A door that will not close is the symptom that finally makes people call someone. It is also the symptom most likely to mean nothing at all.
The humidity explanation, which is usually the right one
Wood takes on moisture from the air and swells. Kansas City summers are humid, so a wooden door that closed fine in February can bind in July and be fine again by October.
Humidity swelling has a signature: the door sticks along an edge, the gap around it stays roughly even, and it comes and goes with the season. If the door binds every August and frees up every autumn, that is what you are looking at, and it is a plane or a dehumidifier, not a foundation.
The structural explanation, and how it looks different
When part of a house moves, the door frame stops being a rectangle and becomes very slightly a parallelogram. The door itself stays rectangular. So the gap between them is no longer even — it tapers.
That is the test. Close the door as far as it will go and look at the gap all the way round:
- Even gap, door binds on one edge, seasonal. Humidity. Very common.
- Wedge-shaped gap, wider at one corner than the other, and it does not come back in winter. The opening has gone out of square.
- The latch no longer lines up with the strike plate — the door has dropped or lifted relative to the frame.
- A gap opening between the top of the doorframe trim and the ceiling, or a crack running diagonally from the corner of the frame.
Check whether it is more than one thing
A single sticking door is weak evidence on its own. What makes it meaningful is a pattern:
- Two or more doors on the same side of the house.
- Windows on that side getting stiff too.
- Diagonal cracks at the corners of door or window openings.
- Gaps opening where trim meets wall or ceiling.
- A floor that has developed a slope you can feel.
One door is a door. One side of the house is a foundation.
Then go and look in the basement
This is the step that separates Kansas City from a slab market. Here, the thing that moved the door is usually visible downstairs, because you can actually see your foundation.
Go to the part of the basement underneath the doors that are sticking, and look at the wall on that side. Is it still flat? Is there a horizontal crack along a mortar joint? Is there efflorescence or a damp line? Is a support post sitting on a cracked pad?
Very often the upstairs symptom and the basement evidence are on the same side of the house, and that connection is most of the diagnosis.
What we would check
Elevations across the whole floor, so there is a number rather than an impression, and then the basement walls on the side that is moving. The two together say whether the house has settled, whether a wall is coming in, or whether you have a humid summer and a door that needs three passes with a plane.
That last answer is a genuinely common outcome, and when it is the answer we will say so. The evaluation is free either way and you get the numbers in writing.
