(a) Except as otherwise explicitly provided in sections 18865(g), 18865.4, and 18865.5(b), Health and Safety Code, the provisions of this chapter shall apply to the construction, use, maintenance and occupancy of special occupancy park lots, including separate designated sections within mobilehome parks, permanent buildings, accessory buildings or structures, and building components wherever located, both within and outside of special occupancy parks, in all parts of the state. These provisions shall also apply to the use, maintenance and occupancy of recreational vehicles and the installations for supplying fuel gas, water, electricity and the disposal of sewage from accessory buildings or structures, building components, and recreational vehicles, wherever located within special occupancy parks in all parts of the state.

(b) Provisions that apply to mobilehome parks are located in Title 25, California Code of Regulations, Division 1 chapter 2 of this division.

(c) Mobilehomes or manufactured homes, and their accessory buildings or structures, located in special occupancy parks in accordance with section 2118, shall comply with the requirements contained in chapter 2.

(d) Existing construction, connections, and installations of units, accessory buildings and structures, building components, plumbing, electrical, fuel gas, fire protection, earthquake resistant bracing, and permanent buildings made before the effective date of the requirements of this chapter may continue in use so long as they were in compliance with requirements in effect at the date of their installation and are not found to be substandard.