CSLB
The Contractors State License Board (CSLB) is the California state agency responsible for licensing, regulating, and disciplining contractors. It oversees approximately 300,000 active contractor licenses — the largest contractor licensing database in the United States.
- Class A — General Engineering
- Class B — General Building
- Class C — Specialty contractors (50+ subcategories)
CSLB provides a public license lookup tool and maintains records of disciplinary actions, citations, and license status changes.
Frequently Asked Questions
- How do I file a complaint with CSLB?
- Online at cslb.ca.gov or by calling 1-800-321-CSLB (2752). See our dispute guide for details.
- Is a CSLB license required for all construction work in California?
- Projects over $500 in combined labor and materials require a licensed contractor. Below that threshold, licensing is not required but recommended.
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