Employ your helper to hold the fixture at an estimated height and then see if it s a comfortable reach for all users.
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.
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.
For shower only controls between 36 and 48 inches from the floor is common.
Showers set in bathtubs require lower valve heights because the valve must connect to both the shower and the bath tap.
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.
About 33 inches from the floor.
Subtract the thickness of your finished wall from the depth distance to find the pipe depth.
A height of 28 inches or 2 feet 4 inches is standard for valves in bathtub shower units.
A stand alone shower you can raise it up to about 42 inches from the floor.
Shower controls should be placed at a height 40 50 102 127 cm above the shower floor and out of direct line of the water path to avoid being caught in extremely cold or hot water when operating.
The valve height depends on if it is a tub and shower combo or just a shower.