How to stop drafts under doors cheaply: 7 fixes
Key takeaways
- Most under-door fixes cost $10 to $30 and take under an hour per door.
- Start with the gap under the door: it is usually the biggest single leak.
- Fix a sagging or misaligned door first, or new seals will wear out fast.
Cold air under the door is one of the most annoying drafts in a house, and one of the cheapest to fix. Exterior doors need small clearance gaps to open and close, and the gap at the bottom is often the largest leakage point because thresholds and floors are rarely perfectly even, according to HomeTips founder Don Vandervort. The good news: most fixes land in the $10 to $30 range per opening and take 30 to 90 minutes per exterior door, per HomeRoomFix.
This article explains how to stop drafts under doors cheaply: how to find the leaks, the cheapest fixes that actually work, how to install a door sweep, and when spending a little more pays off.
Find the leak first
Do not buy anything until you know where the air comes in. Close the door on a cold or windy day and slowly move your hand around the edges, especially the bottom. A lit candle or a strip of tissue paper works too: the flame or paper flutters where air moves. Seasoned Handyman recommends this test-first approach so you fix the real leak instead of guessing.
Also check whether the door itself is the problem. Vandervort warns that weatherstripping only works when the door sits aligned in its frame. If the door sags, rubs, or closes unevenly, fix the alignment first, or the new seals will wear out quickly and fail to seal. Tightening hinge screws is free and often enough.
Doors that swell and stick in summer can signal related fit issues. See why doors stick in summer.
1. The rolled towel (free)
The oldest fix still works. Roll a bath towel tightly and press it against the bottom of the door on the inside. It blocks the gap well enough for a night or a weekend. It is ugly and you have to move it every time the door opens, but the price is zero. It also tells you immediately how much difference sealing that gap makes.
2. A draft stopper or draft snake ($7 to $10)
A draft stopper is the towel idea, productized: a fabric tube, often filled with foam or sand, that sits against the door bottom. Dengarden highlights the Easy Home Double Draft Excluder at Aldi for $6.99, on sale starting October 14 in black or gray. The double style slides under the door so it blocks both sides and moves with the door as it opens and closes. No tools needed, and you can remove it in spring.
3. Adhesive door sweep ($8 to $15)
A door sweep is a strip with a brush or rubber fin that attaches to the bottom of the door and brushes the threshold as the door moves. Adhesive-backed versions stick to the inside face of the door in minutes. Better Homes & Gardens lists installing a door sweep among its core draft fixes because it closes the gap while letting the door swing normally.
4. Screw-on door sweep ($10 to $20)
The sturdier cousin. You trim it to the door's width, screw it to the bottom inside face, and adjust it so the fin just touches the threshold. Seasoned Handyman's rule: enough to seal, not so much that it drags hard and makes the door tough to open. Test the swing and adjust. This is the fix to choose for a front or back door you use every day.
5. Foam weatherstripping on the jamb ($5 to $12)
If air also sneaks around the sides and top, self-adhesive foam tape on the door stop does the job. Clean the surface first: Seasoned Handyman stresses that weatherstripping will not bond to dust or old adhesive, so wipe the jamb down and let it dry. Press the foam along the stop so the closed door compresses it slightly. Snug, not crushed: too thick and the door will not latch.
6. V-strip for the sides (a few dollars)
V-shaped tension strips, usually metal or plastic, spring open to fill the gap along the door's sides. They last longer than foam and work well where the door meets the frame. They cost little and install with small nails or adhesive, depending on the type.
7. Caulk the frame-to-wall gap ($5 to $8 a tube)
The leak most people never check is the stationary gap between the door frame and the wall. Seasoned Handyman notes these get caulk, not weatherstripping, because they never move. Run a bead of exterior-rated caulk along the joint where the frame meets the siding or wall and smooth it in. For help choosing the right tube, see caulk vs sealant and how to stop drafts around windows and doors for the humidity angle.
When to spend a little more
Cheap fixes cover most doors, but two situations justify spending more. First, a worn-out threshold: if the metal or wood strip under the door is cracked, rotted, or missing, a new threshold ($15 to $40) plus a door shoe gives a far better seal than any sweep alone. Second, a door that is warped beyond adjustment. No weatherstripping seals a banana-shaped door. At that point the honest fix is planing, rehanging, or replacing it.
For perspective on the payoff, home-economics creator Brenda Carver notes that sealing thumb-sized gaps around the house can take 10 to 20 percent off a heating bill, with almost every fix sitting on the bottom shelf for a few dollars. Start with the worst door, measure the result, then decide whether the rest of the house is worth the afternoon.
The bottom line
Stop under-door drafts cheapest-first: a towel tonight, a $7 draft stopper this week, and a $10 to $20 door sweep for a permanent fix. Add foam weatherstripping on the sides and caulk where the frame meets the wall, and most doors are sealed for under $30 in parts. Align the door before you seal it, and the fix will last.
What is the cheapest way to block a draft under a door?
A rolled towel is free. The cheapest real product is a fabric draft stopper, around $7, like the double-sided excluders sold seasonally at discount retailers.
Do door sweeps work on uneven floors?
Mostly yes. Brush-style sweeps conform to small unevenness better than rigid rubber fins. For big dips, a door shoe or a new threshold seals better.
Should I caulk under a door?
No. Caulk is for stationary gaps, like where the frame meets the wall. The gap under a moving door needs a sweep, a shoe, or a draft stopper, never caulk.
How long does weatherstripping last?
Foam tape lasts a year or two of daily use. Rubber, silicone, and V-strip last several years. Sun, slamming, and misalignment shorten every type's life.
Topics: drafts, weatherstripping, door sweep, winterizing, energy savings
Rive News is the research desk behind this article. It covers practical home and DIY explainers.
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