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

101.2 Scope.

The provisions of this code shall apply to the construction, alteration, relocation, enlargement, replacement, repair, equipment, use and occupancy, location, maintenance, removal and demolition of every building or structure or any appurtenances connected or attached to such buildings or structures.

Exception:  Detached one- and two-family dwellings and townhouses not more than three stories above grade plane in height with a separate means of egress, and their accessory structures not more than three stories above grade plane in height, shall comply with this code or the California Residential Code.

101.2.1 Appendices.

Provisions in the appendices shall not apply unless specifically adopted.