Small bathroom fixtures will visually open up the space and are a popular solution being adopted by many professional designers. Moreover, storage space in modern bathrooms can be carved out in the studs of the wall above both the toilet and the sink. The best way to arrange 5x8 small bathroom design is to center the door along the long wall. To allow the door to open, the sink or bathroom vanity cannot extend more than 18 inches from the wall. In this layout, the tub fits into one end of the room.