ServiCover📌 Key Takeaway: Sticking doors, sloping floors and stair-step or horizontal cracks are the classic red flags. Hairline vertical cracks are often just concrete shrinkage.
Inside the Home
- Doors and windows that stick or no longer latch
- Cracks in drywall running diagonally from door and window corners
- Floors that slope, bounce or feel uneven
- Gaps between walls and ceilings or floors
Outside the Home
- Stair-step cracks in brick or block
- Horizontal cracks in basement walls
- Chimney leaning away from the house
- Gaps around window frames or exterior doors
- Soil pulling away from the foundation
Normal vs. Worth Checking
| Sign | Likely Meaning |
|---|---|
| Thin vertical crack, not growing | Often normal concrete shrinkage |
| Crack wider than about 1/4 inch | Get it assessed |
| Horizontal basement wall crack | Soil pressure — call a specialist |
| Stair-step crack in block wall | Possible settlement — call a specialist |
| Crack that keeps widening | Active movement — act soon |
Simple Monitoring Tip
Mark the ends of a crack with a pencil and note the date. Measure it again every few months. A crack that grows is a sign of active movement worth reporting to a professional.
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Get Free Quotes →Frequently Asked Questions
Is a sticking door always a foundation issue?
No — humidity also swells doors. It matters more when it appears alongside cracks or sloping floors.
Should I buy a house with foundation issues?
Get a structural engineer's report and repair quotes first, and use them in price negotiations.
🔎 How we research: The ServiCover Editorial Team compiles prices and guidance from published 2026 cost guides, manufacturer information and industry sources. Prices are national ranges and vary by location, home and provider, so always compare written quotes. We don't perform the work ourselves, and we may earn a commission when you request quotes through our partners — see our Advertiser Disclosure.