According to the remodeling firm Rempros, a typical medium-sized master bedroom has an area of 190 square feet, while a large master bedroom measures at least 280 square feet. Even smaller master bedrooms should be large enough to hold queen or king size mattresses along with other necessary furniture.
The National Association of Home Builders indicates that the average master bedroom in a newly built home takes up about 12 percent of the total floor space. If the house is between 2,000 and 2,999 square feet, the typical area of the master bedroom runs 231 to 271 square feet. However, if a house has at least 3,000 square feet, the master bedroom is over 400 square feet.