Direct answer: Most drafts around a door come from worn weatherstripping, a flattened door sweep, or a door that is not pulling tight against the frame when it latches.
Most likely: Start by finding exactly where the air is coming through. A draft at the bottom usually points to the door sweep or threshold gap. A draft along the latch side or top usually points to compressed weatherstripping or a door that is slightly sagging out of alignment.
Use your hand, a thin strip of paper, and a close look at the seal contact to separate a simple seal problem from a hinge or latch alignment problem. Reality check: a small draft is usually a sealing issue, not a failed door. Common wrong move: stacking thicker weatherstripping onto an out-of-square door until it gets hard to close.
Don’t start with: Do not start by caulking the frame shut or buying a whole new door. If the door is misaligned, new seals alone usually will not fix it.
Cold air brushes your feet, light may show under the door, or the gap changes across the width.
Start here: Start with the door sweep and the gap to the threshold. If the sweep is torn, stiff, or not touching evenly, that is the first repair path.
You feel air near the handle or deadbolt side, especially when wind hits that wall.
Start here: Check whether the weatherstripping is flattened or whether the latch is not pulling the door snug against the stop.
One upper corner feels cold while the rest of the door seems mostly sealed.
Start here: Look for door sag, loose hinge screws, or an uneven reveal around the slab before replacing seals.
The whole opening feels cold, the door may rattle slightly, or the seal barely touches anywhere.
Start here: Check for old compressed weatherstripping first, then confirm the door is actually closing square into the frame.
This is the most common cause when the draft is along the sides or top and the door still closes normally.
Quick check: Close the door on a strip of paper at several spots. If the paper slides out easily where the draft is strongest, the seal is not compressing there.
This fits when the draft is mainly at the bottom, especially on older exterior doors or doors that get direct sun.
Quick check: Look from inside with daylight outside, or use a flashlight from the other side. A visible gap under the slab usually means the sweep is not doing its job.
A draft at one top corner or a wider gap at the top latch side usually means the slab has dropped slightly on the hinges.
Quick check: Stand back and look at the reveal around the door. If the top gap is uneven or hinge screws are loose, alignment is part of the problem.
If the door closes but feels loose, rattles in wind, or seals only when you push on it, the latch-side fit is off.
Quick check: With the door latched, press gently on the latch side. If the draft improves when you push, the door is not seating tightly enough against the weatherstripping.
You do not want to treat a bottom-gap problem like a hinge problem, or an alignment problem like a weatherstripping problem.
Next move: You now know whether the main issue is bottom sealing, side/top weatherstripping, or door alignment. If you cannot isolate one area because air seems to come from the trim or wall cavity, the problem may be around the frame rather than the moving door parts.
What to conclude: Most homeowners can fix a clear seal or minor alignment issue. A draft coming from behind interior casing is a different repair and not a door-parts problem.
Bottom drafts are usually the simplest and most obvious repair path, and they do not require guessing at hinges or latches first.
Next move: The cold air at the floor should drop noticeably, and you should no longer see or feel a gap under the slab. If a new or adjusted sweep still leaves one side open, the door slab is likely out of alignment or the threshold relationship is off.
What to conclude: A failed sweep is a direct part replacement. An uneven bottom gap usually means the door is hanging slightly off and needs alignment attention too.
When the draft is at the latch side, hinge side, or top, worn weatherstripping is more common than a major door failure.
Next move: The door should close with light, even resistance and the draft along the frame should be reduced or gone. If new weatherstripping still does not contact in one area, the door is not meeting the frame squarely and needs alignment correction.
A door that has dropped even a little can open a top-corner gap and keep the latch side from compressing the seal evenly.
Next move: The top corner draft should improve, the latch side should pull in more evenly, and the door may feel more solid when shut. If tightening does not change the reveal or the screws will not hold, the jamb or hinge mounting may need repair that goes beyond a quick DIY adjustment.
By this point you should know whether the draft is coming from a replaceable door seal part or from a bigger fit problem around the opening.
A good result: You end up with a door that closes normally, seals evenly, and no longer leaks cold air at the problem spot.
If not: If the door still drafts after confirmed seal replacement and basic hinge tightening, the opening likely needs frame correction or a carpenter's fit-up rather than more parts swapping.
What to conclude: Most draft complaints are solved with the right seal part. When they are not, the real problem is usually the way the door sits in the frame, not the door slab itself.
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If the seal looks decent but the draft is strongest at one corner or along the latch side, the door may not be closing square into the frame. A slight sag or loose top hinge can keep good weatherstripping from touching where it needs to.
Replace the part where the air is actually getting through. Bottom draft means start with the exterior door sweep. Side or top draft means start with the exterior door weatherstripping. Do not buy both unless your checks support both.
Usually not the best first move. If the door is already slightly out of alignment, thicker seal can make the door hard to close and still leave gaps in the wrong places. Match the original seal style and fix alignment first if needed.
Wind pressure exaggerates small gaps. A door that feels mostly fine on a calm day can leak badly when wind pushes against the latch side or top corner. That usually points to weak seal contact, not necessarily a bad door.
If air is coming from behind the interior trim, the jamb feels loose, or you find rot or movement in the frame, the issue is beyond the normal door sealing parts. At that point, treat it as a frame and air-sealing repair instead of a sweep or weatherstripping swap.