How to File a CSLB Complaint Against a Contractor
When a licensed contractor abandons a job, performs defective work, or violates the terms of a contract, California homeowners can file a formal complaint with the Contractors State License Board (CSLB). The CSLB investigates complaints, mediates disputes, and has the authority to discipline or suspend a contractor’s license.
This guide covers when the CSLB can help, what to document before filing, how the complaint process works, and what to do if the CSLB process does not resolve your dispute.
When the CSLB Can Help
CSLB reviews licensing-law complaints involving licensed and unlicensed contractors. Examples include defective work, abandonment, contract violations and lack of reasonable diligence. Do not assume a scheduling or payment dispute is automatically outside its jurisdiction: describe the conduct and let CSLB assess it.
The usual jurisdiction period is up to four years from the suspected act or omission, not simply when you discover the problem. Some hidden structural defects may fall within a longer period of up to ten years. Contact CSLB promptly to check your circumstances. Court and bond-claim deadlines are separate; do not assume a CSLB complaint pauses them.
Sources: CSLB complaint guidance and jurisdiction and hidden structural defects.
What to Document Before Filing
A strong complaint starts with documentation. Before filing, gather the following:
- The signed contract, including any change orders.
- All payment records: checks, credit card statements, receipts, Venmo or Zelle confirmations.
- Written communications: texts, emails, letters.
- Photos of defective or incomplete work, dated if possible.
- Any inspection reports, permits, or building department correspondence.
- The contractor’s license number, business name, and any business cards or advertisements.
If you do not have the contractor’s license number, you can look it up before filing.
Verify a Contractor's License Now
How to File a CSLB Complaint
The CSLB accepts complaints through its online complaint form. You can also request a paper form by calling 800-321-CSLB (2752). There is no fee to file.
The form asks for the contractor’s information, a description of the problem, the amount of financial loss, and supporting documents. Be specific and factual. State what was agreed to, what was delivered, and how much money is at stake. Avoid emotional language. The investigator reading your complaint needs facts, not opinions.
What Happens After You File
CSLB reviews written complaints for jurisdiction and may seek a voluntary resolution, offer mediation or investigate. Referral depends on the facts, seriousness and available resources; every complaint does not receive a site investigation. A complaint does not guarantee repayment.
Arbitration Programs
- Mandatory program: alleged damages of $25,000 or less.
- Voluntary program: alleged damages above $25,000 and up to $50,000.
CSLB decides eligibility; the amount alone does not qualify a dispute. Read the participation agreement before accepting arbitration, including its effect on court remedies and bond recovery. Do not assume every smaller claim automatically goes to arbitration.
See the current CSLB complaint process and mandatory arbitration guide.
Set Realistic Expectations
Licensing discipline and compensation are different outcomes. Keep a separate record of your financial loss and ask about the appropriate recovery process; an enforcement decision is not a promise that your costs will be reimbursed.
Filing a Bond Claim
If a licensed contractor has caused you financial harm, you may be able to file a claim against the contractor’s $25,000 license bond. This is a separate process from the CSLB complaint.
The bond is held by a surety company, not by the CSLB. To file a claim, you need to identify the surety company and bond in effect for the relevant period using the contractor’s CSLB bond history, then contact the surety directly with your claim and supporting documentation. The surety investigates the claim and decides whether to pay.
The current standard license bond is $25,000, with limits shared across claims; it is not $25,000 of guaranteed compensation for each homeowner. If multiple eligible claimants file claims against the same bond, the available funds may be divided. For more on how bonds work, see our bond and insurance guide.
Verify a Contractor's License Now
Small Claims and Other Court Options
Check the California Courts small claims guide for eligibility, current limits, fees and filing steps. A local small claims adviser can help you identify the correct defendant and paperwork. Larger claims may require a different court process.
Tell your adviser about any pending CSLB complaint, arbitration agreement or bond claim. These processes can interact; do not assume you can recover the same loss twice or that one filing protects every deadline.
Unpaid Construction Judgments
A qualifying unsatisfied construction-related judgment can lead to license suspension. Follow CSLB's civil judgment instructions and provide the required documents. Suspension is not automatic collection of your money, and statutory requirements and exceptions apply.
Complaints Against Unlicensed Contractors
The CSLB also accepts complaints against unlicensed individuals performing work that requires a license. The CSLB can issue stop-work orders and refer cases for criminal prosecution. However, there is no bond to claim against an unlicensed contractor, and collecting a judgment is often difficult. For more on this situation, see our guide on what to do if your contractor is unlicensed.
Your Next Steps
- Write a dated timeline of the agreement, payments, work and problem.
- Save copies of documents and photographs; keep your originals.
- Contact CSLB promptly about jurisdiction and filing.
- Check separate court and bond deadlines with the appropriate adviser.
Use our license verification guide to find current status and bond history. An inactive license or missing entry in this site's archive is not a reason to skip contacting CSLB.
Updated September 19, 2026. Reviewed jurisdiction, arbitration thresholds and the distinction between enforcement and financial recovery.