Can the second floor be different from the first floor?

The floor with a building area of 1 is different from the floors above the second floor: the first floor is generally called the first floor plane, the standard floor is more than two floors, and the general floor is the standard floor. So the area of the first floor is definitely different from the standard floor. For residential buildings, there is a unit door entrance on the first floor, which is the area.

Building area, a real estate term, is directly related to the calculation of usable area and utilization rate. According to different countries and regions, its definition and measurement standards may not be consistent. The building area is generally larger than the usable area. Building area is an important technical and economic index in the field of construction engineering, and it is also one of the important indexes of national macro-control. Construction area refers to the horizontal area of the periphery of the structure above the toe of the external wall of the building, and it is a physical quantity index that reflects the scale of the building in square meters.

Construction area, also known as building development area, refers to the plane area of each floor measured from the peripheral horizontal plane above the foot of the external wall of residential buildings. It is an economic indicator of building size. The construction area of each floor is calculated according to the horizontal section of the external wall above the toe of the building. Including usable area, auxiliary area and structural area. In China Mainland, the laws and regulations related to the construction area include "Calculation Rules for Allocation of Commercial Housing Sales Area and Public Construction Area" and the current calculation rules for construction area. In China and Hong Kong, the calculation of construction area and usable area should follow the Code of Practice for Surveying issued by the Hong Kong Institute of Surveyors. There are building technical specifications in Taiwan Province Province, China, and the volume control in Chapter 9 is the specification of volume ratio and building area.

The construction area of the project is inconsistent with the actual area. The usable area is also called carpet area/net area, which is the area after the carpet is laid underground and covered.

The usable area is actually the interior area, and the construction area is the interior area plus the pool area occupied by each household.