Foundation problems rarely announce themselves. They show up as small annoyances — a door that sticks, a hairline crack — that are easy to live with until they aren't. Catching them early is the difference between a few thousand dollars and a five-figure repair.
Signs inside the house
- Sticking doors and windows that used to open fine — the frame is racking as the structure moves.
- Cracks above door and window corners, where stress concentrates.
- Sloping or uneven floors — drop a marble and watch where it rolls.
- Gaps between walls and the ceiling, or between cabinets and the wall.
- Stair-step cracks in basement block walls.
Signs outside
- Visible cracks in the foundation wall, especially horizontal ones.
- A foundation wall that bows or leans inward.
- Gaps around the garage door or where the chimney meets the house.
- Water pooling against the foundation after rain — a cause, not just a symptom.
Thin vertical cracks and minor settling in the first couple of years are usually cosmetic. Horizontal cracks, anything wider than ¼ inch, and signs that appear together across the house point to active movement.
When to act now
If you see a wall actively bowing, cracks that are visibly widening week to week, or several of the signs above at once, don't wait — get a licensed structural engineer to inspect before damage compounds. Then price the fix with the repair cost calculator and check whether the cause might be covered by insurance.
Symptom guidance reflects standard structural-inspection practice. Cost ranges follow national aggregators — see our methodology.