It belongs to the developer. First, when developers take land, there will be a floor area ratio requirement in the land transfer conditions, which limits the upper limit of the construction area that developers can do. The calculation basis of floor area ratio is the national standard code "Code for Calculation of Building Area of Building Engineering". Among them, article 3.0.2 1 stipulates that "the balcony in the main structure shall be calculated according to the horizontal area of the periphery of the structure; For the balcony outside the main structure, the area of 1/2 should be calculated according to the horizontal projection area of the structural layer. " This specification calculates the balcony area regardless of whether the balcony is closed or not. The distinction between the inside and outside of the main structure is too professional, so I won't elaborate on it in this article. It can be simply understood that the protruding balcony is the balcony outside the main structure, and the recessed balcony is the balcony inside the main structure. In order to reduce the capacity area, developers usually make balconies outside the main structure, that is, balconies with only half the area. In other words, the capacity area of the balcony is generally only half.
Second, the real estate area is the sales area when the developer sells the house. That is, the area on the real estate license. The calculation basis of real estate area is Technical Specification for Housing Area Calculation.