By LE Construction · Updated October 2026
| Project | Figure | Source |
|---|---|---|
| Typical brace-and-bolt retrofit by a contractor | $3,000–$7,000 | California Residential Mitigation Program |
| Earthquake Brace + Bolt base grant | Up to $3,000 | CRMP / EBB |
| EBB supplemental grant (household income $94,480 or less) | Up to $7,000 more | CRMP / EBB |
| Bids over $10,000 (permits and fees included) | Program asks for two directory bids | EBB Homeowner's Guide 2025 |
A seismic retrofit for an older raised-foundation house is one of the least expensive structural upgrades you can make, and one of the few that the state helps pay for. This guide covers the published cost range, how the Earthquake Brace + Bolt (EBB) grant offsets it, and what makes one house cost more than another.
These figures come from the program sources listed. Your price comes from a written bid after we inspect your crawlspace.
The published cost range
The California Residential Mitigation Program, which runs EBB, says a typical retrofit completed by a licensed contractor may cost $3,000 to $7,000, depending on the size and location of the house, contractor fees and the amount of materials and work involved.
That retrofit is specific: plywood or OSB bracing on the cripple walls, anchor bolts or plates tying the sill to the foundation, and water heater strapping, built to the state’s prescriptive standard plan.
What the grant pays
- Base grant: up to $3,000 toward the retrofit.
- Supplemental grant: up to $7,000 more for households with income of $94,480 or less.
- The grant is paid after the work passes final inspection and the paperwork is submitted. It can be paid to you or directly to the contractor, depending on what the invoice states.
- If a bid is over $10,000 including permits and fees, the program asks for two bids from contractors in its directory.
For many houses, the grant covers a large share of the cost.
What raises the cost
Size and shape of the house
Bracing and bolting are priced largely by the length of the foundation perimeter and cripple walls. A large or irregular house needs more of both.
Crawlspace access
Low crawlspaces slow the work. Some houses need the access opening enlarged, or parts of the work done from outside.
Sill and framing repairs
Bolts only hold in sound wood. Rotted or termite-damaged sill plates are replaced first, and that repair is often the biggest variable in a retrofit bid.
Houses outside the standard plan
Cripple walls over 4 feet, hillside foundations and deteriorated concrete need an engineered design. That adds engineering cost and takes the house outside the EBB grant.
What keeps it down
- Applying during the EBB registration window, if your ZIP code is eligible.
- Fixing leaks and drainage under the house before sills rot further.
- Combining the retrofit with other crawlspace work you are already planning, though EBB permits must be for the retrofit alone.
We are a registered EBB contractor. See our seismic retrofitting page, the Earthquake Brace + Bolt retrofit page and our article on how to apply in Ventura County.
Sources
- California Residential Mitigation Program, How much does an earthquake retrofit cost?
- CRMP, The Earthquake Brace + Bolt retrofit
- EBB Homeowner's Guide (2025)
Published figures are national or regional averages from the sources above and are not LE Construction quotes. Prices change; your written estimate is the number that counts.
Frequently asked questions
Can the grant cover the whole retrofit?
Sometimes. If a retrofit falls within the base grant amount, the grant can cover most or all of it, and income-eligible households can receive up to $7,000 more. Larger houses and repairs to rotted sills push costs above the grant. Your bid shows the full cost and what you would pay after the grant.
Why would my retrofit cost more than the typical range?
A long foundation perimeter, a very low crawlspace, rotted or termite-damaged sill plates, and difficult access all add labor and materials. Houses outside the standard plan, like those with cripple walls over 4 feet, need engineering, which adds design cost and is not covered by the grant.
Does the cost include the permit?
A retrofit needs a building permit and final inspection, and for EBB jobs the permit must be for the retrofit alone. Permit fees vary by city and the County. We include the permit in our bid so the number you see is the number you pay.
Is a retrofit worth it if I do not get the grant?
For a vulnerable older house, yes in our view. The cost is modest compared with many home projects, and it addresses two of the most common earthquake failures in raised-floor homes. CEA policyholders may also qualify for a premium discount after a retrofit.