2019 California Standards for Accessible Design Guide (effective January 1, 2020 with July 1, 2021 amendments)

1.1.7.3.1 Detached one- and two-family dwellings.

Detached one- and two-family dwellings, lodging houses, live/work units, townhouses not more than three stories above grade plane in height with a separate means of egress, and their accessory structures, may be designed and constructed in accordance with this code or the California Residential Code, but not both, unless the proposed structure(s) or element(s) exceed the design limitations established in the California Residential Code, and the code user is specifically directed by the California Residential Code to use this code.