Section 305.1/Clear Floor Space
ADA 2010 Section 305 defines the minimum 30-by-48-inch clear floor space required at accessible elements.
A clear floor space of 30 inches by 48 inches minimum must be provided at every accessible element (controls, fixtures, dispensers, counters). The clear floor space may be positioned for either a forward approach or a parallel (side) approach. The floor within the clear space must be stable, firm, and slip-resistant. The clear floor space may overlap with knee and toe clearance, turning space, and accessible routes.
Why this section exists
The 30-by-48-inch clear floor space represents the footprint of a standard wheelchair plus the space needed for a person to position themselves to use an element. This dimension is the building block of accessibility: it appears in the requirements for every fixture, control, counter, and operable element. Understanding this fundamental dimension is essential for accessible design.
What plan reviewers look for
Plan reviewers verify that a 30-by-48-inch clear space exists at every accessible element shown on the floor plan. They check the approach direction (forward or parallel) and verify that no obstructions (furniture, walls, other fixtures) block the clear space. They also check that the surface within the clear space is level (2% maximum slope in any direction).
Common violations
Related ADA requirements
Section 306 covers knee and toe clearance at elements with a forward approach. Section 308 covers reach ranges from the clear floor space. Section 304 covers turning space. The 30-by-48-inch dimension is referenced in virtually every other section of the ADA standards.