Three things make California builders risk harder than other states: wildfire-zone underwriting, surplus lines paperwork, and earthquake exclusions. We’ve placed coverage for projects from Sacramento subdivisions to Malibu rebuilds, including the high-FHSZ work most carriers decline.

BuildersRiskNerd is a brand of ContractorNerd Insurance Services, LLC (CA License #6015566). We shop builders risk for residential and commercial projects in all 50 states. Tell us about the project. We come back with admitted-carrier quotes when you qualify and surplus lines when you don’t. The full builders risk overview covers the basics. This page covers California.

Quick answer: builders risk insurance in California

Builders risk insurance in California, often called course of construction insurance, covers projects against fire, theft, vandalism, and weather damage during the build. Wildfire exposure, surplus lines paperwork, and owner-builder rules make California one of the harder states to place. Moderate-risk zones place at admitted carriers. Higher Fire Hazard Severity Zones go to surplus lines.

Get a California builders risk quote. Submit project details once. See admitted and surplus lines options side by side. Start a quote →

California regulations and the CDI

The California Department of Insurance (CDI) regulates the admitted market, including carriers that file rates and forms for builders risk. When admitted carriers decline, brokers move to surplus lines.

Surplus lines placements require a “diligent search” of the admitted market first. The producer documents that at least three admitted carriers passed on the risk. Two forms get filed with the California Surplus Line Association: the SL-1 Confidential Report of Placement and the SL-2 Diligent Search Report. Both apply to new business and to extensions that push the policy past 90 days within a 12-month period.

Surplus lines premiums in California carry a 3% premium tax plus a 0.18% stamping fee. Both line items show up on the policy invoice. Buyers see them and assume the broker added a markup. The broker did not. The taxes go to the state and the SLA.

Most contractors never see this paperwork. The broker handles the filings, the diligent search, and the tax remittance. What the contractor sees is the rate. On surplus lines, rates run 30-100% higher than admitted lines for the same project, depending on FHSZ rating and TIV.

Wildfire zones and underwriting

California’s wildfire risk has reshaped the builders risk market. The driver is CalFire’s Fire Hazard Severity Zone (FHSZ) maps. The state classifies land into Moderate, High, and Very High FHSZ. Very High zones draw the strictest underwriting.

A project in a Very High FHSZ or Wildland-Urban Interface (WUI) zone gets one of three answers from the admitted market. A decline. A quote with a 5-10% wildfire deductible on TIV. Or a quote with defensible space and vegetation clearance as binding conditions.

The shift to surplus lines for wildfire-exposed projects is the dominant story in California builders risk over the past five years. Several admitted carriers pulled out of high-FHSZ business or capped their book at a small number of accounts. Surplus lines carriers stepped in. They charge for it. Rates of 3-8% of project value are normal for Very High FHSZ work.

Underwriters look at the site-specific FHSZ rating from the CalFire map, distance to the nearest hydrant, defensible space around the structure, roof type (Class A non-combustible roofs improve appetite), brush clearance plans, and whether the project is rebuilding in a recent burn scar. Burn scar rebuilds often carry a surcharge for years after the fire.

The California FAIR Plan sometimes comes up as a fallback. The FAIR Plan is mostly a homeowners’ residual market. It does offer a commercial property form, but the appetite for course of construction risks is narrow. For commercial wildfire-exposed BR in California, the placement path runs through surplus lines, not the FAIR Plan.

If the project sits near an FHSZ boundary, get the rating in writing from the broker before binding. CalFire updates the maps periodically. Boundary projects sometimes flip mid-build.

Earthquake DIC for builders risk

Standard builders risk policies exclude earth movement. That covers earthquakes, landslides, mudslides, and subsidence. The exclusion is universal. Carriers hold firm on it.

To fill the gap, contractors use a difference-in-conditions (DIC) policy. DIC is a separate standalone policy that picks up where the BR form leaves off. It covers earthquake, sometimes flood, and other earth-movement perils.

Most California lenders require DIC. The common triggers are high-value coastal and Bay Area builds, commercial projects above $5M in TIV, projects near known fault zones (San Andreas, Hayward, San Jacinto), and multi-family or condo construction where unit-owner equity is at stake.

DIC pricing in California runs 1-3% of building value annualized. On a $2M Bay Area project, that’s $20K-$60K of additional premium per year of construction. Some DIC forms place alongside the BR with the same broker. Others come from specialty earthquake markets and need a separate submission. A specialist broker matches the limits and deductibles between the two policies.

Earthquake DIC and the endorsements seismic projects need get a closer look on our endorsement breakdown.

Owner-builder rules in California

California lets people act as their own general contractor on personal residences without a contractor’s license. The legal basis is California Business and Professions Code Section 7044. The owner-builder declaration gets filed with the building department at permit issuance.

The rule sounds simple. The reality is messy.

Two things change the underwriting story on California owner-builder builds. First, lenders often treat owner-builder loans as higher-risk and require BR with specific endorsements (typically theft of installed materials, soft costs, and sometimes EQ DIC). Second, admitted carriers often decline owner-builder projects above $1M in TIV. They read the homeowner-as-GC profile as higher-loss.

Section 7044 also limits what owner-builders can legally do. Personal residences for the owner’s own use qualify. Selling within one year of completion triggers a rebuttable presumption that the project was built for sale, which puts it outside the personal-residence exemption. Selling five or more structures within a year creates a conclusive presumption of intent to sell.

For BR placement, the owner-builder distinction matters because the risk profile shifts. Carriers want to know who runs the job, who manages the trades, and who carries the GL. If the answer is “the homeowner,” placement options narrow.

For the full state-by-state breakdown including owner-builder rules and carrier appetite for self-built homes, see our owner-builder page.

Why “course of construction” is the dominant California term

Course of construction insurance and builders risk insurance are the same product. The terms are interchangeable. California uses “course of construction” more than other states for three reasons.

CDI rate filings historically used “course of construction” as the line designation. That carried into broker terminology and policy forms across the state. Lender documents from California construction-finance lenders, including the non-bank private lenders that fund a lot of CA project work, often use COC language. Surplus lines submissions and Lloyd’s syndicate forms (which place a lot of California risk) use COC too.

If your loan documents say “course of construction insurance,” that’s the same coverage we shop. The synonym breakdown including Lloyd’s and inland marine origins lives on our complete terminology guide.

California pricing

FHSZ ratings split California into three risk tiers, and pricing follows. Here’s what we typically see on submissions BuildersRiskNerd has placed.

Inland low-FHSZ projects (Sacramento Valley, Central Valley, Inland Empire flatlands) run 1.0-2.0% of project value. A $500K renovation often quotes at $5,000-$10,000 for a 12-month policy. Admitted markets are usually available.

Bay Area moderate-risk projects (urban East Bay, Peninsula, San Francisco proper) run 1.5-2.5%. A $1.5M custom home build often quotes at $22,500-$37,500 for an 18-month term. Most projects place admitted, though older construction and hillside lots often move to surplus lines.

High-FHSZ wildfire projects (Sonoma hills, Malibu, Santa Cruz mountains, Sierra foothills, parts of San Diego County) run 3-8%. A $2M rebuild in Malibu’s Very High FHSZ can quote at $60,000-$160,000 for a 12-month policy. Admitted markets are rare. Surplus lines is the standard path.

Other pricing factors layered on FHSZ: project type, term length (CA projects often need 18-24 months), TIV, the GC and owner claims history, and lender limit requirements.

A full breakdown of the cost factors that move builders risk premiums up or down sits on our cost page. California’s surplus-lines dynamic is not unique. Florida builders risk pricing is shaped by named-storm deductibles in a parallel way.

Patterns we see across California submissions

Three patterns repeat across CA builders risk submissions, regardless of project size or region.

Lenders push for EQ DIC late. The deeds-of-trust language often requires earthquake coverage even when the term sheet did not. Contractors learn this at funding, not at policy bind.

FHSZ ratings surprise people. Addresses contractors thought were Moderate often classify as High or Very High after a CalFire map update. Surplus lines pricing replaces admitted pricing overnight.

Owner-builder accounts almost always end up in surplus lines above $1M in TIV. The admitted appetite for homeowner-as-GC builds disappears around that threshold.

Knowing these patterns ahead of submission saves time, deductible surprises, and the awkward call to the lender.

When to upgrade or add endorsements

Most California projects need at least three endorsements beyond the basic BR form.

EQ DIC, when the project sits in a known seismic zone or the lender requires it.

Soft costs coverage, which pays for delay-related expenses (extended interest, redrawn permits, additional construction loan costs) when a covered loss pushes the project past schedule. This matters most on higher-value Bay Area and coastal builds.

Theft of installed materials, since the basic BR form sometimes excludes theft of items attached to the structure but before substantial completion.

Short-term renovations under $200K in moderate-risk zones with a licensed GC and no lender DIC requirement can run on a stripped BR form. The endorsement stack adds 5-15% to the premium and is not always worth it on small projects.

How to buy California builders risk through BuildersRiskNerd

Tell us about the project. Address, project value, term, GC license, owner-builder status. We pull the FHSZ rating during underwriting and shop the right markets based on the address.

Low-FHSZ projects come back with admitted-market quotes within 24-48 hours. High-FHSZ projects take 3-5 business days. Surplus lines carriers want defensible space details, vegetation plans, and roof type confirmation. Once you pick a quote, we help you bind with the carrier. The certificate gets emailed to the lender, GC, and owner. If a DIC layer is needed, that submission runs in parallel so both policies bind together.

Frequently asked questions

Is builders risk insurance the same as course of construction insurance in California?

Yes. Course of construction is California’s preferred term for the same product the rest of the country calls builders risk. Both names refer to a policy that covers a structure under construction against fire, theft, vandalism, and weather damage.

How much does builders risk insurance cost in California?

It depends on the project’s FHSZ rating. Inland low-FHSZ projects typically run 1.0-2.0% of project value. Bay Area moderate-risk projects run 1.5-2.5%. High-FHSZ wildfire projects run 3-8% and usually place in the surplus lines market.

Do I need earthquake coverage on my California builders risk policy?

Earthquake is excluded from every standard builders risk policy. To cover earth movement, you need a separate difference-in-conditions (DIC) policy. Most lenders on Bay Area, coastal, and high-value projects require it. DIC typically runs 1-3% of building value annualized.

Can owner-builders get builders risk coverage in California?

Yes. Placement options narrow above $1M in TIV. Many admitted carriers decline owner-builder projects at that level. Surplus lines markets pick up most of these accounts at 30-100% higher rates than the admitted market would charge a licensed GC.

Can I get builders risk insurance in a Very High FHSZ wildfire zone?

Usually yes, through surplus lines carriers. Expect rates of 3-8% of project value, defensible space requirements, and a wildfire deductible of 5-10% of TIV. Some Very High FHSZ projects in active burn scars face hard declines until vegetation regrowth and rebuild patterns settle.

Get a California builders risk quote

BuildersRiskNerd shops California course of construction coverage from admitted carriers for moderate-risk projects and from surplus lines markets for high-FHSZ and high-value work. We handle the SL-1 and SL-2 filings, the diligent search paperwork, and the EQ DIC placement when it’s needed. You get one submission, multiple quotes, and a broker who knows the difference between a Moderate FHSZ Sacramento renovation and a Very High FHSZ Malibu rebuild.

Start a California builders risk quote. Tell us about the project. We come back with admitted and surplus options that fit. Get a quote →

External resources

BuildersRiskNerd is a brand of ContractorNerd Insurance Services, LLC, a licensed insurance producer (CA License #6015566). All insurance products and services are offered through ContractorNerd Insurance Services, LLC. We’re a broker, not an insurer. Policies are underwritten by admitted and non-admitted carriers.