California Code, Health and Safety Code - HSC § 18025

(a) Except as provided in subdivisions (b)and (c), it is unlawful for any person to sell, offer for sale, rent, or lease within this state, any manufactured home or any mobilehome, commercial coach, or special purpose commercial coach manufactured after September 1, 1958, containing structural, fire safety, plumbing, heat-producing, or electrical systems and equipment unless the systems and equipment meet the requirements of the department for those systems and that equipment and the installation of those systems and that equipment.  The department may adopt rules and regulations that are reasonably consistent with recognized and accepted principles for structural, fire safety, plumbing, heat-producing, and electrical systems and equipment and installations, respectively, to protect the health and safety of the people of this state from dangers inherent in the use of substandard and unsafe structural, fire safety, plumbing, heat-producing, and electrical systems, equipment and installations.

(b) All manufactured homes and mobilehomes manufactured on or after June 15, 1976, shall comply with the National Manufactured Housing Construction and Safety Standards Act of 1974 (42 U.S.C. Sec. 5401 et seq.).

(c) The sale of used manufactured homes and mobilehomes by an agent licensed pursuant to this part shall be subject to Section 18046.