Draught stoppers are one of the cheapest ways to make a cold room more comfortable. But do they actually work, or are they just a cosy-looking accessory? Here is the honest answer, along with how to tell a good one from a useless one.
The short version: yes, draught stoppers work, for the gap they cover. They block cold air sliding under a door and warm air escaping, so a room feels warmer almost straight away. The catch is fit and quality. A heavy, well-made stopper seals the gap and stays put. A light, flimsy one drifts off and does little.
Do draught stoppers actually work?
Yes. A draught stopper blocks air moving through the gap under a door. On a draughty door that gap is a steady leak of warm air, so closing it makes the room warmer and steadier within minutes. The honest limit: if a door is already well sealed, a stopper adds little. Most internal doors are not well sealed.
Draughts are a real source of heat loss, not a trivial one. Older or draughty homes can lose roughly 15 to 20 percent of their heat through gaps and draughts. A 3mm gap under a door doesn't look like much, but across the full width of a doorway it adds up to roughly the same opening as a small hole cut through the wall. Closing the easy gaps is worth it.
How much heat does a draught stopper actually save?
On its own, one draught stopper won't transform your heating bill. What it does is remove one of the most common draughts in a room, which is why draught-proofing as a whole is rated so highly. The UK's Energy Saving Trust, for example, estimates that draught-proofing a home saves around £85 a year. A stopper is the cheapest first step toward that, and the easiest to fit, since there is nothing to fit at all.
Draught stopper vs door sweep vs weatherstripping
All three close gaps, in different ways. A draught stopper sits against the floor and needs no installation. A door sweep is fixed to the bottom of the door for a permanent seal. Weatherstripping seals the sides and top of the frame. Many homes use a mix.
| Fix | Where it works | Installation | Best for |
|---|---|---|---|
| Draught stopper | The gap under the door | None, just place it | Renters, flexibility, moving between doors |
| Door sweep | The gap under the door | Screwed or stuck to the door | A permanent fix on one door |
| Weatherstripping or foam tape | The sides and top of the frame | Stuck around the frame | Draughts around the edges, not the floor |
A draught stopper is the no-commitment option. Nothing to screw on, nothing to damage, and you can move it between doors. For a door you never want to touch again, a sweep is a good permanent choice. The two work well together.
What makes a good draught stopper?
Two things: weight, and a fill that holds its shape. Weight keeps it pressed to the floor so it doesn't get nudged out of place. A dense fill stops it flattening and leaving the gap open. Material decides how long it keeps doing both, and whether it looks like something you want on show.
- Weight. Heavy enough to stay against the gap when the door moves.
- A dense fill. Flaxseed or wool, not loose polyester that packs down.
- The right length. Matched to your door width for a clean seal.
- A natural material. Wool breathes, lasts, and doesn't smell of plastic.
- Looks. It sits in plain view, so it may as well suit the room.
What is the best filling for a draught stopper?
A dense, heavy, natural fill works best. Flaxseed and felted wool are weighty, hold their shape, and breathe, so they seal well and don't sag. Light polyester is cheaper but flattens over time and lets the draught back in.
Wool vs synthetic draught stoppers
Wool holds its shape, breathes, and doesn't carry a chemical smell. Synthetic stoppers are usually cheaper, but the lighter ones flatten, and some hold damp or have a faint plastic odour. For something that sits in your room all winter and lasts several, wool earns its place.
Our felted wool draught stopper is weighted with flaxseed, with a little dried lavender through the fill, and made by hand in fourteen colours. It is heavy enough to stay put and built to last more than one winter.
How to use a draught stopper
- Measure the width of your door at the base, and choose a stopper the same length or a touch longer.
- Set it on the warm side of the door, against the gap.
- Use the loop to lift it and hang it away when the season turns.
- Try it against a single-glazed window sill, where cold air pools.
- Keep it dry. Spot clean with a damp cloth, and don't soak it.
Frequently asked questions
Do cheap draught stoppers work?
Sometimes, but the light ones do little. What matters is weight and a dense fill, not the price tag. A flimsy stopper drifts away from the gap and flattens, so it stops sealing. A heavier one stays put and keeps working.
How do I stop a draught under my door without buying anything?
A rolled-up towel works for an hour, then shifts out of place. It is fine as a quick test. For a fix that lasts, a fitted door sweep or a weighted draught stopper stays against the gap and holds its shape.
Do draught stoppers work on the front door?
Yes. They work on exterior doors too. Choose a heavier stopper for wider gaps, and pair it with weatherstripping around the frame if cold air comes in at the sides as well as the floor.
Can I get a draught stopper to fit an odd-sized door?
Measure the base of your door first. Most doors take a standard length, but if yours is unusual, ask about a custom length before you order.
Do draught stoppers help with noise or dust?
Yes. Sealing the gap under a door also cuts some sound, dust, and insects coming through, along with the draught.
Do draught stoppers work in summer?
Yes. The same seal that keeps warm air in during winter slows warm air entering a cooled room in summer. Many people leave them in place year-round.
The easiest draught to fix
A draught stopper is a small fix that pays off the same evening. Pick one heavy enough to stay put and made to last. Shop our felted wool draught stopper in fourteen colours, and seal the easiest draught in the house. For the full rundown on sealing the gap, see how to stop draughts under doors.
