Successful bathroom design requires working with the constraints of the space you have to make important decisions about how the room functions and flows. This means thinking about things like how best to design the shower for maximum comfort and efficiency. Where to place the bathtub if you have the space and desire for one. What size and type of vanity you can fit into your particular bathroom How to work around existing window placement to maximize air flow and natural light. What kind of door works best for privacy and ease of use, or, in the case of a primary suite, whether to install a door at all.