2.
The peripheral area of the external wall structure of the natural floor cannot be equal to the base area; 2.
(1) In Clause 3.0.1, “The building area of the building shall be calculated according to the horizontal area of the outer wall structure of the natural floor.” Can the definition of be equal to the value of “base area of the whole building”? (2) For the “base area of the whole building” in (1), if the building is N standard floor, and the design of each floor is identical.
3.0.21 in GBT50353-2013 Code for Calculation of Building Area of Building Engineering, the full area of 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, 1/2 area shall be calculated according to the horizontal projection area of the structural floor.
Then, should the base area shared by each floor be equal to the building area defined in 1/N (1)? (3) In Clause 3.0.21, “the balcony in the main structure shall be calculated as the total area according to the horizontal area of the periphery of the structure”.
The latest provisions of GB55031-2022 General Code for Civil Buildings: II.
If the structural storey height is 2.20m or above, the total area shall be calculated; 1/2 area shall be calculated if the structural floor height is less than 2.20m.
Article 3.0.21 The building area of the balcony of a building, regardless of its form, shall be calculated respectively with the main structure of the building as the boundary.
Specify that the total building area is calculated by the sum of the above ground and underground building areas.
The building area of outdoor balconies, awnings, canopies, outdoor corridors, outdoor staircases, etc.
There is no provision on area allocation in GBT50353-2013 Code for Calculation of Building Area of Building Engineering; 3.
It can be seen that: 1.
It can be predicted that the status and time determination of “balcony closed” will become the focus of controversy again.
On August 25, 2022, the Ministry of Housing and Urban Rural Development approved the General Code for Civil Buildings as a national standard, numbered GB55031-2022, which will be implemented from March 1, 2023.
Code for Calculation of Building Area of Building Engineering (GB/T50353-2013) Q&A of the Ministry of Housing and Urban Rural Development: (3) In Clause 3.0.21, “the balcony in the main structure shall be calculated as the full area according to the horizontal area of its structure periphery”.
The balcony in the main structure is not directly related to whether it is closed.
According to “In case of any inconsistency between the relevant provisions of the current engineering construction standards and this specification, the provisions of this specification shall prevail”, the Code for Calculation of Building Area of Building Engineering GB/T50353-2013 is also within the scope of this specification.
1、 Code for Calculation of Building Area of Building Engineering GB/T50353-2013:3.0.1 The building area of a building shall be calculated as the sum of the horizontal areas of the periphery of the natural floor exterior wall structure.
The original Standard has no provisions on building area, and the main provisions are in accordance with the Code for Calculation of Building Area of Building Engineering GB/T50353-2013 (hereinafter referred to as the “Code for Area Calculation”).
In fact, it should be understood in combination with the provisions of 3.1.4.
Is the “balcony in the main structure” in this definition related to whether the balcony is closed? Reply from 2021-09-23: 1.
Code for Calculation of Building Area of Building Engineering (GB/T50353-2013) Q&A of the Ministry of Housing and Urban Rural Development: Please consult the following understanding of building area in GBT50353-2013 Code for Calculation of Building Area of Building Engineering.
Is the “balcony in the main structure” in this definition related to whether the balcony is closed? Reply from September 23, 2021: 3.
3、 As for the outdoor design floor, it belongs to the scope of restriction of “if the relevant provisions in the current engineering construction standards are inconsistent with this specification, the provisions in this specification shall prevail”..
2.0.7 Enclosures: railings, breast boards and other enclosures set for safety.
There is no direct relationship between the balcony in the main structure and whether the balcony is closed.
The Code for Real Estate Surveying GB/T17986-2000, which is known in the industry, stipulates that the balcony is calculated according to the closed state.
Balcony floor area: it is within the scope of the restriction of “if the relevant provisions in the current project construction standards are inconsistent with this specification, the provisions of this specification shall prevail”.
The latest provisions of GB55031-2022 General Code for Civil Buildings: at the same time, the definition of “enclosure structure” and “enclosure facilities” in GBT50353-2013 Code for Calculation of Building Area of Building Engineering shall also be inherited: 2.0.4 Walls, doors and windows enclosing building space.
However, it is worth noting that it is effectively connected with the housing survey specification.
It can be seen that the calculation rules for the building area of the balcony have changed.
When the external wall structure itself is unequal in thickness within a floor height range, it is calculated by the peripheral horizontal area of the floor structure elevation.
Article 3.0.1 Calculation of building area: the building space formed in the main structure shall be calculated according to the provisions of this article if it meets the requirements for calculating the floor height of the structure.
The following paragraph refers to the situation of “closed balcony”, while the clause 3.1.5 refers to “enclosure facilities”.
outside the main structure shall be calculated according to the corresponding provisions.
The building area is changed from the original area calculation specification (GBT50353), which states “calculated by the sum of the horizontal areas of the outer wall structure of the natural floor”, to the new specification, which states “calculated by the horizontal projected area of the space surrounding the outer surface of the enclosure structure at each natural floor (ground)”.