How to Check a Contractor's License and Insurance Before Signing

Why a License Number Alone Proves Nothing

Walk down any street in Altadena right now and you'll see contractor trucks parked six deep outside lots cleared by the Eaton Fire — each one with a license number stenciled on the door. Here's the problem: many homeowners signing six- and seven-figure rebuild contracts are treating that painted number as proof of legitimacy. It isn't.

The Contractors State License Board says it plainly: "Seeing a license number doesn't necessarily mean the license is valid." California law requires the number on all contractor advertising, but a number printed on a truck, flyer, or bid tells you nothing about whether the license is active, suspended, or expired — or whether it even belongs to the person standing in your driveway (CSLB guidance).

The stakes are higher in a fire-rebuild zone than anywhere else in the state. Contracting without a license on structures damaged in a Governor-declared emergency is a felony punishable by up to 3 years in prison and/or a $10,000 fine, and the LA County District Attorney has already filed felony charges against unlicensed contractors in a December operation targeting Eaton Canyon and other fire zones (LA County DA).

Why does this matter to you as the homeowner, not just to the contractor? Because unlicensed work strips away every consumer protection you'd otherwise have:

• No bond claim — the $25,000 contractor bond exists only for licensed work
• No access to CSLB's free dispute resolution, mediation, or arbitration
• No enforceable contract, and no board complaint process if things go wrong
• Potential personal liability if an uninsured worker is injured on your property

The CSLB confirms that consumers are not legally required to pay an unlicensed contractor — but that cuts both ways: you also can't sue to enforce quality standards that never legally existed (CSLB). Practitioners put it bluntly: a verified license is a floor, not a recommendation — and an unverified number isn't even a floor (Tricana Group).

This is why Altadena Custom Home Builder treats license verification as step one of any rebuild conversation, not a formality. Before you sign anything — whether it's a ground-up custom home, a tear-down, or an Eaton Fire rebuild — the number on the truck needs to become a status on a state record. The next few hundred thousand dollars of your life depends on the difference.

The 5-Minute CSLB Lookup: What to Check on the Record

The CSLB lookup takes about five minutes and costs nothing — yet as one practitioner puts it, "the single best filter before you write a check is the CSLB lookup," because it surfaces issues referrals rarely mention. Start at the official CSLB license search tool, and search by license number, not business name.

Name searches are the weak point: similar names return multiple records, and a dissolved entity can share a trade name with an active one, according to license-verification guidance. California law requires the license number on all contractor advertising, so if a bid doesn't show one, ask for it — or call (800) 321-CSLB.

Once the record loads, confirm the status reads Active. Inactive, Suspended, or Expired means the contractor cannot legally take new work at that moment — and a suspended license puts them in the same practical position as an unlicensed one. Then review the eight fields that matter:

• Business information — the exact legal name, suffix included (LLC vs. Inc.)
• Classifications — B (general building) covers two or more unrelated trades; C-39 roofing or C-10 electrical are narrower specialties
• Bond — California requires a $25,000 contractor bond, though it is narrow protection, not a warranty
• Workers' compensation — an exemption is a red flag if a crew will be on site
• Disciplinary history and license actions

The classification matters more than most homeowners realize. A C-39 roofer cannot legally take on a full kitchen remodel; a B general contractor can — which is what a ground-up custom home or Eaton Fire rebuild requires.

Now do the name match. The legal entity on the CSLB record must exactly match the contract signing party and the certificate of insurance. If the signing party does not hold the license, the license offers you nothing — this mismatch is one of the most common scam patterns, per CSLB lookup guides.

You can practice on a real record. JMB Builders LLC, the Altadena builder featured on this site (CSLB #1103479), is a verifiable example: pull up the number, confirm Active status, and check the classification against your project scope. At Altadena Custom Home Builder, we encourage every homeowner to run this exact check on any builder they interview — including ours.

One caution: a clean record is a floor, not a recommendation, and most consumer complaints never appear because they are resolved or dropped. Recheck the license the day you sign and again before final payment, since status can change silently between bid and contract.

Insurance and Bonds: What the CSLB Record Won't Tell You

A license check catches the obvious problems, but the CSLB record has a blind spot that catches homeowners off guard: it doesn't show general liability insurance at all. That means the coverage that protects your property from damage is invisible on the state's own database, and verifying it falls entirely on you.

Here's the catch most homeowners miss. A certificate of insurance naming you as "certificate holder" only proves you were sent a copy — it provides no actual protection. Real coverage requires an additional insured endorsement issued by the carrier and attached to the policy, as California contractor vetting guides explain. Request the certificate directly from the contractor's insurer, not just from the contractor.

Workers' compensation is where the liability risk gets personal. California contractors with employees must carry workers' comp, and if an uninsured worker is injured on your property, the CSLB warns you could be financially liable for injuries and rehabilitation. A workers' comp exemption on the license record is a red flag the moment a crew shows up on site.

What to request before signing:

• A certificate of insurance sent directly from the contractor's broker or carrier
• An additional insured endorsement in your name — not just a certificate holder copy
• Proof of workers' comp, especially if any crew will be on your property

Then there's the bond. Every California licensee posts a $25,000 contractor bond, which sounds reassuring until you understand its limits. The CSLB itself cautions that bonds "do not assure the financial or professional integrity or competency of a contractor," and the bond may not cover multiple complaints or projects exceeding its value. For a ground-up custom home or an Eaton Fire rebuild — projects that routinely run into the hundreds of thousands — $25,000 is a rounding error.

A bond is a narrow protection against certain violations. It is not a warranty on your project and not a source of repair funds for ordinary defects. Treat it as limited recourse when other channels fail, not as insurance for your build.

For Altadena homeowners weighing hillside rebuilds or SB 9 lot splits, this insurance gap matters more than most. Altadena Custom Home Builder walks clients through exactly these verification steps during a free build consultation, so the paperwork protects you before the first shovel breaks ground.

References, Bids, and Payment Terms That Protect You

A verified CSLB license tells you a contractor met the state's minimum bar — nothing more. As one licensing guide puts it, "a verified license is a floor, not a recommendation." The steps below turn that floor into an actual hiring decision.

Get three written bids on identical scope. The CSLB recommends at least three written bids compared against the same plans, specifications, and scope of work. If one bid comes in substantially lower, treat that as a warning: it may signal a mistake, missing work, or corner-cutting rather than a bargain.

Call three recent references — with phone numbers. A clean CSLB record won't reveal communication style, change order handling, or schedule realism, so ask each bidder for three recent references you can actually call. For an Altadena hillside or Eaton Fire rebuild, prioritize references from comparable projects: slope lots, tear-downs, or fire-zone work.

Watch the down payment. California caps home improvement down payments at 10% of the contract price or $1,000, whichever is less — with a narrow exception for the roughly two dozen licensees holding a Blanket Performance and Payment Bond. A request above that cap isn't just aggressive; it's a fraud flag.

Put it in writing. Verbal agreements are unenforceable in most California construction contexts under Business and Professions Code § 7159. Your contract should spell out scope, a payment schedule, and a dispute clause — and payment milestones should be tied to inspection sign-offs, not calendar dates.

Before signing, run this stop-and-resolve check:

• License record shows "Active" — recheck the day you sign and again before final payment.
• Certificate of insurance comes directly from the insurer, not just the contractor.
• Contract includes scope, payment schedule, and dispute resolution terms.
• Deposit is within the legal 10%/$1,000 cap.
• Contractor pulls permits without resistance.

One final signal worth heeding: if a contractor hesitates to give you a number — a license number, a reference, an insurer contact — the check has already told you what you need to know.

Altadena Custom Home Builder walks homeowners through this exact checklist as part of a free build consultation for custom homes, tear-downs, and Eaton Fire rebuild projects — and our featured builder, JMB Builders LLC (CSLB #1103479, disclosed paid placement), is one license number you can verify yourself in the CSLB lookup in under five minutes.

Red Flags to Walk Away — Especially in Eaton Fire Rebuilds

Some red flags don't warrant a second question — they warrant walking away. Here are the do-not-sign triggers that surface most often, and one that matters more than any other in Altadena right now.

• Name mismatch. The legal business name on the CSLB record must match the proposal, contract, and certificate of insurance. A mismatch is one of the most common scam patterns, per license verification guidance.
• Signing party doesn't hold the license. If the contract signer is "JMB Holdings Inc." but the license belongs to a different entity — even one with a similar name — the license offers you nothing.
• Workers' comp exemption with a crew on site. If a contractor claims an exemption but employees show up, an injury on your property can leave you financially liable.
• Deposit above the legal cap. California caps down payments at 10% of the contract price or $1,000, whichever is less, per CSLB hiring guidance. A larger ask is a fraud flag — only about two dozen licensees hold the rare Blanket Performance and Payment Bond exception.
• Permit resistance. A contractor who discourages pulling permits is asking you to absorb all the risk. Do not proceed.

The fire-rebuild warning deserves its own line: contracting without a license on structures damaged or destroyed in a Governor-declared emergency is a felony, punishable by up to 3 years in prison and/or a $10,000 fine. The LA County District Attorney has already filed felony charges against five unlicensed contractors in a December operation targeting fire zones including Eaton Canyon, and enforcement continues. The DA's office is also blunt about your position as a homeowner: you are still the victim of a crime even if you knowingly hired an unlicensed contractor, and you can report it to the CSLB.

The practical consequences compound quickly. You cannot legally be forced to pay an unlicensed contractor, but you also lose every consumer remedy — no bond claim, no CSLB arbitration, no dispute resolution — and an injured worker may pursue you as an employer, a risk many homeowner policies exclude. For Eaton Fire rebuilds specifically, verify the license the day you sign and again before final payment, since status can change silently between bid and contract.

Every contractor we feature on Altadena Custom Home Builder is disclosed and verifiable — for example, JMB Builders LLC holds CSLB #1103479, which you can look up yourself in about two minutes on the state's free lookup tool. A verified license is a floor, not a recommendation; if you'd like help applying this full checklist to your own hillside lot, SB 9 split, or Eaton Fire rebuild, request a free build consultation and we'll walk through it together.