Diagram/Tim CarterThis rough-in plumbing diagram shows exactly what the drain and vent pipes will look like once installed. Q. My city allows homeowners to install their own plumbing. But to get ...

We’ll walk you through the bathroom plumbing diagram below and how to install a basic 5×8-foot bathroom—just enough room for the three major fixtures with adequate space between them.

QDEAR TIM: My city allows homeowners to install their own plumbing. To get the permit, I need to supply a rough-in plumbing diagram. What is a plumbing diagram?