How to Verify a Contractor's Insurance in California

Why a Valid CSLB License Doesn't Mean Your Contractor Is Insured

You found the perfect contractor: active license, strong reviews, fair bid. But when you check the CSLB record, everything looks green — and that's exactly where most homeowners stop too soon. Licensing and insurance are separate matters, and a valid CSLB license alone tells you nothing about whether your contractor is actually insured.

The CSLB's free Check a License tool lets you confirm a license is active, verify the classification matches your project, and review complaint disclosures. It takes under five minutes and the CSLB recommends doing it before signing any contract.

What it doesn't do is prove insurance is in place. As one state insurance regulator puts it, "Consumers are often surprised to learn that licensing and insurance are separate matters." A license number on a business card or website proves neither active coverage nor a current bond — and the CSLB's required $25,000 contractor license bond is a surety guarantee, not insurance.

Here's the biggest gap: KQED reporting found that 53% of California's 230,000+ active licensed contractors — roughly 123,000 — claim exemption from workers' comp by stating they have no employees. Regulators say many make that claim falsely.

The CSLB issues hundreds of stop-work orders annually to contractors caught with employees despite exemption claims, but its own chief of legislation admits enforcement "has not moved the proverbial needle" because the board lacks staff to audit all exemption claimants. A contractor who files a no-employee exemption but shows up with a crew is breaking the law — and shifting enormous risk onto you.

If an uninsured worker is injured on your property, you can be held liable for the injury. Beyond that, skipping insurance verification risks:

• Uninsured worker injury claims landing on your homeowner's policy — or being denied outright
• Permit and inspection problems that surface at resale
• No bond protection if the contractor abandons the job or performs defective work
• Difficulty securing financing or insurance cooperation on future transactions

The stakes are not theoretical: three heavy equipment operators died in the 2016–2018 wildfires while working for contractors who lacked workers' comp coverage.

The license check is step one, not the whole process. The Altadena Builder Directory confirms every listing's license against the current CSLB record and displays a verification seal once a match is confirmed — but that's a starting point, not a substitute for requesting a certificate of insurance and confirming it directly with the insurer. Fraudulent insurance documents have occurred in the industry, so a certificate alone isn't proof either.

Ask directly: how many workers will be on site, and what covers each of them? Any contractor who becomes defensive about that question is one you should avoid.

The 4-Step Verification Process: License, Certificate, Insurer, Crew

Verifying a contractor's insurance takes less than ten minutes, yet most homeowners skip the steps that matter most. A valid license tells you almost nothing about coverage — regulators note that licensing and insurance are entirely separate matters. Here's the four-step process that closes that gap.

Step 1: Confirm the license through CSLB. Start with the free "Check a License" tool from the California Contractors State License Board, which licenses roughly 285,000 contractors across 45 classifications. Confirm the license is Active, that it belongs to the person standing in front of you, and that the classification matches your project. Verification takes under five minutes, and you can also call (800) 321-CSLB.

Step 2: Get a certificate of insurance — in writing. Never accept verbal assurances. Ask for a certificate of insurance issued directly by the contractor's insurer or agent, covering general liability and workers' compensation. As one state insurance commissioner puts it, homeowners should never assume coverage exists simply because someone says they're covered.

Step 3: Call the insurer yourself. A certificate is only a summary document — it does not guarantee coverage is active. California-focused guidance recommends confirming directly with the insurance company, because fraudulent insurance documents have occurred in the construction industry. A five-minute call to the insurer's policyholder line confirms the policy is in force.

Step 4: Probe the workers' comp exemption. This is the biggest gap in the entire system. According to KQED's reporting, 53% of California's 230,000+ active licensed contractors claim exemption from workers' comp by stating they have no employees — and regulators say many make that claim falsely. Ask exactly who will be on your property:

• How many workers will be on site, and are they employees or subcontractors?
• Who covers each subcontractor's workers' comp and liability?
• Can the contractor provide proof of coverage for every person on the crew?

A contractor who files a no-employee exemption but brings a crew to your home is breaking the law — and shifting injury liability onto you. Directories like the Altadena Builder Directory can streamline step one by matching listings against CSLB records, but insurance verification is always your job. Re-run all four steps close to your signing date, since license status and policies can change at any time.

Red Flags That Should End the Conversation

Some warning signs aren't subtle — they're flashing. When a contractor hesitates over a license number or bristles at an insurance question, the conversation is already over, and the smartest thing you can do is end it.

The clearest disqualifier is refusing to share a license number. Industry guidance is blunt: "If they can't or won't provide a license number, that's an immediate cancellation on your end." California law requires licensed contractors to include their number in all advertising, including internet ads and directory listings, so a contractor without one at the ready is failing the most basic test.

Defensiveness about insurance is just as telling. As one remodeling guide puts it, any contractor who is reluctant to share their license number or becomes defensive when you ask about insurance is a contractor you should avoid. Legitimate professionals answer these questions routinely — they carry workers' comp, general liability, and a $25,000 license bond, and they know verification is part of the job.

Watch for these specific red flags:

• No license number offered, or a number that can't be found in the CSLB's live record
• Anger, evasion, or "trust me" answers when you ask about insurance
• Yelp, Nextdoor, or Facebook profiles, reviews, or screenshots offered as proof instead of a live CSLB lookup
• A workers' comp exemption claim paired with a crew showing up at your door

That last one deserves special attention. 53% of California's 230,000+ active licensed contractors claim a workers' comp exemption by stating they have no employees, and as KQED has reported, regulators say many make that claim falsely. A contractor who files an exemption but brings workers to your home is breaking the law — and if one of those workers is injured on your property, the liability risk lands on you.

Online profiles deserve their own caution. A profile is not verification, a review is not verification, and a claimed license number is not verification — a number may belong to someone else, be expired, or be used without authorization. The only acceptable proof is the current official CSLB record, checked yourself.

This is why the Altadena Builder Directory verifies every listing against the CSLB and displays a verification seal only after a license match is confirmed. It removes the guesswork from the first screen — but even with a verified shortlist, you should still request a certificate of insurance and confirm it directly with the insurer before signing anything.

Verify With Our Free CSLB Lookup Tool

You've gathered the license number, requested the certificate of insurance, and probed the workers' comp exemption. Now comes the final step — and it takes less time than brewing a pot of coffee. Verification through the CSLB takes under 5 minutes and is completely free, with phone support at (800) 321-CSLB if you prefer to confirm by voice.

The Altadena Builder Directory offers a free CSLB license-lookup tool that pulls the same official records, so you can verify any California contractor — whether you found them on a jobsite sign, a flyer, or a neighbor's recommendation — in one place. License data is attributed directly to the California Contractors State License Board, which has regulated the state's construction industry since 1929 and licenses roughly 285,000 contractors across 45 classifications.

If you're hiring closer to home, browse the Altadena Builder Directory registry itself. Every listing — from ADU builders and custom home builders to remodelers, fire-rebuild specialists, and design-build firms — is license-verified against CSLB records and displays a verification seal once the license match is confirmed. Ratings come only from real, attributed public sources, and there are no paid rankings; any featured placement, such as JMB Builders LLC (CSLB #1103479), is always clearly labeled as paid.

One caution before you sign anything: license status can change between your first check and your signing date. A license that was active last month could be suspended, revoked, or inactive today — and a stale screenshot or old invoice proves nothing. As one verification guide puts it, a profile is not verification, a review is not verification, and a claimed license number is not verification. Only the current official CSLB record counts.

Before signing, run your final check:

• Re-run the license lookup within a few days of signing to confirm the status is still "Active."
• Confirm the classification still matches the work you're hiring for.
• Verify the bond is current — every licensed contractor must maintain a $25,000 contractor license bond.
• Remember that a CSLB check confirms the license, not the insurance — request the certificate of insurance separately and confirm it with the insurer.

A five-minute check is the cheapest insurance you'll ever buy — and with the CSLB receiving over 20,000 complaints annually, it's five minutes well spent before you hand over a deposit.