Roll-in shower: 60 × 30 in minimum stall (no threshold > ½ in); seat + grab bars + ≥ 36 in clear floor at side
US Access Board ABA §608 Roll-in showersDescription
Roll-in showers must have at minimum a 60 in × 30 in stall (alternate accessible roll-in is 60 × 36). NO threshold greater than ½ in high (chamfered if greater than ¼ in). A seat must be provided opposite the controls — folding seat or fixed bench. Grab bars on the back wall (entire length above seat) and side wall opposite the controls. A 36 in × 60 in clear floor space must be adjacent to the shower for the user's wheelchair before transfer. Shower controls 38-48 in AFF, offset toward the seat side.
Why this exists
The roll-in shower (also called curbless shower) is the gold standard for accessible bathing — and increasingly popular even in non-accessible primary baths for aesthetic + aging-in-place reasons. Architects should design the curbless detail with a linear drain + sloped floor pan + waterproofing membrane during framing; retrofitting is messy.
Measurements
| Property | Operator | Value | Unit | Note |
|---|---|---|---|---|
stallWidth | min | 60 | in | Shower stall minimum width |
stallDepth | min | 30 | in | Shower stall minimum depth |
thresholdMax | max | 0.5 | in | Maximum threshold height |
adjacentClear | min | 36 | in × 60 in | Adjacent clear floor space |
Categories
Source
Solver enforcement
Browsable only — the solver does not currently enforce this directive (no spec-level data to check against). This entry exists so the architect personas can cite it in conversation and the user can read what the rule says.
Related directives
- Bathroom entry doorway · NKBA Bath 1
- Kitchen walkway and work-aisle widths · NKBA Kitchen 6
- Doorway swing clearance · NKBA Bath 2
- Clear floor space at fixtures · NKBA Bath 3
- Fixture clear-space overlap · NKBA Bath 4
Last reviewed 2026-05-15.