Best Door Draught Excluders UK 2026: Under-Door & Frame Seals

The Short Answer

For external doors, get a Stormguard seal kit (rubber seals for the frame + brush strip for the bottom). For internal doors where you just want to stop cold air creeping under, a brush strip is the permanent fix or a weighted door sausage if you don't want to drill anything. Budget £6–£18 per door. The whole house can be done in an hour.

Why Doors Matter More Than You Think

Run your hand around the edge of your front door on a cold day. Feel that? That cold air is flowing into your house continuously, 24 hours a day, all winter. The gap under a typical external door lets through as much cold air as having a 6-inch hole in your wall. The gaps around the frame add to it.

Most people notice draughty windows but ignore doors — probably because you can't see the gap as easily. But doors, especially front doors with letterboxes, are often the biggest single source of draughts in a UK home.

External Doors vs Internal Doors

The approach is different depending on which door you're sealing:

External doors (front door, back door, side door to garage) need a full seal: rubber compression strips around the frame and a brush or seal at the bottom. These are the doors where cold outside air is getting in.

Internal doors are about stopping cold air moving between rooms — typically from an unheated hallway into a warm living room. A simple brush strip under the door is usually enough. You don't need to seal the frame.

Our Picks

Best for External Doors: Stormguard Door Seal Kit

We've covered this in our main draught-proofing guide, and it's still the best all-in-one solution. The kit includes self-adhesive rubber seals for the top and sides of the frame, plus a brush strip for the bottom of the door. Clean the frame, peel and stick the rubber seals, screw the brush strip onto the inside face of the door. Fifteen minutes per door.

Two kits (front and back door) costs £20–£36 and saves an estimated £20–£40 per year in reduced heat loss. That's a payback of under a year — and your hallway will feel noticeably warmer immediately.

Best Under-Door Seal (Permanent): Brush Strip

A Diall brush strip screws to the bottom of the door and creates a seal with flexible bristles. It's the best permanent solution for under-door draughts because the bristles flex over uneven floors and carpet without dragging. Standard 838mm strips fit most UK doors — measure yours before ordering.

Installation needs a drill and screwdriver, and you'll want to take the door off its hinges if possible (makes it much easier to screw the strip on straight). If you can't be bothered to take the door off, you can do it in situ — it just takes a bit more patience.

At £6–£10, this is one of the cheapest and most effective energy upgrades you can make to a door.

Best Under-Door Seal (No Installation): Weighted Draught Excluder

If you're renting, don't want to drill, or just need something quick, a weighted fabric draught excluder (the classic "door sausage") does a decent job. Modern versions are weighted with sand or rice so they stay put against the door, and they're long enough for standard UK door widths.

They're not as effective as a fixed brush strip — they don't seal as tightly, and they move when you open the door (you have to kick them back into place). But at £8–£15 with zero installation, they're the path of least resistance. Better than nothing by a long way.

What About Letterboxes?

If your front door has a letterbox, that's a separate draught source — and often a bigger one than the gap under the door. An Exitex letterbox excluder (£8–£14) fits an internal brush cover over the slot. See our draught-proofing guide for more on this.

Cost and Savings Summary

Door Type	Product	Cost	Annual Saving
Front door (full seal)	Stormguard kit	£10–£18	£10–£20
Back door (full seal)	Stormguard kit	£10–£18	£10–£20
Internal door (permanent)	Brush strip	£6–£10	£5–£10
Internal door (no drill)	Weighted excluder	£8–£15	£3–£8

For the complete draught-proofing picture — chimneys, letterboxes, pipes, and more — see our full draught-proofing guide.