California builders risk insurance is a temporary property policy that protects a construction project from physical loss while it’s being built or substantially renovated, usually written for a 12-month term. Premiums generally run between 1% and 4% of the project’s total completed value, with projects in wildfire, seismic, or flood-exposed areas landing at the upper end or pushed into the surplus lines market. In California, the standard off-the-shelf policy almost never gives you enough protection on its own.
What the Policy Covers
Most builders risk policies are written on an open-peril basis, sometimes called “all-risk.” That means any sudden, accidental physical loss to the project is covered unless the policy specifically excludes it. Named-peril policies, by contrast, only pay for the handful of events listed in the contract.
Covered losses under a typical open-peril policy include fire, windstorm, lightning, hail, explosion, theft, and vandalism. Coverage usually reaches beyond the structure itself to include building materials stored on-site, materials temporarily stored elsewhere, and materials in transit. Temporary structures that support the build, such as scaffolding, fencing, and storage containers, are generally covered too.
Collapse is where coverage gets subtle. An accidental collapse caused by something like excavation work or equipment failure is usually covered. A collapse that traces back to a design flaw or poor workmanship is not. The line between an accidental event and a construction defect is exactly where coverage disputes tend to happen.
What’s Excluded
Several categories of loss fall outside standard builders risk coverage even with the open-peril framework:
- Faulty workmanship and design defects. The policy is not a warranty on construction quality. If a subcontractor installs plumbing incorrectly and it fails, redoing that work isn’t covered, though resulting damage to other parts of the project may be, depending on the policy’s “resulting loss” language.
- Wear and tear, rust, corrosion, and mold from ongoing conditions. These are maintenance issues, not insurable events.
- Employee theft. Standard builders risk excludes losses from employee dishonesty; a separate commercial crime policy or fidelity bond fills that gap.
- Earth movement and flood. Earthquake and flood damage require separate endorsements or standalone policies.
The faulty workmanship exclusion is worth extra attention because it’s the most litigated provision in builders risk claims. The industry uses tiered exclusion language known as LEG 1, LEG 2, and LEG 3, named after the London Engineering Group that developed them. LEG 1 is the broadest, barring coverage for both the defective work and any damage it causes. LEG 3 is the narrowest, excluding only the cost of redoing the defective work itself while covering resulting damage. Which version appears in your policy fundamentally changes your protection, so read the clause before you sign.
Earthquake, Flood, and Wildfire in California
California’s natural hazard profile makes standard builders risk coverage dangerously incomplete. Three exposures each need their own solution.
Earthquake
Earthquake damage is excluded from every standard builders risk policy. In California, an earthquake endorsement is effectively mandatory for any significant project. These endorsements carry their own deductibles, often calculated as a percentage of project value rather than a flat dollar amount. A 5% deductible on a $2 million project means $100,000 out of pocket before coverage responds. Projects in designated seismic hazard zones may face higher deductibles or limited availability.
Flood
Flood is also excluded under standard builders risk. Projects in FEMA-designated flood zones need either a flood endorsement or a separate flood policy. Lenders funding projects in Special Flood Hazard Areas will require proof of flood coverage before releasing construction draws.
Wildfire
Fire is technically a covered peril, but “fire” and “wildfire in California” are increasingly treated as different risks by insurers. The January 2025 Los Angeles wildfires generated an estimated $25 to $30 billion in insured losses across the region, further tightening an already constrained market.1Moody’s. One Year After the 2025 Los Angeles Fires Projects in high-risk wildfire zones face significantly elevated premiums, higher deductibles, or outright coverage denials from admitted carriers. Even projects outside mapped wildfire zones may feel the pressure, because insurers reassessing California exposure sometimes pull back from the entire state rather than drawing fine geographic lines.
Placing Coverage in a Tight Market
California’s property insurance market has been under severe stress since the catastrophic wildfire seasons of 2017 and 2018, and the January 2025 fires accelerated the trend. For builders risk, that means fewer admitted carriers writing policies, longer lead times, and higher premiums.
When admitted carriers decline a project, contractors and owners often turn to the surplus lines market. Surplus lines insurers aren’t bound by the same rate regulations as admitted carriers, which gives them flexibility to price and write risks the admitted market won’t touch. The trade-off: surplus lines policies aren’t backed by the California Insurance Guarantee Association if the insurer becomes insolvent, so the financial strength of the carrier matters more than usual.
For residential projects where no private insurer will provide fire coverage, the California FAIR Plan serves as the insurer of last resort, offering basic fire and limited perils coverage for high-risk properties. A Difference in Conditions (DIC) policy is typically purchased alongside it to fill gaps like theft, water damage, and liability.2The California FAIR Plan. Difference in Conditions (DIC) The FAIR Plan itself does not offer DIC policies; those come from separate private insurers.
California Insurance Code Section 675.1 prohibits insurers from canceling or non-renewing residential policies in areas within or adjacent to a fire perimeter for one year after the Governor declares a state of emergency.3California Department of Insurance. Mandatory One Year Moratorium on Non-Renewals That protection applies to existing residential policies, so builders working on commercial projects or new ground-up construction shouldn’t count on it. Secure your builders risk coverage early in project planning, because finding a policy mid-project in a fire-affected area can be extremely difficult.
What It Costs
Premiums in California generally fall between 1% and 4% of total completed project value. A $500,000 residential renovation might carry a premium around $5,000 to $7,500. A $5 million ground-up commercial project could cost $50,000 to $200,000 depending on location and risk factors. The wide range reflects several variables:
- Location. Projects in wildfire-prone areas, flood zones, or high-seismicity regions pay significantly more. A project in downtown San Francisco faces different pricing than one in a low-risk Sacramento suburb.
- Construction type. Wood-frame buildings cost more to insure than steel or concrete because of higher fire and wind vulnerability.
- Project scope and duration. Longer projects mean more time exposed to risk, and renovations involving occupied structures carry higher premiums.
- Endorsements. Adding earthquake, flood, or soft costs coverage increases the total premium, sometimes substantially.
- Deductible selection. Standard deductibles range from $1,000 to $5,000 for most perils, with earthquake and flood deductibles often set as a percentage of project value. A higher deductible lowers the premium but increases out-of-pocket exposure.
Lead time matters as much as price. Starting the placement process during preconstruction gives you more carrier options and better leverage. Waiting until construction is imminent, especially in high-risk areas, often means scrambling into the surplus lines market at significantly higher cost.
Who Buys the Policy and How Long It Lasts
There’s no universal rule on whether the owner or the general contractor buys the policy. The construction contract typically spells it out. Most often the property owner purchases coverage because the owner has the largest financial stake in the finished project, and then lists the general contractor and subcontractors as additional insureds. On projects with multiple parties or complex financing, the general contractor sometimes secures the policy and names the owner and subcontractors as additional insureds instead. Either arrangement works. The important part is making sure every party with a financial interest in the project appears on the policy, so the insurer doesn’t later try to subrogate against an unlisted subcontractor to recover what it paid out.
Lenders almost always require builders risk coverage as a condition of funding a construction loan. The loan agreement will usually specify minimum coverage limits and require the lender to be named as a loss payee.
Builders risk is temporary by design. Coverage begins when construction starts or when materials first arrive at the site, whichever comes first. The policy terminates at the earliest of several triggering events: substantial completion, occupancy or use of the building, or formal owner acceptance. Once any of those triggers, the policy stops responding to losses whether or not a permanent policy is in place. If a developer begins leasing units in a partially completed building, the occupied portions may lose builders risk coverage immediately. Start shopping for permanent commercial property or homeowner’s insurance well before substantial completion, and coordinate effective dates so there’s no lapse. Extensions for projects that run long are available, but they aren’t automatic; you need to request the extension and pay additional premium before the original term expires.
The Coinsurance Trap
Builders risk policies typically carry a 100% coinsurance requirement, meaning the policy limit must equal the full completed value of the project. If the project’s actual completed value exceeds your policy limit at the time of a loss, the insurer reduces its payout proportionally. If your limit is $1 million but completed value has grown to $1.25 million, you’re insured for 80% of the value. On a $200,000 loss, the insurer pays $160,000 and you absorb $40,000. That penalty applies even though you paid premiums the entire time. The fix is simple but easy to neglect: review your policy limit as the project progresses, and file endorsements to increase coverage when costs escalate beyond the original estimate.
Soft Costs and Delay in Completion
Standard builders risk policies cover the hard costs of physical damage, such as rebuilding a fire-damaged wall. What they don’t cover, unless you add an endorsement, are the soft costs that pile up when a covered loss delays your project. Delay in completion coverage, sometimes called delayed opening or soft costs coverage, is an optional endorsement available on most builders risk policies.4IRMI. Delayed Completion Coverage Typical covered soft costs include:
- Extra months of interest on your construction loan while the project sits idle.
- Ongoing property tax obligations that don’t pause because the project stalled.
- Additional architect, engineer, or consultant charges for redesign or extended oversight.
- The cost of extending builders risk and other policies beyond the original term.
- Rental income you would have earned if the building had opened on schedule.
The endorsement only kicks in when the delay results from a covered physical loss. If an earthquake damages the framing and you carry earthquake coverage, the delay endorsement covers the associated soft costs. If you don’t carry earthquake coverage, neither the physical damage nor the delay costs are covered. Skipping one endorsement can create a cascade of uninsured losses.
Builders Risk Is Not General Liability
Builders risk and commercial general liability (CGL) insurance protect against fundamentally different things, and a construction project needs both. Builders risk is first-party coverage: it protects the building itself from physical damage. If a fire destroys the framing, builders risk pays to rebuild it. CGL is third-party coverage: it protects the contractor or owner when someone else gets hurt or their property gets damaged because of the construction work. If a passerby is injured by falling debris, CGL responds. A contractor carrying only CGL has no coverage if the structure itself is damaged by a storm. An owner with builders risk but no CGL has no protection when a visitor trips over construction materials and sues. Lenders typically require evidence of both before releasing construction funds.