Notwithstanding Sections 17922, 17958, and 17958.5, a city or county may, by ordinance, permit efficiency units for occupancy by no more than two persons which have a minimum floor area of 150 square feet and which may also have partial kitchen or bathroom facilities, as specified by the ordinance. In all other respects, these efficiency units shall conform to minimum standards for those occupancies otherwise made applicable pursuant to this part.
“Efficiency unit,” as used in this section, has the same meaning specified in the Uniform Building Code of the International Conference of Building Officials, as incorporated by reference in Chapter 2-12 of Part 2 of Title 24 of the California Code of Regulations.
Source:
Section 17958.1, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=HSC§ionNum=17958.1..