Foundation crack repair starts with one question: is the crack a sign the structure is moving? Fixr notes that small, level hairline cracks under 1/8 inch often only need sealing, while structural cracks such as stair-step cracks in basement walls call for bigger repairs, often including underpinning [1]. This page is about the second kind.
Cracks that point to movement
- Stair-step cracks in block or brick. Fixr says these, especially near the corners of the house, can suggest uneven settlement [1].
- Horizontal cracks with an inward bulge. Usually tied to soil pressure on the wall. See bowing wall repair.
- Cracks that keep widening. Mark the ends with a pencil and the date, then check again in a few months.
- Cracks with other signs. Fixr lists sticking doors and windows, drywall cracks at the corners of openings, and sloped floors among interior warning signs [1].
Small vertical cracks usually aren't a major problem, Fixr says [1]. For larger ones it recommends having a structural engineer check [1].
Cracked foundation repair: what the fix usually involves
The crack is the symptom. The repair targets the cause:
- Wall movement: anchors, straps or braces.
- Settling: push piers or helical piers.
- Then the crack itself is sealed or injected. Fixr notes epoxy or polyurethane injection helps where there may be instability but isn't permanent on its own [1].
National prices
| Item | Published range | Source |
|---|---|---|
| Crack sealing or injection | $200 to $1,000 | Fixr, Jan 2026 [1] |
| Minor structural cracks from settling | $1,000 to $5,000 | HomeGuide, Nov 2025 [2] |
| Moderate settling repair | $4,500 to $15,000 | HomeGuide, Nov 2025 [2] |
| Structural engineer's report | $300 to $2,000 | Fixr, Jan 2026 [1] |
Permits
Sealing a crack may not need a permit, but structural repair usually does. West Allis exempts only repairs that don't change a building's structural strength [3]. Cudahy lists foundation repairs among its required building permits [4]. Germantown's residential permit sheet does the same [5].
FAQ
Is a crack in a new house normal?
Some cracking is. Fixr says all foundations crack during settling [1]. Watch for growth, displacement or the signs above.
Who should look at it first, an engineer or a contractor?
Either can. An engineer gives an independent opinion. See foundation inspection.
Do I have to disclose a repaired crack when I sell?
A known crack belongs on the state's seller condition report, where item B7 covers foundation defects [6]. Keep the paperwork.
Get a quote
Request a quote. A photo of the crack with a tape measure helps.
We're a referral service, not a contractor, and independent contractors may pay us for referrals.
Sources
- Fixr, "How Much Does It Cost to Repair a Foundation in 2026?" (Dan Simms), updated Jan 27, 2026. Supports: hairline under 1/8 in often only sealing; stair-step cracks structural, may need underpinning; stair-step near corners suggests uneven settlement; interior signs; small vertical cracks usually not major; larger cracks call a structural engineer; injection not permanent; crack sealing $200 to $1,000; engineer's report $300 to $2,000; all foundations crack during settling. https://www.fixr.com/costs/repair-foundation
- HomeGuide, "How Much Does a Sinking Foundation Repair Cost? (2026)," Nov 21, 2025. Supports: minor structural cracks $1,000 to $5,000; moderate settling $4,500 to $15,000. https://homeguide.com/costs/sinking-foundation-repair-cost
- City of West Allis Code 13.05. Supports: no permit only for repairs that don't change structural strength. https://westallis.municipalcodeonline.com/book/print?name=13.05_Permits&type=ordinances
- City of Cudahy, Permit Types & Fees. Supports: foundation repairs need a building permit. https://www.cudahy-wi.gov/departments/inspection/permit_types___fees.php
- Village of Germantown, Residential Permits General Information (PDF). Supports: foundation repairs need a permit. https://www.germantownwi.gov/DocumentCenter/View/182
- Wis. Stat. 709.03, Real Estate Condition Report, item B7. Supports: defects in the basement or foundation (including cracks, seepage, and bulges). https://docs.legis.wisconsin.gov/document/statutes/709.03