Accessible Shower Compartment Types (2010 ADA Standards 608.2)
Three types, three geometries, and picking the wrong one puts a remodel a foot short in the wrong direction.
Example
You enter
- Shower type standard-roll-in
- Clear inside width (in) 32
- Clear inside depth (in) 60
- Entry width (in) 32
- Clearance outside the compartment, width (in; 0 = skip) 30
- Clearance outside the compartment, length (in; 0 = skip) 60
You get
- Required width (in) 30
- Required entry (in) 60
- Entry deficit (in) 28
- Inside area (ft²) 12.5
- Total footprint (ft²) 25
Checked against published worked examples from: US Department of Justice / US Access Board.
Details, formula, and sources
ScopeTRANSFER is 36 x 36 in -- the only one that fits a standard alcove -- but its OUTSIDE clearance is 36 x 48 from the control wall, deeper than the stall itself. STANDARD ROLL-IN is 30 x 60 with a 60 in entry, meaning the whole long side is open, which a curb or jamb defeats. ALTERNATE ROLL-IN is 36 x 60 with a 36 in entry on one long side. It also reports which types a compartment WOULD satisfy as built, because a stall that fails one often meets another.
Formula or tabletransfer type: 36 x 36 in clear inside, 36 in wide entry, 36 x 48 in clearance from the control wall. Standard roll-in: 30 in wide by 60 in deep clear inside, 60 in wide entry, 30 x 60 in clearance adjacent to the open face. Alternate roll-in: 36 in wide by 60 in deep clear inside, 36 in wide entry at one end of the long side.
Source and edition2010 ADA Standards for Accessible Design, 608.2.1, 608.2.2, and 608.2.3. 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 namesshower_type, width_in, depth_in, entry_width_in, clearance_width_in, clearance_length_in, required_width_in, required_entry_in, entry_deficit_in, inside_area_sf, total_footprint_sf
- Transfer type 36 x 36 in inside, 36 in entry, 36 x 48 in clearance from the control wall2010 ADA Standards 608.2.1
- Standard roll-in 30 x 60 in inside, 60 in entry, 30 x 60 in clearance at the open face2010 ADA Standards 608.2.2
- Alternate roll-in 36 x 60 in inside, 36 in entry at one end of the long side2010 ADA Standards 608.2.3
- Inside dimensions measured at the center points of opposing sides2010 ADA Standards 608.2
- What it would satisfy reported in either orientation, as information rather than a verdictroughlogic addition, stated