Accessible Toilet Compartment Sizing (2010 ADA Standards 604.8)
Two compartments can be owed, and the second is triggered by an OR that gets read as an AND.
Example
You enter
- Toilet compartments in the room 4
- Urinals in the room 3
- Water closets in the room 4
- Wheelchair compartment width (in) 60
- Wheelchair compartment depth (in) 56
- Water closet mounting floor-mounted
- Ambulatory compartment provided? no
You get
- Wheelchair compartment 59
- Wheelchair depth deficit (in) 3
- Wheelchair width deficit (in) 0
- Fixture total 7
- Other mounting depth (in) 56
Checked against published worked examples from: US Department of Justice / US Access Board.
Details, formula, and sources
Scopean AMBULATORY compartment is required in addition to the wheelchair one where six or more compartments are provided OR where urinals and water closets total six or more fixtures. Four stalls and three urinals is seven fixtures and owes one, which is the case that gets missed because the stalls get counted and the urinals do not. The wheelchair compartment is 60 in wide and 56 in deep for a WALL HUNG water closet or 59 in for a FLOOR MOUNTED one, so a fixture substitution that moves no partition can fail the stall. And the ambulatory width is a WINDOW, 35 to 37 in: a 40 in stall is too WIDE to qualify, because the point is grab bars on both walls within reach.
Formula or tablewheelchair accessible compartment: width >= 60 in; depth >= 56 in for a wall hung water closet or >= 59 in for a floor mounted one. Ambulatory accessible compartment: depth >= 60 in and 35 in <= width <= 37 in. An ambulatory compartment is required in addition where compartments >= 6 OR (urinals + water closets) >= 6.
Source and edition2010 ADA Standards for Accessible Design, 213.3.1, 604.8.1.1, and 604.8.2.1. A US federal standard in the public domain, quoted directly.
Free accessThe 2010 ADA Standards are published in full at no cost at ada.gov and by the US Access Board.
What governsEstimate. AHJ and licensed professional govern.
API field namescompartment_count, urinal_count, water_closet_count, wheelchair_width_in, wheelchair_depth_in, wc_mounting, ambulatory_provided, required_wheelchair_depth_in, wheelchair_depth_deficit_in, wheelchair_width_deficit_in, fixture_total, other_mounting_depth_in
- Wheelchair compartment width 60 in minimum, measured perpendicular to the side wall2010 ADA Standards 604.8.1.1
- Wheelchair compartment depth 56 in minimum for wall hung, 59 in minimum for floor mounted water closets2010 ADA Standards 604.8.1.1
- Ambulatory compartment 60 in deep minimum, 35 in minimum to 37 in maximum wide2010 ADA Standards 604.8.2.1
- Ambulatory trigger six or more compartments, OR urinals plus water closets totalling six or more2010 ADA Standards 213.3.1
- Ambulatory compartment required in addition to the wheelchair compartment, not as an alternative2010 ADA Standards 213.3.1