Cal. Ed. Code § 17350
It is the intent of this article to provide an alternative procedure to Article 3 (commencing with Section 17280) for the construction and installation of factory-built school buildings not over 1,000 square feet in area designed or intended for use as school buildings. As used in this article, a "factory-built building" means any building designed or intended for use as a school building which is either wholly manufactured or is in substantial part manufactured at an offsite location in accordance with building standards adopted and approved pursuant to Chapter 4 (commencing with Section 18935) of Part 2.5 of Division 13 of the Health and Safety Code and other regulations adopted by the Department of General Services, to be assembled or erected on a schoolsite. Any such building purchased or leased by a school district shall be deemed to be the construction or alteration of a school building as those terms are used in Article 2 (commencing with Section 17260) and Article 3 (commencing with Section 17280) of this chapter, and all of the provisions of each of those articles, not inconsistent with the provisions of this article, shall apply with respect to factory-built buildings designed or intended for use as school buildings.
Ca. Educ. Code § 17350