The cost to add a bathroom to a house varies depending on factors such as location, size, and complexity of the addition. On average, it can range from $10,000 to $50,000 or more. Costs include construction, plumbing, electrical work, and finishing touches. A detailed estimate from a contractor will provide a more accurate figure based on your specific project needs.

Costs range from $10,000 to $50,000 or more, depending on various factors.