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

1018.5 Aisles in other than assembly spaces and Groups B and M.

In other than rooms or spaces used for assembly purposes and Group B and M occupancies, the minimum clear aisle capacity shall be determined by Section 1005.1 for the occupant load served, but the width shall be not less than that required for corridors by Section 1020.2.

Exception: Nonpublic aisles serving less than 50 people and not required to be accessible by Chapter 11B (see Section 11B-403) need not exceed 28 inches (711 mm) in width.