Adding a Bathroom – Costs To Consider. Adding a bathroom can cost from $3,000.00 for a simple conversion of existing space to $25,000.00 for a new addition to your house. The national average for a 100-square-foot, spa-like bathroom is over $75,000.00, so watch your budget carefully. 08/06/2018 – The cost of adding a bathroom varies greatly based on your specific project. For example, if plumbing is already in place and you are not moving items around, a very simple bathroom addition can cost as low as $3,000. While doing the math can be a little stressful, there’s great news: adding a bathroom is a high-ROI project, and the cost to add a bathroom isn’t as high as you . 30/10/2018 – Adding a bathroom will cost $3,000 to $25,000. The price depends on whether you build it in an existing space or build a new addition. 28/09/2017 – How much it costs to add a bathroom, bedroom, and beyond . Although small in terms of square footage, bathrooms have a huge price tag, . Those concerned with the cost of adding a bathroom to a home should note that such cost varies, and there are typically satisfactory projects for . Small bathroom . The size of your addition will also play a role in how much the addition costs. How much does it cost to add a bathroom to your Minneapolis home? . Minneapolis homes with 2 . You can limit floor space and reduce costs by adding a shower bathroom. If you want a tub, you will need a little more space. About the only concession you may . Find 7 places for that extra bathroom and discover how much does it cost to add a bathroom. . 4) How to add a bathroom to a small space? Have the door swing . A bathroom addition can range from a small half-bath (sink, toilet and mirror) to a spa-like master bath. Adding a bathroom is usually more expensive per square .