How do I verify a contractor's license in California?

Use the CSLB "Check a License" tool at cslb.ca.gov — enter the contractor's license number or business name to see active status, classification, bond, workers' comp, and any complaint or disciplinary history.

Always verify the license number on the contract matches the name and address on the CSLB record. An "active" status with no disclosures and a current bond is the minimum bar. Any "suspended" or "revoked" history is a hard stop.