2022 California Standards for Accessible Design Guide (effective January 1, 2023)
11B-610.3.1 Rectangular seats.
The rear edge of a rectangular seat shall be 2½ inches (64 mm) maximum and the front edge 15 inches (381 mm) minimum and 16 inches (406 mm) maximum from the seat wall. The side edge of the seat shall be 1½ inches (38 mm) maximum from the adjacent wall.
FIGURE 11B-610.3.1 RECTANGULAR SHOWER SEAT
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