Bathroom plumbing diagrams are graphical representations of the location, measurements and routing of water supply pipes, plumbing fixtures, drainage pipes and plumbing ventilation. Many state and municipal building codes require submission of plumbing diagrams for any residential or commercial plumbing construction work that requires a building permit.
When creating a bathroom plumbing diagram, builders must consider several factors regarding the building's construction and the local code requirements. Piping and ventilation runs should reside inside wet walls designed to fit plumbing. Most building codes have specific requirements for the type of material that can be used for pipes as well as size requirements depending on their function.