How to Replace a Worn Door Sweep Before Winter
If this fix touches water, gas, or power, the guide starts with the shutoff step and says when a licensed pro should take over.
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When cold air sneaks in under a door, people blame the whole door. Most of the time the draft is simpler than that: the bottom seal is torn, flattened, or missing. Replacing the sweep is one of the cheapest fixes on the whole site, and you can feel the difference the same night.
Quick Answer
To replace a worn door sweep, unscrew the old bottom seal from the inside face of the door, cut a new door sweep to width, and mount it so the rubber just touches the threshold with the door closed. A good screw-on sweep costs $8–$15 and takes about 20 minutes to install. If air also leaks around the latch side or top, pair it with fresh weatherstripping instead of blaming the sweep for every gap.
What You’ll Need
- A screw-on door sweep, $8–$15
- Screwdriver or drill
- Tape measure
- Hacksaw or heavy-duty snips if the sweep needs trimming
Step-by-Step
Confirm the leak is at the bottom
Close the door and feel for moving air along the threshold. If the draft is strongest at your ankles and you can see light at the bottom corners, the sweep is the problem. If the sides leak too, the full fix is in how to fix a drafty door.
The rubber blade should touch the threshold, not bend hard against it.
Remove the old sweep
Open the door and back out the screws holding the old sweep to the inside face. If it was glued on, peel it off and scrape away the leftover adhesive. The bottom edge should feel clean before the new sweep goes up.
Cut the new sweep to width
Measure the door and cut the aluminum track if needed. Most sweeps are intentionally a little long out of the package. Dry-fit it first so the ends do not hit the jamb when the door closes.
Set the height with the door closed
Hold the sweep against the inside face and close the door before tightening the screws fully. Adjust it until the blade just kisses the threshold across the whole width. If it folds hard or drags, lower pressure by moving it up slightly.
Time and Cost
| Fix | Time | Cost |
|---|---|---|
| Replace bottom sweep only | 20 min | $8–$15 |
| Sweep plus new weatherstripping | 45–60 min | $15–$25 |
| Handyman visit | — | $90–$180 |
Why This Works
A door needs a small gap so it can swing without scraping. The sweep is the flexible piece that closes that gap once the door is shut. When the rubber tears or hardens, outside air starts moving under the slab, and moving air is what makes the room feel cold even when the thermostat number looks fine.
Mistakes to Avoid
- Setting the sweep too low. Dragging seals wear out fast and make the door annoying to use.
- Skipping the dry fit. Ends that are too long bang into the frame and keep the door from latching cleanly.
- Buying an adhesive-only sweep for a busy exterior door. It works for a while, then peels.
- Ignoring hinge sag. If one bottom corner still leaks, the door may be hanging unevenly. Tighten the screws or pair this with fixing a squeaky door hinge while you already have the screwdriver out.
If the door still leaks after the new sweep, the missing piece is usually perimeter sealing, not another sweep.
FAQ
How do I know if the door sweep is the problem?
Look for daylight at the bottom corners or feel for moving air at floor level with the door shut. If the sides and top feel sealed but the draft is strongest under the door, the sweep is the first thing to replace.
Should the door sweep touch the floor?
It should just touch the threshold, not drag across it. A sweep that presses too hard tears faster, makes the door harder to close, and can scrape finished floors.
Can I use a stick-on sweep instead of a screw-on one?
You can, but stick-on sweeps are usually a temporary fix. A screw-on aluminum sweep lasts longer, adjusts more easily, and holds up better on a main entry door.
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Fix a Drafty Door in an Hour (Weatherstripping That Lasts)
That draft under the front door costs real heating and AC money. Find the gaps with a flashlight, then seal them with $15 of weatherstripping and a sweep.
Time45–60 min Cost$10–$25 easy
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