Cal. Gov. Code § 65852.5

Notwithstanding the provisions of Section 65852.3, no city, including a charter city, county, or city and county, may impose size requirements for a roof overhang of a manufactured home subject to the provisions of Section 65852. 3, unless the same size requirements also would be imposed on a conventional single-family residential dwelling constructed on the same lot. However, when there are no size requirements for roof overhangs for both manufactured homes and conventional single-family residential dwellings, a city, including a charter city, county, city and county, may impose a roof overhang on manufactured homes not to exceed 16 inches.