What is a contractors license?

A contractors license is given to Contractors by the CSLB.

the Contractors State License Board (CSLB) protects consumers by licensing and regulating California's construction industry. There are more than 310,000 licensed contractors in the state, in 43 different licensing classifications. In addition to educating consumers about contractors and construction law, CSLB activities include administering examinations to test prospective licensees, issuing licenses, investigating complaints against licensed and unlicensed contractors, issuing citations, suspending or revoking licenses, and seeking administrative, criminal, and civil sanctions against violators.