California Code, Business and Professions Code - BPC § 18106

(1) If the freelance worker requested a written contact prior to commencing work under the contract and the hiring party refused in violation of Section 18103, the freelance worker shall be awarded an additional one thousand dollars ($1,000).

(2) If the hiring party failed to pay the freelance worker the contracted compensation by the time required under Section 18102, the freelance worker shall be awarded damages up to twice the amount that remained unpaid at the time payment was due.  If the freelance worker requested a written contract prior to commencing work under the contract and the hiring party refused in violation of Section 18103, the amount unpaid shall be determined by the rate the freelance worker reasonably understood to apply to the work.

(3) If the hiring party violates any other provision of this part, the freelance worker may be awarded damages equal to the value of the contract or the work performed, whichever is greater.