In short, California requires a license for almost any discipline you can think of performing including professional skill sets and cottage-industry crafts that haven't been thought of yet. It's now a requirement of the building inspector to shout in his most sincere basso profundo Austrian accent, "Ahl be bak!" - even if he just complimented you upon a great job and handed you a CO.
You're required to be licensed by the California Contractors State License Board (CSLB) if the total cost of one or more contracts on the project is $300 or more.
To find out if a contractor is licensed in California, click on LICENSING .
Out-of-state corporations must register with the California Secretary of State. For information click on Secretary of State .