Why basement bathrooms cost more
Below-grade drainage may require slab cutting or a sewage ejector. Vent routing, waterproof shower construction, ventilation, and limited access can also raise labor costs.
Budget = area × quality rate + plumbing allowance + selected upgrades
FAQ
Can a basement toilet drain by gravity?
Sometimes. A plumber must confirm that the building drain is low enough and properly located. Otherwise an ejector system may be necessary.
Does the estimate include permits?
Yes, as a broad allowance. Actual permit and inspection fees vary.