A Four-fixture bathroom – a toilet, a bathtub and 2 wash basins (His and Her’s) will be 10’0″ x 7’2″ or 12’2″ x 5’0″.
A Five-fixture bathroom – with a bathtub, 2 toilets and 2 wash basins in separate compartments will be around 16’4″ x 5’0″ or 11’0″ x 8’0″