The following contents are comprehensively sorted out by the “planner” of WeChat official account: there is no provision on building area in the original Standard, and the main provisions are based on the Code for Calculation of Building Area of Building Engineering (GB/T50353-2013) (hereinafter referred to as the “Area Calculation Code”).
(1) For Clause 3.0.1, can the definition of “the building area of the building shall be calculated according to the horizontal area of the outer wall structure of the natural floor” be equal to the value of “the base area of the whole building”? (2) For the “base area of the whole building” in (1), if this building is N standard floors, and the building type design of each floor is identical.
The Code for Real Estate Survey (GB/T17986-2000), which is known in the industry, stipulates that the balcony is calculated according to the closed state: the latest provisions of the General Code for Civil Buildings (GB55031-2022): at the same time, it should also inherit the definitions of “enclosure structure” and “enclosure facilities” in the Code for the Calculation of Building Area of Building Engineering (GBT50353-2013): 2.0.4 enclosure building enclosure enclosing the walls, doors and windows of the building space.
It can be predicted that the status and time determination of “balcony closed” will become the focus of controversy again.
The “balcony is in the main structure” in this definition is related to whether the balcony is closed or not? 2021-09-23 Reply: 1.
It can be seen that: 1.
The building area of outdoor balcony, awning, eaves gallery, outdoor corridor, outdoor stairs, etc.
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 outer wall structure of the natural floor.
So, should the allocated base area of 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 according to the horizontal area of its structure periphery”.
There is no direct relationship between the balcony in the main structure and whether the balcony is closed.
It can be seen that the calculation rules of the building area of the balcony have changed.
This specification is a mandatory engineering construction specification, and all provisions must be strictly implemented.
Article description 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 of the floor height of the calculated area structure.
Look at Article 3.1.5, which is described as “enclosure facilities”, and the latter paragraph, which is described as “balcony closed”.
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.
There is no provision on area allocation in GBT50353-2013 Code for Calculation of Building Area of Building Engineering; 3.
If the structural floor height is 2.20m and above, the total area shall be calculated; If the structural floor height is below 2.20m, 1/2 area shall be calculated.
It is clear that the total building area is calculated by the sum of the aboveground and underground building areas.
The building area is adjusted from the original area calculation specification (GBT50353) to the new specification, which states that “the calculation is based on the sum of the horizontal areas of the outer wall structure of the natural floor”, to “the calculation of the horizontal projected area of the space enclosed by the outer surface of the enclosure structure at each natural floor (ground)”.
Article Note 3.0.21 The balcony of the building, regardless of its form, shall be calculated separately with the main structure of the building as the boundary.
2.
In fact, it should be understood in combination with the provisions of 3.1.4.
The peripheral area of the external wall structure of the natural floor cannot be equal to the base area; 2.
The latest provisions of GB55031-2022 General Code for Civil Buildings: II.
The “balcony is in the main structure” in this definition is related to whether the balcony is closed or not? 2021-09-23 Reply: 3.
2.0.7 Enclosures Enclosures such as railings and balustrades set up to ensure safety.
The balcony building area is within the scope of “if the relevant provisions in the current engineering construction standards are inconsistent with this code, the provisions of this code shall prevail”.
In the Code for Calculation of Building Area of Building Engineering (GB/T50353-2013), the Ministry of Housing and Urban-Rural Development answered: (3) In the 3.0.21 clause, “the balcony in the main structure shall be calculated as the total area of the horizontal area of its structure periphery”.
The national standard GB55031-2022 General Code for Civil Buildings will be implemented from March 1, 2023.
When the external wall structure itself is unequal in thickness within a range of floor height, it is calculated by the peripheral horizontal area at the elevation of the floor structure.
However, it is worth noting that it has effectively connected with the real estate survey specifications.
outside the main structure shall be calculated according to the corresponding provisions.
3、 For outdoor design floor: it is within the scope of “if the relevant provisions in the current engineering construction standards are inconsistent with this specification, the provisions of this specification shall prevail”.
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The Ministry of Housing and Urban-Rural Development answered questions in the Code for Calculation of Building Area of Building Engineering (GB/T50353-2013): please consult the following understanding of building area in the Code for Calculation of Building Area of Building Engineering (GBT50353-2013).
In 3.0.21 of GBT50353-2013 Code for Calculation of Building Area of Building Engineering, the balcony in the main structure shall be calculated according to the horizontal area of its structure periphery; The balcony outside the main structure shall be calculated as 1/2 of the horizontal projected area of its structural floor.
There is no direct relationship between the balcony in the main structure and whether the balcony is closed.