Formula:
Usable area = the sum of the length * width of all rooms in the room except the wall plus the pool area.
Building area = the sum of length * width, including wall and pool area.
7 meters times 10 meters, it is estimated that there is more than 10% of the pool area, which means that a 70-square-meter house is about 60 square meters.
Extended data:
1. Building area: The building area refers to the horizontal projection area of the external wall (column) of the building, including balcony, balcony, basement and outdoor stairs. , and it is a permanent building with solid structure and height exceeding 2.20M (inclusive).
2.* * Building area: elevator shaft, pipeline shaft, stairwell, garbage chute, power distribution room, equipment room, public hall, aisle, basement, guard room on duty, etc. , as well as the construction area of public buildings and management buildings serving the whole building, are calculated according to the horizontal projection area.
3.* * * The construction area also includes half of the horizontal projection area of the partition wall and external wall (including gables) between suites and public buildings. Basements for independent use, carports, garages, guard rooms serving multiple buildings, management rooms and basements for civil air defense projects are not included in the * * * construction area.
4. Sales area: the commercial housing is sold in sets or units, and the sales area of the commercial housing is the sum of the interior or interior construction area purchased by the purchaser (hereinafter referred to as interior construction area) and the public construction area to be shared. Sales area of commercial housing = interior construction area+shared public construction area.
References:
Housing area-Baidu Encyclopedia