First, the effective calculation part

In residential buildings, the scope and method of calculating the construction area are:

1, single-story building, regardless of height, is calculated as one floor, and its construction area is calculated as the horizontal area above the external wall of the building. Part of the floors (such as the attic) of the single-storey residential building area should also be calculated.

2. The construction area of multi-storey or high-rise residential buildings is calculated according to the sum of the construction areas of each floor, the bottom floor is calculated according to the peripheral horizontal area above the toe of the external wall of the building, and the second floor is calculated according to the peripheral horizontal area of the external wall.

3. The construction area of the basement, semi-basement and corresponding entrances and exits shall be calculated according to the horizontal area of the periphery of the upper external wall (excluding the lighting well, moisture-proof layer and its protective wall).

4. Use deep foundation as underground overhead floor. 2.2 meters high, the construction area is calculated by half of the horizontal area outside the overhead floor.

5, through the building channel, the hall in the building, hall, regardless of height, are calculated according to a floor construction area. The hall corridor is calculated according to its horizontal projection area.

6. The construction area of elevator shaft, elevator shaft, garbage chute, pipeline shaft and chimney with wall shall be calculated according to the natural floor of the building.

7. The technical floor in the residential building (used for placing all kinds of equipment and maintenance) is more than 2.2m high, and the construction area shall be calculated according to the horizontal area outside the technical floor.

8. When the width from the outer edge line of canopy structure to the outer edge line of external wall structure exceeds 2. 10m, the area shall be calculated as half of the horizontal projection area of canopy structure plate (the calculation of canopy with columns and canopy without columns shall be consistent).

9. Staircase, water tank room, elevator machine room, etc. With prominent building envelope, its construction area is calculated according to the horizontal area of the periphery of the building envelope.

10. The overhead corridor with a roof between two buildings shall be calculated according to the projected area of the corridor. The construction area of overhead corridor without roof is calculated as half of its projected area.

1 1. Doors protruding from the wall and overlooking rooms, the construction area is calculated according to the horizontal area of the periphery of the envelope.

12, the balcony of the building is calculated as12 of its horizontal projection area. Whether the balcony is a balcony or a concave balcony, whether it is a closed balcony or not, the construction area of the balcony is calculated as 1/2 of the horizontal area of the balcony.

13. If there are no stairs in the residential building and there are outdoor stairs (including evacuation stairs), the outdoor stairs shall be calculated according to the horizontal projection area of each floor; If there are stairs in the building and there are outdoor stairs (including evacuation stairs), the outdoor stairs shall be calculated according to half of the horizontal projection area of each floor.

14, calculate the scope of the total construction area.

(1) The building is calculated according to the horizontal area of the external wall above the toe, and the multi-storey building is calculated according to the sum of the building areas of each floor.

(2) The part with an indoor clear height of more than 2.00 meters (including 2.00 meters) in staggered floors, pavilions (dark buildings) and sloping roofs shall be calculated according to its projected area.

(3) Stairwells and elevators with the upper storey height of more than 2.20m (including 2.20m) shall be calculated according to the horizontal projection area of the periphery of the structure.

(4) If the height of floors, mezzanines, basements and independently built bicycle houses and garages exceeds 2.20m, it shall be calculated according to the horizontal projection area of the structure periphery.

(5) If the glass curtain wall is used as the external wall of the house, it shall be calculated according to the horizontal projection area of its periphery. If it is not used as an external wall only for decoration, it shall be calculated according to the horizontal projection area of the periphery of the structure.

(6) For houses with expansion joints, if they are connected with rooms, the construction area shall be calculated by expansion joints.

(7) Outdoor stairs with roofs are calculated according to the horizontal projection area of each floor.

(8) Cantilever buildings, fully enclosed balconies and verandahs shall be calculated according to the horizontal projection area of the structural periphery.

(9) No matter how high the floors are, the building area of duplex buildings and jump floors shall be calculated as one floor. Stair wells are not recognized as empty floors.

Second, the invalid calculation part

In addition, in residential buildings, the scope of not calculating the construction area is:

1. Components and accessories, artistic decorations and hanging boards protruding from the wall, such as columns, cribs and footstools.

2. Outdoor ladders for maintenance and fire fighting, steel ladders with a width less than 60 cm.

3 chimneys, flues, water storage tanks and other structures that are not independently attached to the external wall.

4. Roof water tank room without enclosure structure.

5. Technical layer (equipment layer) with a height less than 2.2m ..

6. Single-storey rooms such as operation room, control room and instrument room of single-storey houses.

7, the height is less than 2.2 meters deep foundation underground overhead floor, the space for hanging tripods on inclined buildings.

Calculation of leveling ground

The leveling site is calculated in square meters according to the first floor area of the building (if the single floor area of the basement is larger than the first floor area, the largest single floor area of the basement shall prevail).

Engineering quantity: calculated according to the first floor construction area.

List valuation: the leveling site is calculated according to the construction area of the first floor of the building.

Quota valuation: the leveling site is calculated in square meters according to the area of the first floor of the building (if the single floor area of the basement is larger than the first floor area, it is calculated according to the maximum single floor area of the basement). Calculate the structure in square meters by multiplying the area at the bottom of the foundation by a factor of 2.

Code for Engineering Quantity Calculation of Building Decoration Engineering with Bill of Quantities (GB 50854-20 13)

The calculation method of quota pricing varies from province to province.

Extended data

The National Unified Construction Area Calculation Rules is a normative document 1982 promulgated by the State Economic Commission, and its main calculation rules are as follows:

Calculation range of building area

(1) No matter the height of a single-storey building, it is calculated as one floor, and its construction area is calculated as the horizontal area above the external wall of the building. If there are several floors in a single-story building, the building area should also be calculated.

(2) For high-low span single-story buildings, if the construction area needs to be calculated separately, when the high span is a side span, the construction area shall be calculated by multiplying the horizontal length between the outer surfaces of gables at both ends above the footstool by the horizontal width of the outer surface of the outer wall above the footstool to the edge line of the middle column of the high span; When the high span is a middle span, its construction area should be calculated by multiplying the horizontal length between the outer surfaces of gables at both ends above the foot by the horizontal width between the outer lines of the central column.

(3) The construction area of multi-storey buildings is calculated according to the sum of the construction areas of each floor, and the bottom floor is calculated according to the horizontal area above the external wall of the building; The second floor and above are calculated according to the horizontal area of the external wall.

(4) Construction area of basement, semi-basement, underground workshop, warehouse, store, underground headquarters, etc. The corresponding entrances and exits are calculated according to the horizontal area of the outer wall (excluding the light well, moisture-proof layer and its protective wall).

(5) If the deep foundation is used as the underground overhead floor, and the floor height exceeds 2.2m, the construction area shall be calculated as half of the horizontal area outside the overhead floor.

(6) The hanging feet of inclined buildings are used as overhead floors at work, and the height is more than 2.2m.. The construction area is calculated according to the horizontal area around the envelope.

(7) The building area is not calculated for the passage through the building, and the floor area is calculated for the foyer and foyer in the building regardless of their height. Halls and corridors in hallways should be calculated according to their horizontal projection area.

(8) The construction area of library stacks is calculated according to the number of shelves.

(9) The construction area of elevator shaft, elevator shaft, garbage chute and pipeline shaft shall be calculated according to the natural floor of the building.

(10) The construction area of the stage lighting control room is calculated by multiplying the horizontal area of the periphery of the envelope by the actual number of floors.

(1 1) If the technical height in the building exceeds 2.2m, the construction area shall be calculated.

(12) The construction area of the awning with columns is calculated according to the horizontal area around the columns, and the awning with independent columns is calculated according to half of the horizontal projection area of the top cover.

(13) The construction area of carports and platforms with columns is calculated according to the horizontal area around the columns; The construction area of carports, carports and platforms with single-row columns and independent columns shall be calculated as half of the horizontal projection area of the top cover.

(14) The construction area of stairwell, water tank room and elevator machine room with envelope protruding from the roof shall be calculated according to the horizontal area around the envelope.

(15) The door protruding from the wall is calculated according to the horizontal area of the periphery of the enclosure structure.

(16) Balcony and corridor are closed, and the construction area is calculated according to its horizontal projection area. The construction area of concave balcony and cantilever balcony is calculated according to half of its horizontal projection area.

(17) The corridor and eaves gallery with roof and column outside the building wall shall be calculated according to the horizontal area of the column. The construction area of columnless corridor and eaves gallery is calculated according to half of its projected area.

(18) For an overhead corridor with a roof between two buildings, the construction area shall be calculated according to the projected area of the corridor. Overhead corridor without roof is calculated as half of its projected area.

(19) The outdoor staircase as the main passage and evacuation is calculated according to the horizontal projection area of each floor; If there are stairs in the building, the outdoor stairs are calculated according to half of the horizontal projection area.

(20) If the elevated single-story building spans other buildings and structures, the construction area shall be calculated according to its horizontal projection area; if it is a multi-story building, it shall be calculated according to the multi-story.