How to Check a Contractor's License in California

In California, any construction job of $1,000 or more (labor and materials) — or any job that needs a permit — legally requires a licensed contractor. Checking a license takes five minutes and is free — and yet most homeowners who get burned by an unlicensed or badly-licensed contractor never looked. Here's exactly what to check and what each field means.

Where to check

The Contractors State License Board (CSLB) runs the public lookup at cslb.ca.gov — search by license number, business name, or personnel name. Ask every bidder for their number up front; legitimate contractors print it on their cards, contracts, and vehicles because the law requires it on all advertising.

The six things to verify

• 1. Status: active. Suspended, expired, or inactive means walk away — no negotiation. Also check for a bond suspension history; it's visible in the record.
• 2. Classification matches your job. A "B" General Building license covers multi-trade remodels; a "B-2" covers non-structural residential remodeling; specialty licenses (C-10 electrical, C-36 plumbing, C-33 painting) cover single trades. A painter bidding your kitchen remodel is working outside their classification — which voids protections you'd otherwise have.
• 3. The name matches. The license must belong to the business entity on your contract — not a friend, a former employer, or "the company we work with." Borrowed licenses are a classic scheme, and your contract with an unlicensed entity is the problem.
• 4. Bond on file. California contractors must carry a $25,000 contractor bond. It's not insurance for your whole project, but its absence means the license isn't in good standing.
• 5. Workers' comp. The record shows whether they carry workers' compensation or claim the exemption (no employees). A contractor who claims the exemption but shows up with a regular crew deserves a follow-up question — if those workers are employees, an injury on your property can become your problem.
• 6. Disciplinary history and license age. Citations and revocations are public. So is the issue date — a license issued eight months ago behind a company claiming "25 years of experience" deserves a follow-up question.

Why it matters this much

Hiring unlicensed isn't just risky — it strips your protections. No bond, no license for the CSLB to discipline, likely no insurance, and if a worker is hurt, exposure lands on the homeowner. California law is actually ferocious in your favor here: where a license was required, an unlicensed contractor generally can't sue you to collect payment, and you can sue to recover what you already paid them, even for good work. The law wants you to check; the lookup is the whole enforcement system working for you.

Five minutes, then the real vetting

A clean license is the floor, not the decision. It tells you the contractor is legal — not that they're good, honest, or right for your project. That's what the interview, the red-flag check, and leveled bids are for. License verification is simply the step you never skip — I run it on every bidder before they ever see a client of mine, and several times a year it ends a conversation before it starts.