cost to add a bathroom to a house
âSay you have an older row house that sells for $70,000 on a good day,â she says. âIf you add a $30,000 bath to that house, youâre not going to have a $100,000 house. Youâre going to have a $70,000 house with a really expensive bathroom.â. A general rule of thumb is that you should only undertake a major remodeling project if you plan to stay in your home at least five years.