Cal. Health and Safety Code - HSC § 18620. Section 18620.
The department shall adopt regulations regarding the construction of buildings in parks that it determines are reasonably necessary for the protection of life and property and to carry out the purposes of this part. The department shall propose and submit building standards for approval pursuant to Chapter 4 (commencing with Section 18935) of Part 2.5 for the purposes described in this section. The building standards published in the California Building Standards Code and the other regulations adopted by the department shall apply to the construction of all permanent buildings in a park, except in a park in a city, county, or city and county that has adopted and is enforcing a building code with amendments adopted pursuant to Section 17958.5 and which city, county, or city and county is the enforcement agency.