California CSLB Licensing Requirements: FAQs for California plumbers

California law requires two things of almost every C-36 plumbing contractor: workers' compensation insurance if you have one or more employees (Labor Code §3700), and a $25,000 contractor's license bond on file with CSLB. If your company is an LLC, the state adds a $100,000 employee/worker bond and general liability insurance of at least $1,000,000.

Everything else is required by the people who hire you rather than by the state. General contractors, property managers and commercial customers almost always require general liability (commonly $1,000,000 per occurrence), and many require commercial auto, a certificate naming them as additional insured, and sometimes an umbrella. Tools and equipment coverage is required by nobody but protects the gear in your vans, which no other policy covers.

Two timing points matter. A workers' compensation exemption on file becomes invalid the day you hire anyone, and CSLB must receive proof of coverage within 90 days of that hire. And under SB 1455, the exemption option for C-36 licensees ends on January 1, 2028, after which every licensee must carry workers' compensation regardless of employees.

Yes, for now, if you have no employees. CSLB will issue and renew a C-36 license with a workers' compensation exemption on file, which certifies under penalty of perjury that you have no employees. Five classifications (C-8, C-20, C-22, C-39 and C-61/D-49) cannot use the exemption and must carry coverage regardless; C-36 plumbing is not one of them.

Three limits apply. The exemption becomes invalid the moment you hire anyone subject to California workers' compensation law, even a helper for one job, and CSLB must receive a certificate of insurance within 90 days of the hire. Working with an invalid exemption exposes you to license suspension and the uninsured-employer penalties in the Labor Code. And the exemption option itself ends on January 1, 2028 under SB 1455 (which postponed SB 216's original January 1, 2026 date); after that, every licensed contractor must carry workers' compensation with or without employees.

If you have employees today, there is no path to a license without coverage: bind the policy before the first day of work, then file the certificate.

Your insurer notifies CSLB of the cancellation, and if you have employees and no replacement coverage on file, CSLB suspends the license. Work performed while suspended is treated as work by an unlicensed contractor, which under California law can bar you from collecting payment for it and expose you to having to return money already paid.

Separately, the Department of Industrial Relations enforces the uninsured-employer rules: operating without required coverage is a misdemeanor (Labor Code §3700.5) with a fine of not less than $10,000, a stop order can halt your use of employee labor, and civil penalties run to the greater of twice the premium you would have paid or $1,500 per employee. If a worker is injured during the gap, you pay the benefits directly.

If you receive a cancellation notice, call your producer the same day. Non-payment cancellations can usually be cured before the effective date; a carrier non-renewal needs a replacement policy bound before the old one expires, with the new certificate sent to CSLB.

Use CSLB's free Check a License tool at cslb.ca.gov. Search by license number, business name or personnel name. The record shows the license status (active, inactive, expired, suspended), the expiration date, classifications, the bond on file with its surety and effective date, the workers' compensation carrier and policy dates or the exemption, and any disciplinary history.

Check it at least quarterly and always after a bond or workers' compensation renewal. A suspension posts to the public record before CSLB's letter reaches you, and general contractors, property managers and lenders check this page before they sign with you. The two most common surprises are a bond or workers' compensation policy that renewed with the carrier but was never re-filed with CSLB, and a workers' compensation exemption still on file after the company hired its first employee.

Every licensee needs the $25,000 contractor's bond, which must be on file before CSLB issues, renews or reactivates the license. Two more apply in specific situations: a $25,000 bond of qualifying individual when the license is qualified by a responsible managing employee (RME) or by a responsible managing officer (RMO) who owns less than 10 percent of the voting stock, and a $100,000 LLC employee/worker bond for every limited liability company licensee. A disciplinary bond is required only to reinstate a license revoked for a license-law violation.

All of these are filed with CSLB, usually by the surety, and CSLB must receive a bond within 90 days of its effective date. See the bonds section for each one.

Yes. Business and Professions Code §7071.6.5 requires every LLC licensee to file a $100,000 surety bond for the benefit of employees and workers damaged by the LLC's failure to pay wages, interest on wages, fringe benefits or other contributions. It is in addition to the $25,000 contractor's bond and is required for issuance, reissuance, reinstatement, reactivation and renewal of the license (inactive licenses are exempt).

The same statute scheme also requires LLC licensees to carry general liability insurance of at least $1,000,000 (more above five personnel of record, capped at $5,000,000). Corporations, partnerships and sole proprietors do not file the $100,000 bond. If you are considering converting to an LLC, price both bonds and the liability policy before the conversion date so the license is not interrupted. Details and a request form are on the LLC bond page.

A $25,000 bond of qualifying individual (BQI) is required when a license is qualified by a responsible managing employee (RME), or by a responsible managing officer (RMO) who does not own at least 10 percent of the corporation's voting stock. It is filed in addition to the contractor's bond, and if a license has more than one qualifier, each must meet the requirement (B&P §7071.9).

An RMO who owns 10 percent or more of the voting stock does not post the bond; the corporation files a Bond of Qualifying Individual Exemption Certification instead. If ownership later drops below 10 percent, or the license adds an RME, the bond becomes required from that point. Order it with the application so CSLB receives it within 90 days of the effective date. See the BQI page.

Under current law, every licensed contractor, with or without employees, must carry workers' compensation insurance beginning January 1, 2028. Senate Bill 216 (2022) originally set that date at January 1, 2026; Senate Bill 1455 (2024) postponed it two years. Until then a C-36 licensee with no employees may keep a workers' compensation exemption on file.

For a sole-operator plumbing company the practical effect is a new annual policy, rated on the owner's payroll under the plumbing classifications, as a condition of keeping the license active. Legislative dates can move again, so check CSLB's workers' compensation page before relying on either date, and talk to a producer in 2027 rather than December 2027.

While suspended you may not contract or perform work requiring a license, and work done during the suspension is treated as unlicensed work: you can be barred from suing for payment, required to return money already paid, and disciplined by CSLB. The suspension shows on your public license record immediately.

The fix depends on the cause. For a bond suspension, CSLB needs a new bond (or a surety rescission notice) received within 90 days of its effective date; coverage must be continuous to avoid a break in licensing time, and a late bond is accepted retroactively only for circumstances beyond your control. For a workers' compensation suspension, CSLB needs a certificate of insurance from the new policy, or a valid exemption if you truly have no employees. A judgment or bond claim paid against you creates a separate suspension that a new bond alone does not lift; the judgment must be satisfied or bonded.

Before you assume you are fine, confirm the lift on CSLB's license check page rather than on the carrier's or surety's confirmation.