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

Note: This document or portion of document references a state or local requirement that is NOT required by the 2010 ADA Standards.

1132A.4.1 Thresholds.

Thresholds at the primary entry and required exit doors shall be no higher than ½ inch (12.7 mm). Thresholds at secondary exterior doors, including sliding door tracks, shall be no higher than 3/4 inch (19.05 mm). Changes in height at interior door thresholds (e.g., floor material changes at door thresholds) shall not exceed ½ inch (12.7 mm). Thresholds shall comply with the following:

  1. Thresholds with a change in height of not more than ¼ inch (6.35 mm) may be vertical. 

  2. Thresholds with a change in height between ¼ inch (6.35 mm) and 3/4 inch (19.05 mm) shall be beveled with a slope no greater than 1 unit vertical in 2 units horizontal (50-percent slope).

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