9.49). Another 13.5 inch (34.2 cm) PVC internal letterbox draught excluder / letter plate seal on the title.
Letter Box Cover Brush & Flap Silver (£10.95). Letter box cover with brush and flap for internal or external use, silver finish on the listing.
Measure first
Check the outer size of your existing letter plate and the hole in the door. PVC covers and metal cases are not always interchangeable.
Internal fits are the most common DIY upgrade; only use external-rated covers outdoors as the listing states.
Brushes and flaps
Bristles slow airflow while still letting post through. A hinged flap adds another barrier when the door faces wind.
Keep brushes clear of jammed mail so the seal still closes.
What to look for in a letterbox draught excluder
Width and height that match your letter plate.
PVC versus metal frame.
Brush-only versus brush plus flap.
Internal versus external use.
Colour to match your door furniture.
Fixings included or screws you already have.
How we chose these picks
We only included products that were in stock on Amazon UK with a single live buy-box price in pounds when we checked on 27 October 2026, read with a UK delivery address. We skipped listings showing low stock, no stock line or unclear details, and we avoided repeating products already featured in our other guides. Specs in the comparison table come from each product's Amazon UK listing, and a dash means the listing does not state that detail. Descriptions are based on what each listing says; we have not tested these products ourselves, and we have not used star ratings or review counts.
Prices were checked on Amazon UK on 27 October 2026 and can change at any time. Check the current price, details and delivery date on Amazon before you order.
Frequently asked questions
How to fit letterbox draught excluder?
Most internal covers screw over the existing letter plate from inside the hall. Offer the cover up, mark holes, and fix with the screws supplied or suitable wood screws. Keep the brushes clear of the moving flap.
How to stop draught from letterbox?
Fit an internal brush cover or flap seal sized to your plate, and check the door itself for gaps at the bottom. A letterbox excluder is the usual first step for post-slot draughts.
Do letterbox brushes go inside or outside?
Most UK brush covers in this guide are for internal fitting. Some covers say internal or external on the listing — only fit outside if the product is rated for it and your door design allows.
