What to expect from a bathroom remodel plumbing project
From rough-in to finish work, here is how bathroom plumbing works during a remodel and what your contractor needs from you.
A bathroom remodel involves more plumbing than most homeowners expect. Whether you are updating fixtures or gutting the room to the studs, understanding the plumbing process helps you plan and budget correctly.
Phase 1: Rough-in plumbing
Rough-in is the stage where all the supply lines, drain lines, and vent pipes are installed behind the walls and under the floor. This happens after demolition and before the walls are closed up. If you are moving fixtures — shifting the toilet, relocating the shower, or adding a double vanity — this is when the new plumbing paths are created. Your plumber should coordinate with your general contractor so the layout works for both the plumbing and the finished space.
Phase 2: Shower and tub installation
After rough-in and wall board, the shower base, tub, and drain connections are installed. This includes the shower pan, waterproofing membrane, drain assembly, and any custom bench or niche framing. For a walk-in shower, the floor slope and linear drain need to be set correctly so water flows to the drain, not into the room. This is the most common area where poor plumbing causes long-term problems.
Phase 3: Fixture installation
Once tile and paint are done, the plumber returns for finish work. This includes installing the toilet, faucets, shower valve trim, and drain covers. Every connection is tested for leaks. The thermostatic shower valve is set to the right temperature range. This stage is usually one day of work for a standard bathroom.
Phase 4: Inspection
In Columbus, bathroom plumbing requires a rough-in inspection and a final inspection. The rough-in inspection happens before walls are closed up so the inspector can verify supply lines, drain connections, and venting. The final inspection checks fixture installation and leak testing. Your plumber should schedule and pass both inspections.
Timeline and budget
Plumbing for a standard bathroom remodel takes 3-5 working days spread across the project timeline. Budget $2,500-$4,500 for plumbing on a typical bathroom remodel in Columbus, more if you are relocating fixtures or adding a second sink.
Working with your plumber
Give your plumber the fixture specifications before rough-in so the supply lines and drain positions are correct. Changing fixtures after rough-in means opening walls up again. A good plumber will ask for this information before they start.
Bayshore Plumbing Services
Columbus & Central Ohio
