11B-303 Changes in Level — 2025 California Building Code
California Building Code (Title 24, Part 2) · 2025 edition · updated 2026-10-19 · California
CBSC: official editions, supplements and errata
Italicized text is a California amendment to the model code, as printed in the official publication.
Cite as: 2025 California Building Code (Title 24, Part 2) § 11B-303 · Effective January 1, 2026 · Official source: Building Standards Commission
11B- 303.1 General. Where changes in level are permitted in floor or ground surfaces, they shall comply with Section 11B- 303 .
Exceptions:
Animal containment areas shall not be required to comply with Section 11B- 303.
Areas of sport activity shall not be required to comply with Section 11B- 303 .
11B- 303.2 Vertical. Changes in level of 1/4 inch (6.4 mm) high maximum shall be permitted to be vertical and without edge treatment.
FIGURE 11B- 303.2—VERTICAL CHANGE IN LEVEL
11B- 303.3 Beveled. Changes in level between 1/4 inch (6.4 mm) high minimum and 1/2 inch ( 12.7 mm) high maximum shall be beveled with a slope not steeper than 1:2.
FIGURE 11B- 303.3—BEVELED CHANGE IN LEVEL
11B- 303.4 Ramps. Changes in level greater than 1/2 inch ( 12.7 mm) high shall be ramped, and shall comply with Section 11B- 405 or 11B- 406 .
11B-303.5 Warning curbs. Abrupt changes in level exceeding 4 inches (102 mm) in a vertical dimension between walks, sidewalks or other pedestrian ways and adjacent surfaces or features shall be identified by warning curbs at least 6 inches (152 mm) in height above the walk or sidewalk surface.
Exceptions:
1. A warning curb is not required between a walk or sidewalk and an adjacent street or driveway. 2. A warning curb is not required when a guard or handrail is provided with a guide rail centered 2 inches (51 mm) minimum and 4 inches (102 mm) maximum above the surface of the walk or sidewalk.
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