Although this 5 x 8 Bathroom Layout appears to be a small size for a bathroom, it is the most common floor plan and can still accommodate a sink, a shower and tub, and a toilet. However, because of the limited 5 x 8 Bathroom Layout space, those designing such a space from scratch may struggle with the layout. A minimum of 40 square feet is required for any bathroom to accommodate all basic amenities. A 58-inch bathroom layout has enough space for all of these amenities, including a sink, a shower, a tub combo, and a toilet.