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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.
(40sqft). Cost on adding a bathroom depends if you have an existing room or if you will be adding a new roof to cover the new room. The latter is the most expensive as you will have framing costs (and permits and blueprints,etc) and could cost $10-$15k.an anyone give me a cost estimate to add a bathroom and 250-300 sq ft addition... I'm looking for a general cost to add a bathroom and about 250-300 sq ft. The bathroom would be a 3 piece-toilet, stand up shower (tiled w/glass doors) and double vanity.