In general, all persons or businesses constructing or altering, moving, wrecking, or demolishing any building, highway, road, parking facility, railroad, excavation or other structure, project, development or improvement must be licensed as a contractor if the total cost of labor and materials for a project is $500 or more. A license is also needed to do any work as a subcontractor or specialty contractor, and persons engaged in the business of home improvement.
Department of Consumer Affairs
Contractors State License Board
9821 Business Park Drive
Sacramento, CA, 95827