According to the 2010 update to adaag the basic ada guidelines for a single user restroom are.
Minimum ada restroom dimensions.
In a corner handicap stalls require a minimum of 60 x 60 compartment and is required with a minimum door size of 32 and the maximum size and more common is the 36 door.
To start with the ada requires a clear floor space of at least 60 inches in diameter for the turning space within a bathroom in addition to the space taken up by the sink toilet and or shower tub.
The ideal ada bathroom dimensions for accessible shower stalls are 915mm x 915mm.
30 inch by 48 inch access to the sink the door can t swing into this rectangle.
Horizontal grab bars must be installed behind the toilet and on the nearest wall or partition whichever is closer.
Ideal ada bathroom guidelines for foldable l shaped shower seat is 585mm long for wide section and 405mm long for narrow section.
Ambulatory compartment stalls are 35 37 width and have a 32 door which is handicap prepped.
Once you get accessible shower stalls for your shower mount them on your shower wall.
The measurement starts from the point where a person has 9 inch vertical clearance for their feet and 27 inch vertical clearance for their knees.
But technically the ada does not have a minimum space requirement for the overall size of an accessible bathroom.
Accessible toilet stalls or compartments must have a minimum width of 60 inches and sufficient space to accommodate a wheelchair to the sides of the toilet or in front of it.