Altough the design and layout of bathrooms we use nowadays date back millenia, they are still considered as one of the most difficult to design and renovate. During the earliest stages of planning a bathroom, ther are plenty of rules of thumb to follow, esopecially since it involves a lot of association and "pre-planning" with plumbing, electrical circuits, angular or uniquely-shaped fittings, and small floor areas. We will explore the basics of bathroom plumbing and whre to allocate each fixture.