How big should a double shower be?

As for the size goes, the most common sizes are 3 feet by 5 feet and 4 feet by 6 feet. There are no minimum requirements. This is what the couple in question feels comfortable as long as the space goes.Two of the most common sizes are 3 feet by 5 feet and 4 feet by 6 feet. Whatever the couple in question feels comfortable with, that's what it is.