What crack repair does, and what moves California foundations
Crack repair means sealing or injecting the crack. California sources document two causes of the movement behind it: shrink-swell clay, which a 2024 SCAG regional report says can crack and lift foundations and slabs, and ground failure in the liquefaction and landslide zones the state geologist maps.
No source we have ties a given crack to a given cause. Telling which one opened yours takes an on-site look.
Crack repair estimates for California
A crack repair is priced here per repair at $295 to $945 per crack repair, an estimate and not a quote, built from three national published ranges and adjusted for California wages. Cement mason pay is shown beside it, and neither row is a price a contractor will charge.
| Item | Figure | What it is |
|---|---|---|
| Estimated range, not a quote | $295 to $945 per crack repair | Built from 3 national published ranges, adjusted by the California cement mason wage ratio (1.18). Two California foundation companies publish prices (Quartz Construction in San Jose, a range table; Avalon Structural near San Jose, inspection fees); that is too few to anchor a California range, so no company price moves the estimate. Basis: no state company sample (no counted California company price for this job), national estimate only. |
| Cement masons and concrete finishers, California mean | $34.09 an hour | California mean hourly pay, BLS May 2025. Workers earn this; it isn't a charge to you. |
| Cement masons and concrete finishers, United States mean | $28.87 an hour | U.S. mean pay from that release; the ratio of the two adjusts the estimate. |
Estimated range. Built from national published ranges (3 sources), adjusted by California's cement mason wage ratio to the US (1.18, BLS May 2025). Not a quote. Only two of the 18 California foundation companies we looked at publish a price we could count, so no company price anchors the estimates. We have no counted California company price for this job, so the range is our national estimate alone. Full method. Prices as of Oct 23, 2026.
Get the crack assessed by someone who won't sell the repair
The company that finds the crack is often the one pricing the fix. Ask who writes the report and whether the same firm would do the work.
If you're buying, the seller's Natural Hazard Disclosure Statement says whether the lot lies in a fault, liquefaction or landslide zone, so hand it to whoever assesses the crack.
When crack work needs a CSLB license
Under B&P 7048, minor work under $1,000 that needs no building permit and uses no hired help can be done without a license. Splitting a job into small contracts to stay under that line is barred, and the exemption ends if the person advertises as a contractor. Above it, the contractor needs a CSLB license, and the classes whose definitions fit crack work are C-8 concrete, the C-61/D-06 concrete related services class or B, which is our interpretation.
An unlicensed contractor can't sue you for payment, and you can sue to get back what you paid. CSLB, though, says it can't make an unlicensed person repair the work or pay you back. Check the number on CSLB's Check a License page before anyone starts.
Who decides if a crack seal needs a permit
The state code asks for a permit before a building is repaired or altered, and the building official in your city or county decides whether a crack seal counts. Nothing we have addresses crack injection by name, so phone the office and have the contractor write its answer into the contract.
Crack signs that mean act today
- A crack has lengthened or widened since you marked it, or the wall beside it has shifted.
- Water is seeping through a crack near the electrical panel or outlets, so keep out of the water.
- A crack that matches your pencil marks from months ago and stays dry.
- A hairline floor crack with no water and no height difference across it.
Steps to take before you phone about a crack
- Lay a coin beside the crack and photograph it, pencil a line across each end with the date, and look again in a few weeks.
- After a rain, check whether water shows at the crack, and whether the wall on either side has shifted.
- Before any company inspects, ask whether it also does the repair.
Crack repair: the permit and the license
Your city or county building office decides whether a crack repair needs a permit, and a job that does need one cannot use the under-$1,000 license exemption. Ask first, then have the contract say who handles it.
Ask for the contractor's license number and check it with your state licensing agency before you sign anything.
Questions people ask
How worried should you be about a foundation crack?
Watch it before deciding. Mark the ends with the date, photograph it with a coin for scale, and if it grows or lets water in, have someone who won't sell the repair assess it.
What does it cost to repair a foundation crack in California?
That range comes from three national ranges adjusted for California wages, with no California company price behind it. Ask for the method, the permit position and the license number in writing.
Will sealing a foundation crack need a permit in California?
The state code asks for a permit before a building is repaired, and no source we have names crack sealing either way. Call the office that covers your address before work starts.
Who may seal a foundation crack for pay in California?
B&P 7048 exempts only minor work under $1,000 with no permit and no hired help, and the exemption ends if the person advertises as a contractor. Run the number through CSLB's Check a License page.
May I seal a foundation crack on my own?
B&P 7044 exempts an owner who improves their own property, with nothing offered for sale, when the owner does the work personally or with wage employees or contracts directly with contractors holding a CSLB license. Selling within a year raises a presumption that the work was for sale.
- SCAG Connect SoCal 2024 Draft PEIR, Section 3.7 Geology and Soils Read Oct 20, 2026. Confirm it with the source itself before relying on it.
- CGS Seismic Hazards Program (with EQ Zapp page) Read Oct 20, 2026.
- Civil Code 1103.2 (leginfo) Read Oct 20, 2026.
- B&P Code 7048 (leginfo) Read Oct 20, 2026.
- CSLB: What kind of contractor do I need? (with the classification pages and crmp.org ESS page) Read Oct 20, 2026. Confirm it with the source itself before relying on it.
- CSLB Licensing Classifications Detail: C-8 Concrete Contractor Read Oct 20, 2026.
- CSLB: C-61 Limited Specialty classifications list Read Oct 20, 2026.
- B&P Code 7031 (leginfo) Read Oct 20, 2026.
- CSLB: How the complaint process works (and Complaint process against unlicensed contractors) Read Oct 20, 2026.
- CSLB Check a License Read Oct 20, 2026.
- CSLB: Do I need a building permit for my project? Read Oct 20, 2026.
- U.S. Bureau of Labor Statistics, OEWS May 2025: Cement Masons and Concrete Finishers (SOC 47-2051), California, mean hourly wage Read Oct 23, 2026.
- U.S. Bureau of Labor Statistics, OEWS May 2025: Cement Masons and Concrete Finishers (SOC 47-2051), United States, mean hourly wage Read Oct 23, 2026.
- FoundationMatch: how we estimate costs, California (editorial policy) Read Oct 23, 2026.
- B&P Code 7044 (leginfo) Read Oct 20, 2026.