Cal. Educ. Code § 17353

All plans, specifications and estimates shall be prepared by a certified architect holding a valid license under Chapter 3 (commencing with Section 5500) of Division 3 of the Business and Professions Code or by a structural engineer holding a valid certificate to use the title structural engineer under Chapter 7 (commencing with Section 6700) of Division 3 of the Business and Professions Code, and the supervision of the work of construction in the factory shall be under the responsible charge of such an architect or structural engineer.