How to Build a Bathroom & Toilet in Your Basement


Turning an unfinished basement into usable living space can provide a great deal of additional room at a very affordable price. One element that offers a lot of convenience is a full bath. While this does present some unique obstacles, they can be overcome with proper planning and equipment.

Things You'll Need

  • Up-flush toilet
  • Sink
  • Shower stall (optional)
  • Piping
  • Framing materials
  • Locate the new bathroom directly beneath an existing bathroom, if possible. This will ensure easy access to water lines and drains. This will not only make installation easier and faster, but will help reduce material cost as well. Do not use the same electrical lines as the existing bathroom. You'll want a dedicated circuit for the new bathroom run directly from the breaker box.

  • Frame in the new bathroom using either metal studs or pressure-treated lumber. Before you begin putting in the drywall, install your plumbing as well as your electrical. Use GFCI (Ground Fault Circuit Interruption) devices throughout the bathroom. These devices protect you from fatal shocks in wet environments. Run a cold water line to the shower, sink and toilet locations. You'll need a hot water line to the sink and shower area. Tap into any nearby duct work to provide heat and air to the new room. Once all utilities are in place, install the drywall or other wall covering.

  • Install your up flushing toilet. One of the best is the Sani-Plus from Saniflo. This toilet is equipped with a pump to take away waste water and is very reliable. In addition, the toilet also has inlets for drains from the sink and shower as well. This will allow you to pump out all three items with one device. Once the toilet is set in place, plumb in the water connection, attach the drain, and plug in the unit. Your toilet should now be operational.

  • Install the sink and shower enclosure and attach the plumbing you installed in step 2. Run the drains to the toilet unit and finish framing in the shower enclosure. You are now ready to paint the ceiling and walls. Once the paint dries, install your floor covering and any decorative items such as towel rods or medicine cabinets.

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