Best Letterbox Draught Excluder UK (2026): Stop the Howling Slot
Internal brush+flap covers vs full sleeved letterplates — measure first, then pick the right UK fix
Quick answer
Best letterbox draught excluder UK: Exitex Internal Letterbox Draught Excluder with Flap & Bristle Seal (Black) B005DR1VG2 — spring flap plus bristles for windy UK fronts. Gold finish alt: Exitex B007SLBH2O. Budget PVC cover: Stormguard White B009YLSKVM. Metal brush plate (no flap emphasis): Stormguard B07MQF9KHQ. Full sleeved letterplate replacement: Keypak 12" B0CHSGD929.
Looking for the best letterbox draught excluder UK front doors actually need this winter? Our #1 pick is the Exitex Internal Letterbox Draught Excluder with Flap & Bristle Seal (Black) — spring flap plus bristle seal in an aluminium-look plate that screws inside in minutes.
This is a letterbox-aperture spoke, not a clone of our all-gap [best draught excluders UK](/best-draught-excluders-uk) hub. We compare internal covers vs full sleeved letterplates, flap+bristle vs brush-only PVC, and budget vs period finishes — not under-door snakes or window foam. Under-door draught on timber? See [best draught excluder for wooden doors UK](/best-draught-excluder-for-wooden-doors-uk). Cold hallway on a budget? Read [the £12 hall fix](/articles/draught-hallway-cheap-fix-uk). Seal the slot first, then spot-heat with our [best oil-filled radiators UK](/best-oil-filled-radiators-uk) guide if the hall still feels cold.
£55
Typical annual savings EST cites for draught-proofing windows and doors — editorial context for whole-home draught-proofing, not letterbox-only
Editor's Choice
Exitex Internal Letterbox Draught Excluder with Flap & Bristle Seal (Black)
The letterbox #1 — deepest review history in the category; flap+bristle beats brush-only PVC on windy UK fronts. Measure centres first; a few durability complaints on plastic hinge parts — check fit and returns.
Diagnose your problem
How to Choose a Letterbox Draught Excluder (UK)
Measure fixing centres and aperture first — then decide cover-only vs full letterplate replacement.
Problem
Measure before you buy
Fixing centres (hole-to-hole), overall plate size, aperture width × height, and door thickness if buying a sleeved plate
Recommendation
Exitex-class covers are roughly 274 mm fixing centres and ~293 × 75 mm overall — confirm on the listing before ordering
Products
Problem
Internal cover vs full sleeved letterplate
Keep the existing external plate, or replace the whole through-door assembly
Problem
Flap + bristles vs brush-only
Windy exposed front doors vs mild internal draughts
Recommendation
Windy exposed doors → spring flap + bristles (Exitex). Mild draught / tight budget → brush cover (Stormguard white PVC)
Products
Problem
Renting vs owning
Permission to drill and whether you can swap the whole letterplate
Recommendation
Renters: prefer reversible internal screw covers; ask before drilling ornate doors. Owners: sleeved Keypak replacement OK if the letterplate is failing
Products
Problem
Period / gold finish
Brass or gold external plates where black aluminium looks wrong
Recommendation
Exitex Gold B007SLBH2O — same flap+bristle family in a period-friendly finish
Products
Problem
When NOT to buy
Draught is under the door, unused chimney, or intentional ventilation
Recommendation
Under-door gap → wooden-doors spoke or hub under-door picks. Unused chimney → hub chimney balloon. Never block gas-appliance ventilation vents
Products
Professional advice recommended
Quick Picks
The best letterbox draught excluder for every UK front door
Our Top 5 Picks
Compare all
Exitex
Exitex Internal Letterbox Draught Excluder with Flap & Bristle Seal (Black)
“The letterbox #1 — deepest review history in the category; flap+bristle beats brush-only PVC on windy UK fronts. Measure centres first; a few durability complaints on plastic hinge parts — check fit and returns.”
Best for
Standard UK front-door letterboxes — spring flap + bristle, 5-min screw-fit
Pros
- +Spring flap plus bristle seal for exposed front doors
- +Aluminium-look plate with fixings included
- +Same Exitex family the hub already trusts
- +Post still passes — bristles slow large packets only slightly
Cons
- −Must measure fixing centres (~274 mm class) before ordering
- −Screw-fit internal — not for no-drill rentals without permission
- −Some buyer reports of plastic hinge wear over time
All specifications
| Type | Internal letterbox cover |
| Fixing centres | ~274 mm |
| Overall size | ~293 × 75 mm |
| Aperture (bristles) | ~255 × 40 mm |
| Installation | Screw-fixed inside door |
Exitex
Exitex Letterbox Draught Excluder (Gold)
“Best period / gold finish — same trusted Exitex mechanism in a colour that suits brass letterplates and Victorian front doors.”
Best for
Brass/gold external plates where black aluminium looks wrong
Pros
- +Gold finish suits brass/gold external letterplates
- +Same flap+bristle seal as the black Exitex winner
- +Often slightly cheaper observed band than black on Amazon UK
Cons
- −Still requires screw fixing and centre measurement
- −Gold finish may not match every brass plate exactly
- −Same hinge durability caveats as the black variant
All specifications
| Type | Internal letterbox cover |
| Finish | Gold |
| Family | Exitex flap + bristle |
| Installation | Screw-fixed inside door |
Stormguard
STORMGUARD White Letterbox Cover Draught Excluder with Brush
“Best budget PVC cover — cheaper build than Exitex aluminium but a real draught cut for light wind when you cannot justify premium spend.”
Best for
Renters / lowest spend; white PVC internal cover with brushes
Pros
- +Lowest observed price band in the category
- +White PVC suits painted internal doors
- +Brush seal blocks light draughts and dust
- +Internal screw-fit — reversible if tenancy allows
Cons
- −Cheaper PVC build than Exitex aluminium
- −Brush-only — no spring flap for very windy exposed doors
- −Less durable long-term than metal Exitex family
All specifications
| Type | Internal PVC brush cover |
| Finish | White |
| Installation | Screw-fixed inside door |
Stormguard
Stormguard Letterbox Draught Excluder Seal Brush with Flap — Metal Weather Cover (No Flap, Black)
“Best metal brush cover — listing title says “No Flap” clearly, so flap-seekers should pick Exitex instead. Metal plate mid-price between PVC budget and Exitex premium.”
Best for
Buyers who want a metal brush plate; listing title includes “No Flap”
Pros
- +Metal weather cover — tougher than white PVC
- +Honest “No Flap” listing — know what you are buying
- +Stormguard UK brand with brush seal
Cons
- −No spring flap — windy doors may prefer Exitex
- −Title confusion risk if you skim-read “with Flap” in the name
- −Measure centres before ordering
All specifications
| Type | Metal brush letterbox cover |
| Flap | No flap (per listing title) |
| Finish | Black |
| Installation | Screw-fixed inside door |
Keypak
Keypak 12" (30.6 cm) Sleeved Door Letter Box — Anti-Snap Flap & Draught Excluder (40–80 mm doors)
“Best full sleeved letterplate — when the external plate is broken, anti-snap matters, or an internal cover cannot fix a failing unit. More DIY than Exitex screw-on cover.”
Best for
Replacing the whole letterplate on uPVC, composite or timber doors
Pros
- +Replaces whole letterplate — not just internal cover
- +Telescopic sleeve fits 40–80 mm door thickness
- +Integrated brushes and anti-snap flap
- +Suits uPVC, composite and timber doors
Cons
- −Full letterbox replacement — not a 5-min internal cover
- −Requires confidence cutting/drilling through-door holes
- −Alt colour sibling B09WF5R5PX exists — pick one primary card
All specifications
| Type | Full sleeved letterplate |
| Length | 12" (30.6 cm) |
| Door thickness | 40–80 mm |
| Installation | Through-door replacement |
Compare All Products
Side-by-side specs for quick decision-making
Swipe to compare →
| Product | Type | Fixing cen… | Price | Best For | Action |
|---|---|---|---|---|---|
| Internal letterbox cover | ~274 mm | £13–£17 | Standard UK front-door letterboxes — spring flap + bristle, 5-min screw-fit | View | |
 Exitex Letterbox Draught Excluder (Gold)Best Gold / Period Finish | Internal letterbox cover | — | £11–£15 | Brass/gold external plates where black aluminium looks wrong | View |
| Internal PVC brush cover | — | £5–£8 | Renters / lowest spend; white PVC internal cover with brushes | View | |
| Metal brush letterbox cover | — | £12–£16 | Buyers who want a metal brush plate; listing title includes “No Flap” | View | |
 Keypak 12" (30.6 cm) Sleeved Door Letter Box — Anti-Snap Flap & Draught Excluder (40–80 mm doors)Best Full Sleeved Letterplate | Full sleeved letterplate | — | £12–£18 | Replacing the whole letterplate on uPVC, composite or timber doors | View |
Ventilation & What Not to Seal
Never block intentional ventilation — airbricks, trickle vents, extractor fans or combustion-air openings for gas appliances. Only seal unintentional letterbox gaps. Check fixing centres and aperture size before ordering; a poor fit wastes money and may need returning. This guide is editorial DIY research, not a building survey or fire-safety certificate.
Research Methodology
How We Chose These Products
This is editorial research aimed at UK letterbox apertures, not laboratory air-leakage testing. We do not measure U-values, invent live prices, or claim controlled chamber results.
We review Amazon UK listings for internal letterbox covers, brush seals and sleeved letterplates; analyse verified UK buyer feedback (fit on standard UK doors, post delivery, hinge durability); compare manufacturer dimension claims; and weight criteria for windy UK front doors — flap+bristle vs brush-only, cover vs full replacement, and budget vs period finish. Reuse hub-trusted Exitex where the ASIN already appears on site.
Selection Criteria
Letterbox fit
30% weightFixing centres, aperture size, internal vs sleeved replacement suitability
Draught blocking
25% weightFlap+bristle vs brush-only; buyer feedback on windy exposed doors
Customer satisfaction
20% weightVerified UK reviews on install ease, post fit and durability signals
Install practicality
15% weightScrew-fit clarity, fixings included, renter reversibility
Value & availability
10% weightApproximate Amazon UK price band vs build quality and stock
Important Limitations
- •We have not laboratory-tested air leakage reduction on letterboxes
- •Manufacturer dimension claims vary — always measure fixing centres and aperture before buying
- •Star ratings and review counts are snapshots that change
- •Price bands are approximate observed bands (22 Sep 2026) — verify live Amazon UK price before buying
- •Some Exitex buyers report plastic hinge wear — check fit and returns policy; we do not invent failure rates
- •Full sleeved letterplates require more DIY confidence than internal covers
Research last conducted: · Price bands checked:
Frequently Asked Questions
People also ask about letterbox draught excluders (UK)
We pick the Exitex Internal Letterbox Draught Excluder with Flap & Bristle Seal (Black) B005DR1VG2 for most UK front doors. Gold finish alternative: Exitex B007SLBH2O. Budget PVC: Stormguard White B009YLSKVM. Full letterplate replacement: Keypak 12" B0CHSGD929.
They block a common cold-air path through the front door. The Energy Saving Trust cites around £55 per year for draught-proofing windows and doors across a typical UK home — that is a whole-home figure, not letterbox-only savings. Still worth fixing if you feel cold air through the slot.
Yes — bristles flex for standard post and small packets. Large parcels may need a firmer push; aperture must match your usual mail size. Posties are used to bristle seals on UK doors.
Internal cover (Exitex, Stormguard): screws inside, keeps your existing external plate — best for most upgrades. Full sleeved letterplate (Keypak): replaces the through-door unit when the old plate is broken, anti-snap is needed, or an internal cover cannot seal the gap.
Measure hole-to-hole on your existing internal plate or letterbox fixing points. Compare to the listing dimension — Exitex-class covers are roughly 274 mm centres. Also note overall plate size and aperture width × height.
Usually yes for internal screw covers if your tenancy allows minor fixes — they are reversible with small screw holes. Ask before drilling ornate doors or swapping a full letterplate. Budget Stormguard white PVC is the lowest-spend option.
Exitex = aluminium-look plate with spring flap plus bristles — best for windy exposed fronts. Stormguard white PVC = cheaper brush-only cover for mild draughts and tight budgets. Stormguard metal B07MQF9KHQ is brush-focused with “No Flap” in the title.
British English uses “draught”. Amazon listing titles often mix US “draft” spelling because sellers copy international copy — search either, but buy for your gap size and fixing centres.
Ready to stop the letterbox howl?
Our top pick — the Exitex flap+bristle internal cover — is the deepest-reviewed letterbox fix on Amazon UK. Measure fixing centres first.
View #1 Pick on Amazon UKDisclosure & Editorial Policy
Amazon Affiliate: TopMagpie is a participant in the Amazon Services LLC Associates Programme. We earn from qualifying purchases. This doesn't affect our editorial choices or the prices you pay.
No Lab Testing: We have not laboratory-tested these products. Recommendations are based on spec analysis, reviews, and editorial judgement.
Prices: Approximate bands, checked . Amazon prices change frequently – always verify the current price before purchasing. We do not invent live prices.
Data Source: The £55 figure is from the Energy Saving Trust — draught-proofing advice. Actual results vary based on your specific situation.
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