Cold water only pipe creates one hole between 5 and 10 inches above the floor supply line horizontal.
Standard wall mounted sink height.
For example pedestal sinks are.
For an ada compliant wall hung sink the height has to be somewhere below 34 inches.
Standard sink heights standard bathroom sink heights range from 29 inches to as much as 36 inches high depending upon personal preference and the type of sink.
Even a wall hung sink can be mounted at a height between 30 inches to 36 inches.
Modern bathroom cabinets are 32 to 36 inches high including the countertop.
A wall mounted bathroom sink would normally be mounted at the same height as a sink in a counter in the room.
It basically depends on your needs and preference.
Toilet rough in details.
Check toilet to confirm location water supply connection.
A sink at 30 inches is fairly standard but if your family is tall you can go to 36 inch and above in my market called a luxury height.
Ideally 8 1 4 inches above the floor.
On the contrary 36 inches is a much more comfortable experience for a tall person.
A sink installed at the height of the toilet is incorrectly installed but toilets are in the 16 20 inch range.
Measured from centerline running vertically through the center of the toilet supply line hole should be 6 inches to the side of centerline.