California Code, Business and Professions Code - BPC § 8803.1

(a) The board shall continue to have full jurisdiction and authority over the licensee as if the license had not expired or become delinquent.

(b) The work performed by the licensee during a period of expiration or delinquency shall be deemed lawful and validly performed as to persons or entities other than the licensee.

(c) The renewal of a license shall not affect liability issues regarding work performed during a period of expiration or delinquency, nor does the fact of performance during a period of expiration or delinquency affect liability issues.