how much would it cost to add a bathroom to my house
1 Adding new floor space to your home for a basic 6x8-foot bathroom addition starts around $25,000-$50,000 and goes up depending on complexity, quality of fixtures, number of amenities and local labor rates.ypical costs: 1  Converting existing floor space inside a garage, basement or attic into a simple bathroom starts around $3,000-$6,000. 2  However, costs can be $7,000-$25,000 or more for a more luxurious bathroom, or if the new bathroom is far from existing water and sewer lines.
1 Remodeling Magazine pegs the price of a 6x8-foot bathroom addition at averages of $33,188-$41,195 in the Midwest, $34,876-$42,491 along the East Coast and $35,987-$47,052 in the Western states. 2  For a spa-quality 100-square-foot master bath the survey says it averages $75,812 nationwide.ypical costs: 1  Converting existing floor space inside a garage, basement or attic into a simple bathroom starts around $3,000-$6,000. 2  However, costs can be $7,000-$25,000 or more for a more luxurious bathroom, or if the new bathroom is far from existing water and sewer lines.