More than 80 percent of new single-family homes have at least two bathrooms, which occupy an average of 300 square feet of floor space, or 12 percent of the total area, according to a study by the National Association of Home Builders.

The home builder’s study reports a major return on value for extra bathrooms: “When the number of bathrooms is approximately equal to the number of bedrooms, an additional half-bath adds about 10 percent to the home’s value, and one additional bath adds about 19 percent.”

A mid-range bathroom remodel, which costs $10,500 on average nationwide, repays a home buyer at least 100 percent of the outlay when the property is sold, the home buyer study concludes.