Moving or adding bathroom fixtures Where the drain can go
Moving a toilet, shower or sink, or adding a whole bathroom, means new drain, vent and supply lines, and often new wiring and framing. It is one of the bigger bathroom projects. What matters most is whether a drain can reach the main stack with enough slope and proper venting from the spot you want. Call 804-566-7669.
How it works
- Call 804-566-7669Your call connects to an independent contractor in your area.
- Talk it throughSay what you want done, the age of the house and when you hope to start.
- Get it in writingScope, schedule and price on paper before any work starts. Then you decide.
1What moving or adding bathroom fixtures involves
Drains run on gravity, so every new fixture needs a pipe that slopes downhill to the main drain, commonly about a quarter inch per foot. The farther a fixture moves from the main stack, the more drop the pipe needs and the more floor or ceiling depth it uses. Toilets need larger drains than sinks or showers and are the hardest to move. Each fixture also needs venting so it drains smoothly and the trap holds water, which may mean a new vent through the roof or tying into an existing one.
In a wood-framed house, new drain lines usually run between floor joists or through them within strict limits on hole size and placement. Running across joists can require reframing. On a slab, the floor is cut and trenched to place new drain lines, then patched. Basements without a drain low enough may use an ejector pump system or an upflush toilet; whether those are allowed and how they are installed depends on local code. The plumbing guide covers more on drains and vents.
A new bathroom also needs a supply line, enough hot water capacity, a vented exhaust fan, lighting and outlets, which in most places include GFCI protection and often a dedicated circuit. If your home is on a septic system, adding a bathroom may trigger a review of the system’s capacity. Framing new walls, adding a door and soundproofing round out the work. Once rough-in passes inspection, the room is finished like any other bathroom, including tile and waterproofing.
How the work usually goes
- Plan the layout and drain pathThe contractor maps how drains, vents and supplies can reach the new locations and whether framing or a slab needs to change.
- Permit and designDrawings and a permit application are usually prepared, sometimes with engineering if joists or walls are affected.
- Demolition and framingFloors, walls or slab are opened, and any new walls, blocking and joist reinforcement are built.
- Rough-in plumbing and electricalDrain, vent and supply lines are run, wiring, fan duct and circuits installed, and rough-in inspections scheduled.
- Close up and waterproofAfter inspection, walls and floors are closed, and the shower and wet areas are waterproofed.
- Finish and final inspectionTile, fixtures, trim and accessories go in, followed by testing and a final inspection where required.
2What decides it
Want to move fixtures or add a bathroom?
3Common mistakes
- Picking a location before checking the drain pathA spot far from the main stack may need reframing or a pump. Have the drain route checked before you finalize the layout.
- Cutting joists for drain linesLarge notches or holes in the wrong place weaken floors. Use code-allowed hole sizes and locations, or reframe with guidance from an engineer.
- Forgetting ventingA drain without proper venting can gurgle, drain slowly or let sewer gas in. Plan vents along with drains from the start.
- Overlooking hot water and septic capacityA new bathroom adds demand. Check whether your water heater and, if you have one, your septic system can handle it.
4When to call a pro
Want to move fixtures or add a bathroom?
Talk to a local contractor about it today.
5Questions
What happens when I call?
Your call to 804-566-7669 connects to an independent local contractor. Describe the project, ask your questions, and decide whether you want a quote. Calling does not commit you to anything. iLikeToFix earns a referral fee when a call connects; here is how that works.
How hard is it to move a toilet?
It depends on the floor and the distance. A toilet needs a larger drain than other fixtures, and moving it a short distance along the joists may be simple. Moving it across joists or far from the stack can mean reframing. On a slab, the concrete has to be cut. A contractor can usually tell you how involved it is after checking what is below the floor.
Can I add a bathroom in a basement without a floor drain?
Often yes, if the main drain is below the basement floor you can tie into it by cutting the slab. If the main drain is above the floor, an ejector pump or an upflush toilet system can pump waste up to it. Whether those systems are allowed and how they must be installed depends on local code, so check before planning.
Does adding a bathroom require a permit?
In almost every area, yes. New plumbing, electrical circuits and walls typically need a permit and inspections at rough-in and final stages. Skipping permits can cause problems with insurance claims and when you sell. Your local building department can explain the process, and many contractors handle it.
Will adding a bathroom affect my septic system?
It can. Septic systems are usually sized by the number of bedrooms or expected use, and some areas require a review or upgrade when you add a bathroom or bedroom. Contact your local health or building department to learn what applies, especially if your system is old or near capacity.
Related bathroom jobs
Moving or adding bathroom fixtures start with one call
Talk to a local contractor. Calling does not commit you to anything.