Shower Valve Distance From Floor

A stand alone shower you can raise it up to about 42 inches from the floor.
Shower valve distance from floor. This is shown as the distance from the finished wall surface to the center of the riser pipe the pipe that goes from the shower valve up to the shower head. About 33 inches from the floor. The lower crosspiece which will hold the shower valve may be around 50 inches from the floor for a shower enclosure and lower for a bathtub just enough to clear the lip of the tub by a few. The valve height depends on if it is a tub and shower combo or just a shower.
The height of the valve for a shower depends upon whether you need it for a shower stall or a shower set in a bathtub. For shower only controls between 36 and 48 inches from the floor is common. For a tub you would want it low enough to reach without standing up but still high enough to reach without bending over when taking a shower. A height of 28 inches or 2 feet 4 inches is standard for valves in bathtub shower units.
Subtract the thickness of your finished wall from the depth distance to find the pipe depth. Employ your helper to hold the fixture at an estimated height and then see if it s a comfortable reach for all users. Look at the shower valve installation instruction sheet for the depth distance.