2010 ADA Standards for Accessible Design Pocket Guide
303 Changes in Level
303.1 General.
Where changes in level are permitted in floor or ground surfaces, they shall comply with 303.
EXCEPTIONS: 1. Animal containment areas shall not be required to comply with 303.
2. Areas of sport activity shall not be required to comply with 303.
303.2 Vertical.
Changes in level of ¼ inch (6.4 mm) high maximum shall be permitted to be vertical.
Figure 303.2 Vertical Change in Level
303.3 Beveled.
Changes in level between ¼ inch (6.4 mm) high minimum and ½ inch (13 mm) high maximum shall be beveled with a slope not steeper than 1:2.
Advisory 303.3 Beveled. A change in level of ½ inch (13 mm) is permitted to be ¼ inch (6.4 mm) vertical plus ¼ inch (6.4 mm) beveled. However, in no case may the combined change in level exceed ½ inch (13 mm). Changes in level exceeding ½ inch (13 mm) must comply with 405 (Ramps) or 406 (Curb Ramps).
Figure 303.3 Beveled Change in Level
303.4 Ramps.
Changes in level greater than ½ inch (13 mm) high shall be ramped, and shall comply with 405 or 406.
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