2.2 California Commercial Property Insurance

Regulation and Rating of Admitted Commercial Property

Most California commercial property is written by admitted insurers — carriers licensed by the Department of Insurance and backed by the California Insurance Guarantee Association (CIGA) if they become insolvent. Admitted commercial property rates fall under Proposition 103, so the insurer files rates and must obtain the Insurance Commissioner's prior approval before use. Rates may not be excessive, inadequate, or unfairly discriminatory, and consumer intervenors may challenge a filing.

Commercial property is typically rated using ISO commercial lines rules and the Commercial Property Coverage Part, where the building and business personal property values, construction class (frame, joisted masonry, noncombustible, masonry noncombustible, modified fire-resistive, fire-resistive), occupancy, protection class (the area's fire-protection grade), and exposure drive the premium. Larger or unusual accounts may be (a)-rated (individually judgment-rated) when no manual rate fits.

Unlike personal lines, commercial cancellation/non-renewal notice timelines are governed by the California Insurance Code commercial provisions and the policy, not the homeowners 75-day rules.

California is an advisory loss cost state: rating organizations such as ISO file prospective loss costs rather than final rates, and each insurer files its own loss cost multiplier (LCM) to convert those loss costs into the rates it will charge. The carrier may deviate above or below the advisory loss costs, but every resulting rate still passes through Proposition 103 prior approval. Common California commercial property forms include the Building and Personal Property Coverage Form (CP 00 10), Business Income (and Extra Expense) coverage, and the Businessowners Policy (BOP) for eligible small accounts.

A vacant building loses coverage for certain perils and is subject to a loss-payment reduction (commonly 15%) when vacant beyond 60 consecutive days under the standard commercial property conditions.

Surplus Lines: When the Admitted Market Says No

When no admitted insurer will write a commercial property risk — a wildfire-exposed winery, a vacant building, a large catastrophe-exposed warehouse — coverage is placed in the surplus lines (non-admitted) market. Surplus lines insurers are not licensed in California and are not backed by CIGA, so the consumer carries more insolvency risk; in exchange they have rate and form freedom.

Because surplus lines carriers are exempt from Proposition 103 prior-approval rate filing and from standard-form requirements, they can price catastrophe-exposed property to actual risk and use manuscript wordings — which is precisely why hard-to-place wildfire risks gravitate there. The California Insurance Guarantee Association (CIGA) that pays claims of an insolvent admitted insurer does not respond for a non-admitted carrier, a distinction the exam likes to test against the admitted market's CIGA protection.

Placement is tightly controlled to protect the admitted market:

• Only a licensed surplus line broker may place surplus lines business.
• The broker must perform a diligent search of the admitted market and document it on the SL-2 Diligent Search Report, generally showing that admitted carriers actually writing that line declined the risk.
• The non-admitted insurer should appear on the LASLI (List of Approved Surplus Line Insurers) — the voluntary approved list that replaced the older LESLI — or otherwise meet eligibility standards.
• The insured receives a D-1 disclosure stating the carrier is non-admitted and not protected by the guarantee fund.

Two Diligent-Search Shortcuts

Surplus Lines Taxes and the FAIR Plan Commercial Layer

The 3% Premium Tax

California funds its oversight of non-admitted insurance through a 3% surplus lines premium tax. The surplus line broker is responsible for collecting and remitting this tax (it is not paid by the admitted-market insurer). The tax is calculated on the California taxable surplus line premium the broker transacts during the calendar year, plus a small Stamping Fee charged by the Surplus Line Association of California (SLA), which reviews and stamps each placement for compliance. Brokers must keep the SL-2 and policy records available for SLA and Department review.

FAIR Plan for Commercial Property

For commercial property that even surplus lines cannot economically absorb, the California FAIR Plan added a high-value commercial program effective July 2025. It offers limits up to roughly $20 million per building and an aggregate of about $100 million per location for HOAs, farms, and other businesses in wildfire-distressed areas — more than double the prior caps — and is intended as a temporary bridge scheduled to expire in 2028 as the admitted market recovers under the Sustainable Insurance Strategy.