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Adding a bathroom by converting existing floor space starts around $3,000-$6,000 (depending on easy access, size and quality of fixtures and other amenities) but can run $7,000-$25,000 or more for spa-like master baths or projects with poor access to existing utilities or requiring foundation reinforcement.
1. Edit Answer (for another 5 minutes). Nationwide average code to modify a house to add a bathroom (without pushing out walls or adding foundation) is about $37,000. Some are done on the cheap for about $15,000 for a half-bath, and fancy ones of course for 5/4 bath or fancier can run $50-80,000. Obviously, if you can back it up to another bath for easy in-wall pipe access that will help keep your costs down.