2022 California Standards for Accessible Design Guide (effective January 1, 2023)

11B-404.2.5 Thresholds.

Thresholds, if provided at doorways, shall be ½ inch (12.7 mm) high maximum. Raised thresholds and changes in level at doorways shall comply with Sections 11B-302 and 11B-303.

Exception: Reserved.

[2010 ADA Standards] EXCEPTION: Existing or altered thresholds ¾ inch (19 mm) high maximum that have a beveled edge on each side with a slope not steeper than 1:2 shall not be required to comply with 404.2.5.