Work out floor area of house instantly with clear inputs, formula shown and shareable results.
Internal floor area is the sum of every room plus circulation space. The circulation share is a useful efficiency measure: below about 12% is very efficient, while above 20% suggests a lot of area is going into halls and landings rather than usable rooms.
Floor area
total = sum of room areas + circulation; 1 m2 = 10.7639 ft2
Close. GIA measures to the inside face of external walls and includes internal partitions, so it is slightly larger than the sum of room areas.
You pay for it in build cost and heating but cannot furnish it. Efficient plans keep it low without making the house feel cramped.