1.0.1 This code is prepared with a view to normalize the calculation of construction areas during the whole process of constructing industrial and civil buildings and to unify the calculation methods therein.
1.0.2 This code is applicable to the calculation of construction areas during the whole process of industrial and civil building construction, extension and renovation.
1.0.3 In addition to this code, the calculation of construction area of building shall also comply with relevant national standards which are currently effective.
2 Terms
2.0.1 Construction area
It refers to the area of grounds and floors of a building (including its walls).
2.0.2 Floor
It refers to the storey of a building which is divided according to the structure of grounds and floors.
2.0.3 Structure story height
It refers to the vertical distance from the upper surface of the floor/ground structure storey to the upper surface of the upper structure storey.
2.0.4 Building enclosure
It refers to the walls, doors and windows enclosing the space.
2.0.5 Space
It refers to the area defined by building interface for people's living and activities.
2.0.6 Structure net height
It refers to the vertical distance from the upper surface of the floor/ground structure storey to the lower surface of the upper structure layer.
2.0.7 Enclosure facilities
It refers to the fences established for safety, such as handrails and breast boards etc.
2.0.8 Basement
It refers to the room with its indoor ground level lower than the outdoor ground level for more than 1/2 of its interior net storey height.
2.0.9 Semi-basement
It refers to the room with its indoor ground level lower than the outdoor ground level for more than 1/3 but not more than 1/2 of its interior net storey height.
2.0.10 Stilt floor
It refers to the open space storey with only structural support and without building enclosure outside.
2.0.11 Corridor
It refers to the horizontal traffic space inside a building.
2.0.12 Elevated corridor
It refers to the space arranged on the second storey or above of a building for the horizontal traffic with other building(s).
2.0.13 Structure layer
It refers to the load-bearing floor in the whole structure system.
2.0.14 French window
It refers to the window protruding from the external wall surface and with its bottom mounted to the floor.
2.0.15 Bay window
It refers to the window protruding from the external wall of the building.
2.0.16 Eaves gallery
It refers to the horizontal traffic space below the eaves of building.
2.0.17 Overhanging corridor
It refers to the horizontal traffic space protruding form the external wall of a building.
2.0.18 Air lock
It refers to the space between two doors at the entrance of a building.
2.0.19 Canopy
It refers to the apparatus established above the entrance/exit of building to keep out the rain.
2.0.20 Porch
It refers to the semi-enclosed space in front of the building entrance.
2.0.2l Stairs
It refers to the building element used for the vertical traffic between storeys, which consists of continuous steps, rest platform, safety handrails (or breast board) and relevant supporting structures.
2.0.22 Balcony
It refers to the outdoor space for human activities which is established on the external wall of the building and equipped with handrail or breast board.
2.0.23 Major structure
It refers to the structure receiving, bearing and transferring all the upper load of the building and maintaining the organic relations of the integrity, stability and safety of upper structure.
2.0.24 Deformation joint
It refers to the structural joint reserved to prevent the building from cracking or even being damaged while subjected to certain factors.
2.0.25 Overhang
It refers to the building of which the bottom storey is recessed along the street to reserve space for pedestrians.
2.0.26 Overhead building
It refers to the building crossing over a road and being connected to buildings on both sides of the road.
2.0.27 Passage
It refers to the space arranged to pass through the building.
2.0.28 Terrace
It refers to the platform set on the roof, first floor or canopy for outdoor activities of people, which is provided with enclosure facilities.
2.0.29 Plinth
It refers to the finish protecting structure established on the external wall bottom of a building.
2.0.30 Step
It refers to the level surface arranged in echelon for foot to place, which is set to connect indoor and outdoor terraces or different levels of storey.
3 Calculation Rules of Construction Area
3.0.1 The construction area of a building shall be calculated as the sum of horizontal areas of the floor counted to the periphery of its external walls. For those with structure storey height of or over 2.20m, the gross area shall be calculated; for those with such height below 2.20m, 1/2 of the area shall be calculated.
3.0.2 In case that a building has local storeys inside, the second and above storeys shall be calculated as the horizontal area of the building enclosure counted to the periphery if it has such enclosure, or as the horizontal area of its structure bottom slab if it does not has building enclosure. For those with structure storey height of or above 2.20m, the gross area shall be calculated; for those with such height below 2.20m, 1/2 of the area shall be calculated.
3.0.3 For gable roofs forming spaces, their parts with a structure net height at and above 2.10m shall be calculated for their gross areas, their parts with such height below 2.10m but at and above 1.20m shall be calculated for1/2 of their areas, and their parts with such height below 1.20m shall not be calculated for their areas.
3.0.4 For spaces under spectator stand of venues, their parts with structure net height at and above 2.10m shall be calculated for their gross areas, their parts with structure net height below 2.10m but at and above 1.20m shall be calculated for 1/2 of their areas, and their parts with such height below 1.20m shall not be calculated for their areas. For overhang spectator stand with enclosure facilities which is established separately indoor, its construction area shall be calculated as the horizontal projected area of its structure bottom slab. For spectator stands of venues with top cover but without building enclosures, their areas shall be calculated as 1/2 of the horizontal projected area of their top covers.
3.0.5 Basement and semi-basement shall be calculated according to the horizontal areas of their structures counted to their peripheries. As for those with structure storey height at or above 2.20m, their gross areas shall be counted; as for those with such height below 2.20m, 1/2 of their areas shall be counted.
3.0.6 Positions with top covers outside the external wall of entrance/exit shall be calculated as 1/2 of the horizontal area of the external wall structure counted to the periphery.
3.0.7 The stilt floor of building and the suspended stilt floor of building on slope land shall be calculated with the horizontal projection areas of their top plates as their construction areas. As for those with structure storey height at or above 2.20m, the gross area shall be calculated; as for those with such height below 2.20m, 1/2 of the area shall be calculated.
3.0.8 The hallway and hall of a building shall be calculated as just one storey as for their construction areas, and the corridors inside them shall be calculated according to the horizontal projected areas of their structural base plates for their construction areas. For those with structure net height of or above 2.20m, the gross area shall be calculated; for those with such height below 2.20m, 1/2 of the area shall be calculated.
1 总则
2 术语
3 计算建筑面积的规定
本规范用词说明
附：条文说明
GB/T 50353-2013 The following standards are cited：
