Your plumber deals with all the PVC (plastic), copper, flexible, and cast iron pipes in your house. This includes the water supply, drains, vent stack, sewer connection, hot water radiators, and natural gas. As with all your other contractors, make sure that your plumber has experience working in renovations, particularly if you are pursuing historic tax credits.

It is important to coordinate between the plumbers and carpenters - there may be unique situations where walls, chases, and soffits must be framed to create space for waste stacks, plumbing traps, and vents.

The rough-in stage involves installation of all pipes up to the location they protrude from the wall. Later, after the drywall and cabinets have been installed, the plumber returns to install the fixtures and connect them to the water system. The major exception to this rule is the bathtub/shower. The tub/showers must be installed in their final location before the rough plumbing inspection, which involves filling and draining the tub. You will have to purchase the tub and shower fixtures, shower valves, and drains in order for the plumber to complete the rough-in.