Warning signs

Doors and windows that stick

This is usually the first thing a house does that makes someone start searching. It is also the sign most readily explained away as weather — which is sometimes right, and sometimes how a foundation problem goes unnoticed for another two years.

General information, not an assessment

A sticking door is a symptom with several possible causes, most of them minor. Nothing here can tell you which applies to your house.

Why a door is a good instrument

A door frame is a rectangle installed plumb and square inside a wall, with a consistent gap around a rigid slab of material. That makes it an unusually sensitive gauge: distortion of a fraction of an inch across the opening shows up as a door that catches, long before anyone would notice the wall itself is out of true.

When part of a house settles, the walls above it rack — the rectangles become very slightly parallelogram. The door, still rectangular, no longer fits. That is the whole mechanism, and it is why doors frequently report movement before cracks do.

Humidity or movement? Four things to check

  1. Where does it bind? Humidity swells the door across its width, so it binds along the latch edge, fairly evenly. Racking binds it at one corner — usually the upper corner on one side.
  2. Is the gap even? Close the door and look at the reveal all the way round. A consistent gap that has narrowed everywhere suggests swelling. A gap that tapers — tight at the top, wide at the bottom, or the reverse — is geometry.
  3. Does it come back? Moisture problems are seasonal and reversible. If the door was fine in February, stuck in August, and was fine again the following February, that is wood behaving normally. If it stuck last August and never recovered, and stuck worse this August, that is a different story.
  4. Is it alone? One door is one door. Three doors along the same wall line, or a door plus a window plus a crack at that corner, is a pattern.

Other causes worth ruling out

Plenty of sticking doors have nothing to do with the ground, and it is worth checking the cheap explanations first:

  • Loose or worn hinges. Screws back out over decades. A door that has dropped on its hinges drags at the bottom of the latch side. Tightening or replacing with longer screws that reach the stud fixes it in minutes.
  • Paint build-up. Several coats on the edge of a door and inside the jamb genuinely closes the tolerance.
  • New flooring. Carpet or tile added on top of the old surface raises the floor under the swing.
  • A swollen or shifted strike plate, or a latch that has simply worn out of alignment.
  • Seasonal framing movement in a house with a large roof load or an attic that gets very hot — real, and not a foundation issue.

If tightening the hinges fixes it, you are done. If the frame itself is visibly out of square, it is worth looking further.

How to check whether the frame is square

Two minutes with nothing more than a tape measure:

Measure the two diagonals of the door opening, corner to corner. In a square opening they are equal. A meaningful difference between them means the opening has racked — and the direction tells you which corner has dropped. Do the same on another door on the opposite side of the house for comparison; if one is out and one is fine, that difference is the useful finding.

Note the numbers and the date. Repeating the measurement in six months is the cheapest progress monitor available to you, and it answers the question that actually matters — is it still moving?

What tends to come next

Where sticking doors are the leading edge of foundation movement, the symptoms that usually follow are diagonal cracks radiating from the corners of the same openings, then stair-step cracking in exterior brick on that elevation, then gaps opening where trim meets wall. More on reading those cracks →

None of that is inevitable. Many houses stick a door, sit there for a decade, and do nothing else. The point of noticing early is that you get to watch rather than react.

Questions about sticking doors and windows

Is a sticking door a foundation problem or just humidity?

Humidity swells wood across the grain, so a humidity-related door binds along its whole edge, usually on the latch side, and it eases again when the weather changes. Foundation movement racks the frame out of square, so it binds at one corner — typically the top corner on one side — and it does not ease. The two tests worth running: does it happen in the same season every year and then stop, and is the gap around the closed door even? A tapering gap is a geometry problem, not a moisture one.

Why do doors stick on only one side of the house?

Because foundation movement is almost always differential — one part of the house moves relative to another rather than the whole thing moving evenly. The side that has dropped is where the frames rack first, so the doors along that elevation bind while doors elsewhere stay fine. That clustering is genuinely diagnostic: several doors misbehaving along one wall line is a much stronger signal than the same number scattered randomly through the house.

Can I just plane the door to fix it?

You can, and plenty of people do. The thing to understand is that planing adapts the door to the current geometry. If the movement continues, you will plane again; if the house is lifted during a later repair, the door will now be too small and swing loose. Planing is a reasonable comfort measure once you know the movement has stopped. Doing it before you know is throwing away one of your better progress indicators — how much worse it got, and how quickly.

What about windows that will not open?

Same mechanism, and often a better indicator than doors because windows are used less and therefore less often adjusted. A double-hung sash that has become hard to raise, a casement that no longer meets its seal evenly, or a window that has cracked its glass without impact are all worth noting. Cracked glass in particular is a strong signal: it takes meaningful frame distortion to break a pane, and it is rarely caused by anything else in an ordinary house.

The door sticks but there are no cracks. Is that odd?

Not at all, and it is a common sequence. Door frames are among the most sensitive parts of a house to racking because they are a large rectangular hole in a wall, so they frequently report movement before the finishes do. Cracks tend to follow later as stress accumulates at the corners of those same openings. A sticking door with no visible cracking is worth photographing and re-checking rather than dismissing — it may simply be early.

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