Remodel costs vary by size and scope. The average cost of a major remodel for a master bathroom over 100 square feet was $21,000, according to the survey. For bathrooms of 100 square feet or less, the average major remodel cost $12,300. A major remodel was defined as one in which at least the cabinetry, vanity, countertops and toilet were replaced.
The remaining projects were categorized as minor remodels. For master bathrooms over 100 square feet, the average cost for these minor projects was $9,400, while for spaces 100 square feet or smaller, the average cost was $5,400, the survey found.
Those ages 55 and up spent more. Renovating homeowners ages 25 to 34 spent an average of $12,500 on a major remodel of a large master bathroom, while those ages 55 and up spent an average of $22,800. Similarly, the younger group spent an average of $9,200 on a major remodel of a smaller master bathroom, while those ages 55 and up spent an average of $13,900.
See the full study here.