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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 Home addition cost estimates of $80 to $130 per square foot for a basic family room addition is common. 2  If the home addition includes a bathroom and/or a kitchen, the room addition costs can easily escalate to $200-250 per square foot.  Quality and materials used are the other cost factors in a home addition.