Most foundation cracks are not an emergency. Houses settle a small amount as soil compacts, and that normal movement often shows up as thin, straight cracks in concrete or drywall. A structural warning sign looks different: it’s wide, growing, diagonal, or paired with doors and windows that stick or won’t latch. If you’re seeing the second pattern, the safest next step is a professional assessment, not a DIY fix.
Stop and Call a Professional First If You See This
Some signs point to a safety risk, not just a repair decision. Do not wait on these:
- A crack wider than a pencil (roughly 1/4 inch or more) that has grown in the last few weeks or months
- A wall that is visibly bowing, leaning, or bulging inward
- A stair-step crack pattern in brick or block that spans multiple courses
- Doors or windows that suddenly stick, won’t latch, or have gaps that weren’t there before
- A floor that has become noticeably uneven, sloped, or springy
- Water actively pooling against the foundation or seeping through a new crack
- Any sign the house has shifted after flooding, a nearby excavation, or a suspected sinkhole
These situations call for a licensed structural engineer or foundation specialist, not a general handyman fix. Never attempt to shore up, jack, or patch a structural crack yourself — misjudging the cause can make the movement worse. For a full list of the project types that call for licensed help on this site, see the Home Project Safety Disclaimer.
Normal Settling Cracks: What They Look Like
Cracks that are usually cosmetic tend to share these traits:
- Thin, hairline width, staying about the same size over time
- Vertical or running in a fairly straight line
- Found near the top of a foundation wall or around window and door corners in drywall
- Not paired with doors sticking, sloped floors, or new water entry
Even a “normal” crack is worth writing down and photographing with a ruler or coin next to it for scale. If it grows over the next few months, that change in size — not the crack itself — is often the real warning sign.
A Simple Decision Path
- Look at the crack or symptom. Is it wide, growing, diagonal, or accompanied by sticking doors, sloped floors, or new water entry? If yes, skip to step 4.
- If it looks like a thin, stable, cosmetic crack, measure it and take a dated photo.
- Recheck it in 2 to 3 months. If it hasn’t grown and nothing else has changed, continue routine monitoring.
- If it has grown, or if any of the stop-first signs above show up at any point, contact a licensed structural engineer or a foundation repair company for an on-site assessment.
What a Professional Structural Assessment Usually Covers
An assessment is a diagnostic visit, not a repair. A structural engineer or qualified inspector generally reviews the exterior grading and drainage around the home, the visible foundation walls, interior cracks and floor level, and door and window operation, and may check crawl space or basement conditions where accessible. They should give you a written report explaining what they found and whether repair is needed — not just a repair quote. Asking for the written findings separately from any repair estimate helps you get a second opinion if you want one.
Cost and What You Can Verify
Assessment and repair costs depend on your region, the foundation type, and the scope of the problem, so this article does not list prices. Get a written, itemized quote from more than one licensed provider, and ask each one to explain what evidence supports their diagnosis, not just their recommended fix. If a company recommends repair without ever putting a written explanation in front of you, that’s worth questioning.
Permits, Licensing, and Your Local Building Department
Foundation repair often requires a permit and a licensed contractor, but the specific rules depend on where you live. Before hiring anyone, contact your local building or permitting department to confirm what’s required in your area, and ask any contractor for their license number so you can verify it with your state licensing board. USA.gov’s directory of government agencies and departments can help you find the right state or local office if you’re not sure who to contact.
Where Foundation Issues Fit Into Overall Home Health
Foundation problems don’t just affect the structure. HUD’s Office of Lead Hazard Control and Healthy Homes works to address housing-related hazards such as mold and moisture, and a foundation crack that lets in water can end up feeding one of those hazards elsewhere in the home. That’s one more reason to have water intrusion near a foundation crack looked at rather than just patched over.
Frequently Asked Questions
Is it normal for a house to have some foundation cracks?
Yes. Almost every foundation develops some hairline cracking as concrete cures and soil settles. The concern is size, growth, and whether other symptoms — like sticking doors or sloped floors — show up alongside it.
What size crack means I should worry?
There’s no single number that applies to every home, but a crack wider than about 1/4 inch, one that’s actively growing, or one running diagonally is a common trigger for getting a professional opinion rather than waiting.
Who do I call: a structural engineer, a foundation company, or a home inspector?
A structural engineer gives an independent diagnosis and isn’t selling you a repair. A foundation repair company can also assess the issue but may be motivated to recommend their own repair method, so a second opinion is reasonable for anything beyond minor cracking. A general home inspector can flag a concern but typically isn’t qualified to make the final structural call.
How much does a foundation assessment cost?
It varies by region and by whether you’re hiring an independent structural engineer or getting a free inspection from a repair company. Ask for a written quote up front and confirm whether the visit includes a written report.
How We Verify This Information
This article is based on general guidance from federal housing-safety sources and is checked against our own editorial process. You can read more about how we source and fact-check our guides on our Sources and Methodology page, and see our full approach on the Editorial Standards page.
Safety Disclaimer
This article is for general education only and is not a substitute for an on-site inspection by a licensed structural engineer or qualified contractor. Foundation problems can affect the safety of your home. Permit and licensing requirements vary by location — confirm current rules with your local building department before starting any repair. If you observe active structural instability, a collapsing wall, or any immediate safety hazard, leave the area and contact a qualified professional right away.