California Code, Business and Professions Code - BPC § 7027

Any person who advertises or puts out any sign or card or other device that would indicate to the public that he or she is a contractor, or who causes his or her name or business name to be included in a classified advertisement or directory under a classification for construction or work of improvement covered by this chapter is subject to the provisions of this chapter regardless of whether his or her operations as a builder are otherwise exempted.