How do I check if a contractor has an active and valid license through the State of California?

The California State Licensed Board (CSLB) provides information about a contractor’s license, bond and workers’ compensation insurance status, as well as pending and prior legal actions. Free consumer publications and complaint forms are also available from the CSLB. For more information go to the CSLB website, call 1-800-321-CSLB (2752), or write to:
CSLB
P.O. Box 2600
Sacramento, CA 95826

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1. Are contractors required to be licensed, bonded, and carry worker’s compensation insurance?
2. How do I check if a contractor has an active and valid license through the State of California?
3. Are there any guides or pamphlets for consumers regarding hiring contractors and home improvement projects?
4. If a building permit is required for my project, is it required that a licensed contractor obtain the permit?
5. Where do I file a construction complaint?
6. Where do I file a construction complaint?