When discussing the calculation of building area, it is particularly important to define the corridor with columns. According to the new specification, for the verandah with enclosure facilities, if the height exceeds 2200mm, this part of the area is included in the total area; If the height is less than 2200mm, only the total area 1/2 is calculated. It is worth noting that the enclosure facilities here include walls, railings and other structures. Cantilever, corridor and eaves gallery also need to be considered, and its calculation rules are based on the premise of retaining structure: if there is a permanent roof but no retaining structure, it will be calculated as12 of the horizontal area of the floor where the structure is located, and if the height exceeds 2.2 meters, it will be included in the overall area, otherwise it will be12.

However, not all exposed structures are included in the construction area. For example, decorative components protruding from the wall, such as columns, foot pads, column-free awnings, outdoor ladders for maintenance, technical floors below 2.2 meters high, chimneys, oil tanks and other independent structures are not included in the calculation. Similarly, there are roof water tanks without enclosure structure, overpasses hung by stage curtains, and operation rooms in single-storey buildings. , also regarded as not included in the construction area.

Generally speaking, the new code clearly stipulates the calculation of the building area of the corridor with columns, and at the same time stipulates which structures and spaces are not included, which is very important for architects and owners to understand the calculation of the building area. In the concrete implementation, we should refer to the authoritative data such as Code for Calculation of Building Area of Building Engineering.