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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.
Create falling waters. In most basement bathrooms, you must create âfall,â or you must give the waste a push. All this pushing and falling costs money: Adding a basement bathroom could add $10,000 to your basement retreat budget. Wastewater from your basement bathroom sink, shower or tub, and toilet must have enough slope (another word for âfallâ) to drain properly and effectively.