GOV § 51183

(a) The local agency may exempt from the standards set forth in Section 51182 structures with exteriors constructed entirely of nonflammable materials, or conditioned upon the contents and composition of the structure, and may vary the requirements respecting the management of fuels surrounding the structures in those cases. This subdivision does not authorize a local agency to vary a requirement that is a building standard subject to Section 18930 of the Health and Safety Code, except as otherwise authorized by law.

(b) An exemption or variance under subdivision (a) shall not apply unless and until the occupant of the structure, or if there is no occupant, then the owner of the structure, files with the local agency a written consent to the inspection of the interior and contents of the structure to ascertain whether Section 51182 is complied with at all times.