ADA Requirements for Grab Bars In A Shower Stalls.
Figure 37(a) 36 in by 36 inches (915 mm by 915 mm) Transfer Stall. The L-shaped shower seat shall be 18 inches (455 mm) above the floor measured at the entry. An L-shaped grab bar (or two single grab bars with the ends close together) shall be provided, located along the full depth of the control wall (opposite the seat) and halfway (18 inches (455 mm)) along the back wall. The grab bar(s) shall be mounted 33-36 inches (840-915 mm) above the shower floor measured at the entry.
The controls shall be placed in an area between 38-48 inches (965-1220 mm) above the floor. The controls and spray unit shall be within 18 inches (455 mm) of the front of the shower.
Figure 37(b) 30 in by 60 inches (760 mm by 1525 mm) Roll-in Stall. A U-shaped grab bar (or three separate grab bars) shall be provided. The grab bar (or bars) shall be 33-36 inches (840-915 mm) high. The controls shall be placed in an area between 38-48 inches (965 -1220 mm) above the floor. Controls shall be located on the back (long) wall 27 inches (685 mm) from the side wall. The shower head and control area may be located on the back wall or on either side wall.
Grab Bars at Shower Stalls
Sourced from: http://www.ada.gov/reg3a.html – https://ocgrabbars.com/