http://www.cslb.ca.gov
http://www.cslb.ca.gov/Consumers/HireAContractor/
In California, anyone who contracts to perform work on a project that is valued at $500 or more for combined labor and materials costs must hold a current, valid license from CSLB. You can verify the license or call (800) 321-CSLB (2752).
ALERT Be advised that unlicensed individuals pose a risk to you and your family’s financial security if a worker is injured while on your property, your property is damaged, or if the work is incomplete and/or faulty. Few, if any, unlicensed individuals have a bond or workers’ compensation insurance. The quality of their work usually doesn’t compare to that of a licensed contractor. Don’t take the chance in order to save a few dollars. You’ll probably end up paying more in the long run.
CSLB licenses contractors in 43 different classifications. This ranges from general contractors to swimming pool contractors, landscapers, painters, electricians, plumbers and many more. It will be easier to decide the right type of contractor if you carefully plan your project in advance and clearly define what you want done to your property.