California earthquake retrofit requirements work on two tracks. Certain cities and counties require owners of high-risk multi-unit buildings — soft-story wood-frame, non-ductile concrete, and unreinforced masonry structures — to strengthen them by set deadlines. Everyone else, including single-family homeowners, retrofits voluntarily, and the state helps pay for it with grants of up to $3,000, or up to $10,000 for income-eligible households. There is no statewide law forcing every building to be retrofitted.
Which Buildings Must Be Retrofitted
Mandatory retrofit ordinances are adopted city by city, so the covered buildings, deadlines, and penalties depend on where the property sits. Los Angeles, San Francisco, Berkeley, Oakland, and San Diego all run active programs. They target three building types that have historically performed worst in earthquakes.
Soft-story buildings are multi-story wood-frame structures with a weak ground floor, usually because parking openings or storefronts leave the first story under-braced. During shaking the upper floors can pancake onto that weak level. Most ordinances cover soft-story buildings with three or more residential units, though the exact threshold varies. Los Angeles issued retrofit orders for roughly 13,500 soft-story buildings under its program.
Non-ductile concrete buildings were built before the 1976 Uniform Building Code introduced modern seismic reinforcement standards. Their concrete frames lack the steel reinforcement needed to flex, so they tend to crack and fail suddenly. Los Angeles gives owners of these buildings ten years from the retrofit order to complete a full structural evaluation and twenty-five years to finish all retrofit or demolition work.1American Legal Publishing. Los Angeles Municipal Code SEC. 91.9504 – Compliance Requirements Transferring ownership does not reset the clock.
Unreinforced masonry buildings are the third category — typically older brick structures with load-bearing walls that have no steel reinforcement. Los Angeles, San Francisco, Berkeley, Oakland, and San Diego all require retrofits or hazard reduction for these buildings, generally exempting single-family homes and small detached buildings with fewer than five units.
If your building doesn’t fall into one of these categories, no California ordinance is currently forcing you to retrofit. Single-family homes are not covered by mandatory programs anywhere in the state.
What Happens If You Miss a Retrofit Deadline
Missing a city retrofit deadline carries real consequences. A non-compliant building can be declared unsafe under the California Building Code, which may trigger a vacate order forcing the owner to relocate tenants at the owner’s expense. The violation gets recorded against the property title with the county recorder, creating problems for any future sale or refinance. Depending on the jurisdiction, continued non-compliance can be prosecuted as a misdemeanor with daily fines.
The general enforcement sequence starts when the city identifies a covered building and sends the owner a written order to retrofit. The owner then hires a licensed engineer or architect to evaluate the structure, submits retrofit plans to the building department, pulls permits, completes construction, and obtains a final inspection sign-off. Cities phase the timeline in stages, and missing any stage can escalate the enforcement.
What the Retrofit Work Involves
For older wood-frame houses the standard job is a brace-and-bolt retrofit. Bolting anchors the wooden frame to its concrete foundation with steel bolts or plate connectors so the house cannot slide off during shaking. Bracing applies when the home has a raised foundation with short cripple walls in the crawl space; plywood or oriented strand board is fastened to those walls to keep them from folding over.
These residential retrofits follow Chapter A3 of the California Existing Building Code, most recently updated in the 2022 edition.2International Code Council Digital Codes. California Existing Building Code – Chapter A3 Prescriptive Provisions for Seismic Strengthening of Cripple Walls and Sill Plate Anchorage of Light, Wood-Frame Residential Buildings Chapter A3 offers prescriptive, pre-engineered designs that a contractor can build to without custom engineering on every project.
Larger buildings need heavier work. Soft-story buildings usually get steel moment frames or plywood shear walls installed at the weak ground floor to redistribute lateral forces. Non-ductile concrete retrofits are more involved, often adding steel bracing, fiber-reinforced polymer wraps around columns, or new concrete shear walls. These projects require a licensed structural engineer for the design and a licensed contractor for the construction.
How Much a California Retrofit Costs
Cost tracks the building type. For a standard brace-and-bolt retrofit on a single-family home with a raised foundation, about 76% of projects completed through the state grant program cost less than $7,000.3California Residential Mitigation Program. How Much Does a Seismic Retrofit Cost in California Other configurations run higher:
- Post-and-pier foundations: $10,000 to $15,000, because these homes lack a continuous perimeter foundation and need a different engineering approach.
- Hillside homes: over $10,000, and sometimes considerably more, since the uneven terrain and tall support structures require custom engineering.
- Soft-story buildings: $15,000 to $25,000 on average for the ground-floor structural steel or shear wall work.
Add building permit and plan-check fees, which vary by city and are often calculated as a percentage of the project’s estimated value. Mandatory retrofits requiring an engineer’s analysis add professional fees that commonly run several hundred to over a thousand dollars depending on building size.
Grants to Help Homeowners Pay
Single-family homeowners are not required to retrofit, but the state’s Earthquake Brace + Bolt program pays a big share of the cost when they choose to. EBB offers grants of up to $3,000 toward a foundation bolting and cripple wall bracing retrofit on eligible homes.4California Department of Insurance. Earthquake Brace and Bolt Grant Program Opens for 2025 Applications The home must be wood-framed, built before 1980, on a raised foundation, and located in one of more than 1,100 eligible zip codes designated as higher-hazard areas.
Homeowners with a household income at or below $89,040 can qualify for a supplemental grant of up to $7,000 on top of the base $3,000, bringing total assistance to $10,000. For many homes that covers the full cost of the work. Starting in 2025, EBB opened to non-primary residential properties, giving landlords and rental owners access to the grants for the first time.5California Earthquake Authority. Earthquake Brace and Bolt Grant Program Opens Again for 2025
Registration opens for a limited window each year on a first-come, first-served basis. The 2025 cycle ran from August 20 through October 1. Because the program uses Chapter A3 prescriptive standards, most homeowners can complete the work with pre-approved plans rather than paying for custom engineering.
Other Financial Help
Commercial owners facing six-figure retrofit costs can look to the California Capital Access Program’s Seismic Safety Financing Program. Run through the State Treasurer’s Office, CalCAP creates a loan loss reserve that reduces lender risk and encourages private banks to make seismic retrofit loans on residential and commercial properties.6California State Treasurer’s Office. CalCAP Seismic Safety Main Page
At the federal level, FEMA’s Hazard Mitigation Grant Program can fund residential seismic retrofitting, but property owners cannot apply directly. Local governments must apply on their behalf, and the community must have an adopted hazard mitigation plan.7FEMA. Hazard Mitigation Grant Program (HMGP) In practice this funding is most accessible after a presidential disaster declaration.
One benefit many owners miss is the seismic retrofit property tax exclusion. Under California Revenue and Taxation Code Section 74.5, the value added by seismic retrofit work is excluded from property tax reassessment, so your property taxes do not rise because of the retrofit. To claim the exclusion, notify the county assessor before or within 30 days of completion, and file all supporting documents within six months.8California Legislative Information. California Code Revenue and Taxation Code 74.5 – New Construction Your contractor or engineer must certify which portions of the work qualify, and the building department reports those costs to the assessor.
Completing an EBB-standard retrofit can also cut earthquake insurance costs. The California Earthquake Authority offers a Hazard Reduction Discount on wood-frame homes built before 1980 with one to four units:9California Earthquake Authority. Earthquake Insurance Policy Premium Discounts
- Homes built 1940–1979 on a raised foundation: 20%.
- Homes built 1940–1979 on another non-slab foundation: 10%.
- Homes built 1939 or earlier on a raised foundation: 25%.
- Homes built 1939 or earlier on another non-slab foundation: 15%.
The retrofit must meet California standards, and your water heater must be properly secured to the building frame. A perfectly good structural retrofit will not trigger the discount if the water heater is not strapped.
Permits and Inspections
Every seismic retrofit in California requires a building permit from the local city or county before work begins. Prescriptive brace-and-bolt retrofits on single-family homes move quickly because the designs follow pre-approved Chapter A3 standards, and many jurisdictions offer expedited or over-the-counter permits for them.
Mandatory retrofits on larger buildings require engineered plans prepared by a California-licensed structural engineer or architect. Plan review takes longer and often comes back with required revisions. Construction must be performed by a licensed contractor, though California allows homeowners to act as owner-builders on their own residential property. That path is realistic for a simple bolt job and inadvisable for anything structural.
The building department inspects at key stages during construction to verify the work matches the approved plans. After final inspection the department issues a completion record. That completion date starts the 30-day clock for notifying the assessor about the property tax exclusion, and on mandatory retrofit projects it also clears the enforcement flag on the property title.
Disclosure When Selling a Retrofitted or Unretrofitted Property
If you sell a home in California, you must tell the buyer whether the property sits in an earthquake fault zone or seismic hazard zone. This runs through the Natural Hazard Disclosure Statement, which covers earthquake risks alongside flood and fire hazards.10California Legislative Information. California Civil Code 1103.2 – Natural Hazard Disclosure Statement Where available maps are not detailed enough to tell, the seller defaults to marking “Yes.” Failing to provide the disclosure exposes the seller to liability for the buyer’s actual damages.11California Legislative Information. California Civil Code 1103 – Natural Hazard Disclosure Requirements
Commercial sellers carry more. If the building was constructed before 1975 with concrete or masonry walls and wood-frame floors or roofs, the seller must give the buyer a copy of the state’s Commercial Property Owner’s Guide to Earthquake Safety, along with a disclosure report addressing whether unreinforced masonry walls have been strengthened, whether a pre-1980 concrete building has adequate steel reinforcement, and whether a soft-story building has been retrofitted.12California Governor’s Office of Emergency Services. Commercial Property Owners Guide to Earthquake Safety 2022 Sellers are not required to open walls or hire an engineer to answer, but answering “no” or “unknown” to multiple questions signals risk to a buyer.