There is a rebuttable presumption affecting the burden of proof that a worker performing services for which a license is required pursuant to Chapter 9 (commencing with Section 7000) of Division 3 of the Business and Professions Code, or who is performing such services for a person who is required to obtain such a license is an employee rather than an independent contractor. Proof of independent contractor status includes satisfactory proof of these factors:
In addition to the factors contained in subdivisions (a), (b), and (c), any person performing any function or activity for which a license is required pursuant to Chapter 9 (commencing with Section 7000) of Division 3 of the Business and Professions Code shall hold a valid contractors' license as a condition of having independent contractor status.
For purposes of workers' compensation law, this presumption is a supplement to the existing statutory definitions of employee and independent contractor, and is not intended to lessen the coverage of employees under Division 4 and Division 5.
Ca. Lab. Code § 2750.5