dimensions of a standard tub shower
Quick Answer. A standard one-piece shower and tub combination unit is purchased with rough-in dimensions of 60 inches wide, 31 inches deep and 73 3/4 inches high before installation. After the unit is installed, the finished unit is still 60 inches wide, but the measurable depth is 29 3/4 inches deep and the overall visible height is 72 1/2 inches. Keep Learning.