For toilet rooms covered by the ADA scoping provisions, an ambulatory-accessible compartment is required in addition to the wheelchair-accessible compartment when there are six or more toilet compartments, or six or more urinals and water closets combined. Confirm the applicable scope, fixture count and complete layout; it is not a substitute for the wheelchair-accessible compartment.
What triggers the additional compartment?
ADA Section 213.3.1 requires at least one wheelchair-accessible compartment where compartments are provided in a covered toilet room. It adds an ambulatory-accessible compartment when six or more compartments are provided, or when the combination of urinals and water closets totals six or more fixtures. Lavatories are not included in that combination.
For example, four water closets and two urinals reach the combined six-fixture trigger. Counting only the four toilet stalls would miss it. Have the designer apply the scoping provisions to the actual room and project, including any applicable alteration conditions. Our fixture-count guide addresses the separate question of how many plumbing fixtures the occupancy needs.
Why is this not just a second wheelchair stall?
Section 604.8.2 specifies a minimum depth of 60 inches and a width from 35 to 37 inches. Side-wall grab bars are required on both sides. The water closet centerline is 17 to 19 inches from the side wall or partition. The limited width helps place those supports within reach; making the compartment arbitrarily wider does not follow this particular design.
The door, hardware and approach must also comply with the relevant provisions. The door is self-closing, has the required pulls and cannot swing into the minimum compartment area. A suitable toilet or a pair of grab bars alone does not establish a compliant installation.
The required ambulatory compartment is additional to the wheelchair-accessible compartment. Retain the latter's transfer space, door arrangement and other requirements described in the commercial restroom overview.
What should be settled before rough-in?
Ask for a coordinated plan showing the fixture count, each compartment type, partition faces, finished clear dimensions, door approaches and grab-bar backing. Check dispensers and controls against the chosen arrangement before moving piping. Record any permitted alteration exception explicitly rather than assuming existing walls create one.
If work changes an existing restroom, review the alteration and path-of-travel scope separately. A count below six does not eliminate the other accessibility duties that apply to the room.