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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.
Cost. In late 2009, converting existing floor space in an area such as a garage, basement or attic to include a bathroom cost between $3,000 and $6,000. Depending on the extravagance of the bathroom and its distance away from plumbing lines, it could cost between $7,000 and $25,000 or more.hose concerned with the cost of adding a bathroom to a home should note that such cost varies, and there are typically satisfactory projects for almost any budget. (Jupiterimages/Creatas/Getty Images). Types. There are two main types of bathrooms that can be added to a home: a full bath and a half-bath.