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12 inch Narrow Letterbox

Price From: £16.61 Exc Vat £19.93 Inc Vat

In stock

Weatherproof and Non-Rattle as standard!

  • Suitable for upvc, composite or aluminium doors with narrow frames.
  • 12 inch narrow letterbox - 317mm x 50mm actual sizes. Watch the installation video.
  • All metal surround and letterplate construction made from aluminium.
  • How to replace your upvc letterbox and FAQ's.
  • Fitted with non-corrosive springs with inherent strong closure to avoid rattling letterboxes.
  • Detachable telescopic sleeves (40-80mm door thickness) mean you can just attach the front and back plates or clip the sleeves into place for a fully enclosed postal slot. Read more about telescopic sleeves below.
  • Foam seal/pad fixed to flap to stop draughts and improve the weatherability of your letterbox.
  • Self tapper screws provided for upvc for an easy fix (screw straight into your door).
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Narrow Letterbox 12" Sizes


Hole through the narrow letterbox sizes shown in diagram below - open the inside letterbox flap and measure across the postal slot.


Postal slot on your existing letterbox can be between 280mm x 40mm max).

12Inch Narrow uPVC Letterbox

12" Narrow Letterbox O/A Sizes: 317mm x 50mm Fixing centres @ 292mm


A robust UK manufactured slimline narrow letterbox for use with PVC and aluminium double glazed doors. An all metal construction surround and plate give this letterbox a real quality feel! The flaps are designed to open to 95 degrees and this narrow letterbox will even take A4 post comfortably!


A lot of the old aluminium double glazed doors used this narrow slimline letterbox as standard so this model provides an ideal replacement. Due to the narrowness of the letterbox the postal slight is somewhat challenged to provide sufficient space for an adequate level of post which is why the brush seal is left out of this design. The weather sealing performance is however not compromised as the outer letterplate flap contains a thick foam pad which provides a seal against window and rain ingess when closed.


One of the big features of this narrow letterbox is the detachable sleeve. The letterbox unit comprises of two halves of the inner sleeve which slide within one another when the letterbox is together but they can be detached if not needed, or even if you want to cut down the length of the sleeve as this will be easier to do. This leaves you free to consider using just the letterplates each side.



To fix this letterplate to the door requires only the use of a self-tapping screw for upvc (supplied) or if a double glazed aluminium door then rivets can be used. The screw holes are positioned centrally at 292mm centres.



It's easy to look after this letterbox by cleaning with a dry cloth. It needs nothing more than that so please avoid any chemical cleaners as they are needed and can degrade the finish.

If you have received your tracking number via email from Hermes you can check the status here.

If you want to find a Hermes parcel shop use this link here.

* UK deliveries over 15kg in weight will be delivered by DPD.

** Does not include weekend or Bank Holiday delivery days.

Delivery Charges Hermes and DPD Hermes Tracking Hermes Parcelshops


The following special offers are available to you when you buy the 12 inch Narrow Letterbox. The discount for the special offer will show in the cart if both the 12 inch Narrow Letterbox and the special offer product are added.

Customer Reviews 1 item(s)

  • Price
    Review by Alice Lynch
    (Posted on 07/04/2015)
    "Helpful and knowledgeable!"
    Letterbox is a perfect fit - lady on the phone helpful and knowledgeable about product. Delivery fast and easy to track. Very happy customer - just wish all online stores were this efficient!

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