How to File a Complaint Against a Contractor in California: CSLB Complaints vs Bond Claims

Short answer: California homeowners have two separate routes for seeking help. A CSLB complaint asks the Contractors State License Board to look at possible violations of the contractor license law. CSLB may mediate, refer the dispute to arbitration, or discipline the license, but CSLB says plainly that its investigations are not designed to obtain restitution. A bond claim goes to the surety company that wrote the contractor's $25,000 license bond. You file it with the surety, not with CSLB. You can pursue both, and either can sit alongside small claims or a lawsuit. The table below shows which route fits which goal.

This is general information current to 3 October 2026, not legal advice.

A real-world tangle

An owner in the Sacramento area described buying a house with recently completed work that the contractor would not fix under its 'warranty'. They filed a CSLB complaint, but said the investigator told them that because they did not hold the contract, CSLB might not be able to help, and encouraged a claim against the contractor's bond instead. Another commenter summed up an owner's practical options as reviews, a bond claim, a state complaint and small claims. This is one anecdotal account, not a statement of CSLB policy. It shows why it helps to understand how the routes differ before you start.

The routes side by side

Filing a CSLB complaint

CSLB accepts complaints from homeowners, other contractors, subcontractors, employees and public agencies, against both licensed and unlicensed contractors. Complaints involving threats to public health and safety get the highest priority (CSLB, how the complaint process works). You can file online, by mail, or by calling 800-321-CSLB to request a form. Include copies, not originals, of the contract, change orders, cancelled checks and other records.

For licensed contractors, CSLB describes these stages in its complaint process:

1. Intake: CSLB says its intake and mediation center sends letters to both parties, typically within 2–3 weeks, urging the contractor to resolve the matter.
2. Mediation: staff may request documents and try to resolve the dispute.
3. Arbitration: CSLB runs mandatory arbitration for qualifying disputes of $25,000 or less and voluntary arbitration for $25,000–$50,000.
4. Investigation: serious matters go to investigators, who look for clear and convincing evidence of a violation.
5. Outcome: possible citation, accusation or other discipline. For smaller claims without repeated violations, CSLB may direct you to small claims or the bond.

What makes a complaint useful

• A short timeline with dates: signing, payments, work stages, last contact
• The specific problem: for example, abandonment, defective work, payments taken ahead of work, a missing permit
• Evidence: photos, inspection reports, an independent contractor's written assessment and repair estimate
• What you want: completion, correction or reimbursement

Making a bond claim

Every active license must carry a $25,000 bond (effective 1 January 2023). CSLB's bond guide lists who may claim: homeowners who contracted for home improvements or construction of a single-family dwelling and were damaged by the licensee's violation of the license law; anyone damaged by a willful and deliberate violation or by fraud in performing a construction contract; and other eligible claimants under the governing law. It also notes the bond amount is not per job.

1. Find the surety. Open the contractor's license detail on the CSLB lookup and use the 'Contractor's Bond History' link to identify the bond history for the relevant contract and alleged violation dates (CSLB bond basics).
2. Write to the surety with a detailed description of the problem, a copy of the contract, and supporting documents, as CSLB's guide recommends.
3. Respond to the surety's investigation. The surety and CSLB investigate independently.
4. Watch time frames. CSLB says claims must be filed within specified time frames. Ask the surety in writing what applies and act promptly.

If the contractor posted a cash deposit instead of a surety bond, CSLB says a court order is needed to reach those funds.

Choosing a route

Mistakes to avoid

• Expecting CSLB to collect money for you. It may help, but restitution is not guaranteed.
• Waiting. CSLB's jurisdiction is generally four years from the violation, and up to 10 years only for some hidden structural defects (CSLB, after you file). Bond time frames and court deadlines are separate and keep running. Filing a CSLB complaint does not automatically preserve your other claims, and none of these windows is a warranty on the work.
• Sending originals. Send copies, and keep a complete set.
• Skipping the independent assessment. A written report and estimate from another licensed contractor makes both complaints and claims more concrete.
• Overstating the case. Stick to dated facts. Allegations of fraud need evidence of intent. A payment-rule violation is a serious issue on its own and does not need to be labelled fraud.

Bay Area applicability

CSLB and bond rules are statewide. For complaints filed by mail, CSLB routes work performed in most Northern California counties, including the Bay Area, to its Sacramento intake center, and work in several Southern California counties to Norwalk (see CSLB's filing page). Small claims cases are filed in the superior court of the relevant county, for example San Francisco or Contra Costa.

Current to 3 October 2026.