# Building area calculation rules to share, how to calculate to have a spectrum! (attached figure)

14.

The floor window attached to the exterior wall of the building shall be calculated according to the peripheral horizontal area of its enclosure structure.

Indoor stairs, elevator shafts, lift shafts, pipe shafts, ventilation and exhaust shafts and flues of buildings shall be incorporated into the natural floor of the building to calculate the building area.

The area of daylighting well with top cover shall be calculated according to one floor.

If the floor height of the structure is 2.20M or above, the full area shall be calculated; If the floor height of the structure is less than 2.20M, 1 / 2 of the area shall be calculated.

6.

When there are local floors in the building, for the two floors and above of local floors, if there is an enclosure structure, it shall be calculated according to the peripheral horizontal area of the enclosure structure, if there is no enclosure structure, it shall be calculated according to the horizontal area of the structural floor, if the structural floor height is 2.20M or above, the full area shall be calculated, and if the structural floor height is less than 2.20M, 1 / 2 area shall be calculated.

The external insulation layer of the external wall of the building shall be calculated according to the horizontal cross-sectional area of the insulation material and included in the building area of the natural layer.

(the window here: one is attached to the outer wall of the building, and the other is landing)   13.

(the plinth is not considered when calculating the building area) 2.

For the sloping roof forming the building space, the full area shall be calculated for the part with the clear height of the structure of 2.10m and above; 1 / 2 area shall be calculated for parts with clear height of 1.20m and above to 2.10m; Where the clear height of the structure is less than 1.20m, the building area shall not be calculated.

The convex (floating) window whose height difference between the windowsill and the indoor floor is less than 0.45M and the clear height of the structure is 2.10m or more shall be calculated as 1 / 2 of the peripheral horizontal area of its enclosure structure.

15.

The full area of the balcony in the main structure shall be calculated according to the peripheral horizontal area of the structure; For the balcony outside the main structure, 1 / 2 of the area shall be calculated according to the horizontal projection area of the structural bottom plate.

(the cloister is a kind of corridor.

From the beginning of land acquisition, project estimation, design budget estimation, project bidding, construction process, completion final accounts and cost analysis, you need to accurately calculate the building area.

11.

Where there is a top cover on the ramp outside the exterior wall of the entrance and exit, the area shall be calculated according to 1 / 2 of the peripheral horizontal area of the exterior wall structure.

If the floor height of the structure is 2.20M or above, the full area shall be calculated; If the floor height of the structure is less than 2.20M, 1 / 2 of the area shall be calculated.

The building area of the porch shall be calculated according to 1 / 2 of the horizontal projected area of its roof; The building area of column canopy shall be calculated according to 1 / 2 of the horizontal projection area of its structural plate; If the width from the outer boundary line of the structure without column awning to the outer boundary line of the external wall structure is 2.10m or more, the building area shall be calculated according to 1 / 2 of the horizontal projection area of the awning structure plate.

25.

The construction area of car shed, goods shed, platform, gas station, toll station, etc.

7.

Outdoor stairs shall be incorporated into the natural floor of the attached building, and the building area shall be calculated according to 1 / 2 of its horizontal projection area.

If there is no structural layer, it shall be calculated as one layer, and if there is a structural layer, it shall be calculated respectively according to the area of its structural layer.

For buildings with curtain wall as enclosure structure, the building area shall be calculated according to the outer edge line of curtain wall.

The building area of the curtain wall directly acting as the enclosure of the outer wall is calculated according to its outer edge line; The building area shall not be calculated for the curtain wall set outside the building wall for decoration.

The building area of the lobby and Hall of the building shall be calculated according to one floor, and the building area of the corridor set in the lobby and hall shall be calculated according to the horizontal projection area of the floor of the corridor structure.

If the floor height of the structure is 2.20M or above, the full area shall be calculated; If the floor height of the structure is less than 2.20M, 1 / 2 of the area shall be calculated.

（1） Scope and rules of building area to be calculated 1.

For the overhead floor of buildings and the overhead floor of hanging feet of buildings on slopes, the building area shall be calculated according to the horizontal projection of their roof.

4.

If the floor height of the structure is 2.20M or above, the full area shall be calculated; If the floor height of the structure is less than 2.20M, 1 / 2 of the area shall be calculated.

The basement and semi basement shall be calculated according to the peripheral horizontal area of the structure.

The stage lighting control room with enclosure structure shall be calculated according to the peripheral horizontal area of its enclosure structure.

If the clear height of the structure is 2.10m or more, the full area shall be calculated; If the clear height of the structure is less than 2.10m, 1 / 2 of the area shall be calculated.

22.

If the floor height of the structure is 2.20M or above, the full area shall be calculated; If the floor height of the structure is less than 2.20M, 1 / 2 of the area shall be calculated.

If the floor height of the structure is 2.20M or above, the full area shall be calculated; If the floor height of the structure is less than 2.20M, 1 / 2 of the area shall be calculated.

18.

(with enclosure facilities)   (with enclosure structure) 10.

If the floor height of the structure is 2.20M or above, the full area shall be calculated; If the floor height of the structure is less than 2.20M, 1 / 2 of the area shall be calculated.

Whether you are in the construction unit, the construction unit or the consulting company, you need to understand this calculation rule.

For buildings with high and low spans, when the high and low spans are connected internally, the deformation joint shall be calculated within the area of low span..

The curtain wall is distinguished by its role and function in the building.

16.

23.

The lobby is calculated as one floor.)    9.

19.

The area of stadium stands with roof and without enclosure structure shall be calculated as 1 / 2 of the horizontal projection area of the roof.

on the top of buildings with enclosure structure, if the structural floor height is 2.20M or above, the full area shall be calculated; If the floor height of the structure is less than 2.20M, 1 / 2 of the area shall be calculated.

For the overhead corridor between buildings with top cover and enclosure structure, the full area shall be calculated according to the peripheral horizontal area of the enclosure structure; If there is no enclosure structure and enclosure facilities, 1 / 2 of the area shall be calculated according to the horizontal projection area of the structural base plate.

3.

21.

24.

For the building space under the grandstand of the venue, the full area shall be calculated for the parts with a clear height of 2.10m and above; 1 / 2 area shall be calculated for parts with clear height of 1.20m and above to 2.10m; Where the clear height of the structure is less than 1.20m, the building area shall not be calculated.

The building area of the building shall be calculated according to the sum of the peripheral horizontal area of the natural floor external wall structure.

For the outdoor corridor (cantilever corridor) with enclosure facilities, 1 / 2 of the area shall be calculated according to the horizontal projection area of its structural floor; For the eaves gallery with enclosure facilities (or columns), 1 / 2 of the area shall be calculated according to the peripheral horizontal area of the enclosure facilities (or columns).

(if there is only one floor, the building area will not be calculated separately)   12.

17.

For staircases, water tank rooms, elevator machine rooms, etc.

20.

If the building envelope is not perpendicular to the horizontal plane, it shall be calculated according to the horizontal area of the outer wall periphery of its bottom plate surface.

For the three-dimensional library, three-dimensional warehouse and three-dimensional garage with enclosure structure, the building area shall be calculated according to the peripheral horizontal area of the enclosure structure; If there is no enclosure structure or enclosure facilities, the building area shall be calculated according to the horizontal projected area of the structural base plate.

The building area of the door bucket shall be calculated according to the peripheral horizontal area of its enclosure structure, and the full area shall be calculated if the structural floor height is 2.20M or above; If the floor height of the structure is less than 2.20M, 1 / 2 of the area shall be calculated.

The deformation joint connected with the room shall be calculated according to its natural layer and incorporated into the building area.

Where the clear height of the structure is 2.10m or above, the full area shall be calculated; Where the clear height of the structure is 1.20m or more to 2.10m or less, 1 / 2 of the area shall be calculated; Where the clear height of the structure is less than 1.20m, the building area shall not be calculated.

5.

8.

For overhanging stands with enclosure facilities set separately indoors, the building area shall be calculated according to the horizontal projection area of the base plate of the stand structure.

with top cover but without enclosure structure shall be calculated according to 1 / 2 of the horizontal projection area of its top cover.

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