What is the usable floor area of a house with a building area of 8 1?

This cannot be calculated. It depends on the structure of your house. The building area refers to the area of the first floor shared by each household, including stairs, elevators and all walls. Generally speaking, if it is 865,438+0 square meters, the use area in the south should be about 65 square meters, and the north may only be about 60. If it is a high-rise building, it is estimated that it is only about 55 or 50 if the elevator is subtracted.