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Best Keyhole and Letterbox Covers for a Weather-Tight, Secure Front Door
Keyhole and letterbox covers are small hardware, but they decide whether a front door keeps out rain, drafts and prying eyes. This roundup covers five picks: a solid brass privacy letterbox hood for period and solid-wood doors, modern metal mail slot plates for a clean replacement, and a swinging brass keyhole cover for the classic escutcheon look. Budget-conscious renters and DIY installers will find a cheap fix, while owners restoring a timber door will lean toward the heavier brass pieces. The overview below puts every pick side by side before the individual reviews.
Overview of the Picks
| Product | Key Spec | Best Use | Price Tier |
|---|---|---|---|
| Deltana MSH158U3 Solid Brass Letter Box Hood | Solid brass, privacy hood | Period and solid-wood front doors | Premium |
| Mail Slot Plate for Front Door, 13 x 3.6 Inch | Rust-resistant, matte black | Quick modern slot replacement | Budget |
| STORMGUARD Internal PVC Letter Box Brush Cover | PVC with brush seal, white | Draught and weather sealing indoors | Budget |
| Ribbed Brass Keyhole with Swinging Cover 2 Inch | Ribbed brass, swinging cover | Classic keyhole privacy | Budget |
| Stainless Steel Front Door Mail Slot, 13 x 3-5/8 | Stainless steel, matte black | Heavy-traffic modern doors | Mid-range |
Deltana MSH158U3 Solid Brass Letter Box Hood
Material: Solid brass
Finish: Living brass tone
Type: Letter box hood for privacy use
Mounting: Pairs with MS211 and MS212 slot hardware
Best for: Timber and period doors
Deltana MSH158U3 MS211 and MS212 Solid Brass Letter Box Hood for Privacy Use with MS0030
This is the heavyweight of the group. The hood is cut from solid brass rather than stamped steel, so it holds its shape and develops a patina instead of flaking. It is designed as a privacy hood, meaning it shields the slot from the outside so a passer-by cannot see light or movement through the opening. It pairs with Deltana’s own MS211 and MS212 slot components, which makes it the pick for anyone already using that hardware family. Buyers fitting it to a painted or varnished timber door get the most from it, because the brass reads as a deliberate period detail rather than a utility add-on.
The premium is the point here: solid brass costs more than plated steel, and the finish is meant to age in place. It suits restoration projects, older homes and anyone replacing a tired hood on a door that deserves proper hardware. It is not the pick for a quick budget refresh on a uPVC door, where a cheaper plate does the job. Trade-off: The solid brass build carries the highest price in the group, and the hood needs matching slot hardware to look complete.
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Mail Slot Plate for Front Door, 13 x 3.6 Inch
Material: Rust-resistant metal
Finish: Matte black
Type: Letter slot plate
External size: 13 x 3.6 inches
Style: Modern door hardware
Best for: Straightforward slot replacement
This plate is the simple, modern answer to a worn or missing letter slot. The rust-resistant finish is the key claim, and it matters on an exterior door where moisture sits on the metal through winter. At 13 x 3.6 inches it is sized for standard mail and magazines, and the matte black reads as a clean contemporary detail on a dark or composite door. It is a plate rather than a hooded cover, so it sits flatter against the door face and suits doors where a bulky surround would look out of place.
It earned its place as the budget modern pick: a straightforward swap for anyone replacing a broken slot without changing the door. It suits DIY installers and renters who want a tidy finish at low cost. It is not the right choice for a period property where a brass hood is the intended look, or for a door that needs a deep draught seal. Trade-off: The flat plate offers less shielding from wind-driven rain than a hooded design, and the finish is unlikely to age as gracefully as solid brass.
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STORMGUARD Internal PVC Letter Box Brush Cover, White
Material: PVC with aluminium
Colour: White
Type: Internal brush cover
External dimensions: 335mm x 75mm
Aperture: 279mm x 45mm
Best for: Draught and weather sealing from inside
This is the sealing specialist of the five. The brush strip sits against the flap opening and blocks the cold draught and fine rain that a bare slot lets through, and it mounts on the inside face of the door. The PVC body with an aluminium element keeps it light, and the white finish disappears against a white or pale internal door panel. The stated external dimensions and aperture give a clear guide for checking the existing cut-out before ordering, which is the main thing to verify on a retrofit.
It suits anyone whose complaint is a draught or a rattle rather than appearance, and it is the cheapest practical fix in the group. It is not a decorative exterior piece and will not improve the look of the door from the street. Trade-off: The brush seal reduces draughts but adds slight resistance to mail passing through, and the white PVC is a purely functional look that will not suit every interior.
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Ribbed Brass Keyhole with Swinging Cover 2 Inch
Material: Brass
Finish: Bronze
Type: Keyhole escutcheon with swinging cover
Size: 2 inch
Profile: Ribbed
Best for: Classic keyhole privacy
Ribbed Brass Keyhole with Swinging Cover 2 Inch (Bronze)
The swinging cover is the whole point of this piece. It drops over the keyhole when no key is inserted, keeping out rain, dust and insects and stopping anyone from peering through. The ribbed profile gives it a traditional, slightly decorative look that suits older doors and furniture far better than a plain disc. Brass with a bronze finish is a sensible pairing for a period door, and the 2 inch size is a common escutcheon scale for standard keyholes.
It is the pick for anyone restoring a timber door, a shed or a piece of furniture who wants the keyhole to match the rest of the brasswork. It is not for a modern door with an integrated cylinder, where the cover would not fit the hardware. Trade-off: The swinging flap is a small moving part that can work loose or rattle over time, and the bronze finish needs occasional cleaning to keep its tone.
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Stainless Steel Front Door Mail Slot, 13 x 3-5/8
Material: Stainless steel
Finish: Matte black
Type: Front door mail slot
Size: 13 x 3-5/8 inches
Pack: 1
Best for: Heavy-traffic modern doors
Stainless steel is the practical upgrade over plated metal for a door that takes daily deliveries. It resists rust and pitting better than a coated steel plate, and the matte black keeps the look current rather than industrial. The 13 x 3-5/8 inch size is a close match to the standard slot opening, so it works as a direct replacement on many doors. It is supplied as a single pack, which suits one door and one opening.
It earned its place as the mid-range pick for busy households that want the slot to last without paying brass-hood money. It suits modern composite and steel doors and anyone replacing a rusting plate. It is not for period properties where the stainless look clashes, and it is not a draught seal on its own. Trade-off: The plate does not include a brush or flap seal, so a draughty door will still need a separate internal cover to stay warm.
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Before You Buy
- Material: Solid brass and stainless steel last longest outdoors; coated and PVC pieces are cheaper but age faster in wet weather.
- Size: Measure the existing cut-out, not the old plate. Match the stated external dimensions and aperture to the opening before ordering.
- Compatibility: A hood or escutcheon may need matching slot or lock hardware, so check the existing fittings first.
- Function: A flat plate improves looks; a brush or hooded cover is what actually blocks draughts and rain.
- Care: Brass develops a patina and can be polished or left; stainless and coated finishes need only a wipe.
- Included accessories: Most picks are single plates or covers, so screws and seals may need to be sourced separately.
- Door type: Match the finish to the door — brass for timber and period, matte black for modern composite and steel.
Frequently Asked Questions
-
Do letterbox covers stop draughts?
Only the ones with a seal. A brush cover or a hooded design blocks air movement; a flat plate mostly improves appearance. -
Can a keyhole cover be fitted to an existing door?
Yes, if the escutcheon matches the keyhole position and size. The swinging cover is a direct replacement for a plain surround. -
Is solid brass worth the extra cost?
On a period or timber door, yes — it holds up outdoors and ages well. On a uPVC door, a cheaper plate is usually the sensible choice. -
How do I size a mail slot plate?
Measure the opening in the door and compare it with the plate’s stated external dimensions and aperture. -
Will a metal plate rust outdoors?
Stainless steel and solid brass resist rust well. Coated and plated steel is more likely to pit over time, especially near the coast. -
Can these covers be painted?
Painted and PVC pieces can usually be overpainted to match a door; bare brass and stainless are best left as finished.
Bottom Line
For a period or solid-wood door, the Deltana MSH158U3 solid brass letter box hood is the top pick: it is the only piece here built to shield the slot and age gracefully at the same time. Buyers on a budget who just need a tidy modern slot should take the rust-resistant matte black plate, and anyone fighting a draught should add the STORMGUARD brush cover on the inside. Check the current price before ordering, since these fittings move quickly.
