2019 California Standards for Accessible Design Guide (effective January 1, 2020 with July 1, 2021 amendments)
11B-404.2.11 Vision lights.
Doors, gates, and side lights adjacent to doors or gates, containing one or more glazing panels that permit viewing through the panels shall have the bottom of at least one glazed panel located 43 inches (1092 mm) maximum above the finish floor.
Exception: Glazing panels with the lowest part more than 66 inches (1676 mm) from the finish floor or ground shall not be required to comply with Section 11B-404.2.11.
ETA Editor's Note
The vision light requirement of CBC 11B-404.2.11 is derived from the 2010 ADA Standards 404.2.11. Under ADA, an existing door with a noncompliant vision light is a Safe Harbored element for path of travel and barrier removal purposes but will have to comply when the door is replaced, and may not be relocated elsewhere on an accessible route. Under CBC, an existing primary entrance door with a noncompliant vision light is not Safe Harbored, unless the Exception at 11B-404.2.11 applies, and must be mitigated under path of travel obligations.
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