1 About the attic:
Article 3.0. 17 of Code for Calculation of Building Area of Building Engineering stipulates: stairwell, water tank room, elevator machine room, etc. , located at the top of the building with a retaining structure, if the height of the structure is 2.20m or more, it should be calculated as the whole area; If the height of the structure is below 2.20m, the area of 1/2 shall be calculated.
2. About the balcony:
Only half of the gifts were given. According to Article 3.0. 12 of Code for Calculation of Building Area of Building Engineering, the floor-to-ceiling windows attached to the external walls of buildings should be calculated according to the horizontal area of the periphery of the envelope. If the height of the structure is 2.20m or more, the total area shall be calculated; If the height of the structure is below 2.20m, the area of 1/2 shall be calculated.
Therefore, the area calculation of the attic is correct, but the balcony is not fully delivered.
Extended data:
Should not be calculated as public building area is as follows:
1. Basement, garage, etc. Independent use space that has been sold or leased should not be included in the public building area.
2, as a civil air defense project basement is not included in the public building area.
3. Space under the stairs If the building area of the stairs has been calculated, the building area will not be calculated regardless of whether the space under it is used or not.
4. For buildings facing the street in public passages, verandahs with overhangs are used as public roads and streets, regardless of whether there are columns or maintenance structures, the construction area is not counted.
5. Buildings similar to balconies, overhanging corridors and eaves galleries that are not connected with the interior are not included in the construction area.
Reference source 1: Baidu Encyclopedia-Code for Calculation of Building Area of Building Engineering
Reference 2: Baidu Encyclopedia-Calculation of Commercial Housing Sales Area and Allocation Rules of Public Building Area