How to Calculate the Square Meterage of Prefabricated Houses

The calculation of the square meterage of prefabricated houses is primarily based on the structural type of the building and measurement specifications, with different calculation methods for different structural types, as detailed below:

I. Single-story Prefabricated Houses The square meterage of single-story prefabricated houses is calculated as the sum of the horizontal projected areas above the plinth level of the exterior walls. For parts with a height of 2.20 meters or more, the full area is calculated, meaning the horizontal projected area of that part is counted as the total square meterage. For parts with a height of less than 2.20 meters, half of the area is calculated. For example, if the horizontal projected area of a part is 10 square meters and its height is less than 2.20 meters, only 5 square meters are counted. When utilizing the space under a sloped roof, the area calculation method is determined based on the clear height. Parts with a clear height exceeding 2.10 meters are calculated as the full area; parts with a clear height between 1.20 meters and 2.10 meters are calculated as half of the area; and parts with a clear height of less than 1.20 meters are not counted.

II. Multi-story Prefabricated Houses For multi-story prefabricated houses, the first floor is calculated based on the horizontal area of the structural perimeter above the plinth level of the exterior walls, while the second floor and above are calculated based on the horizontal area of the structural perimeter of the exterior walls. For floors with a height of 2.20 meters or more, the full area is calculated; for floors with a height of less than 2.20 meters, half of the area is calculated. In the space under a sloped roof and under stadium stands, if the design utilizes the space, parts with a clear height exceeding 2.10 meters are calculated as the full area; parts with a clear height between 1.20 meters and 2.10 meters are calculated as half of the area; and if the space is not utilized or the indoor clear height is less than 1.20 meters, the area is not counted.

III. Other Structural Types of Prefabricated Houses

1. Balconies: Regardless of the shape and location of the balcony, half of its horizontal projected area is calculated as the square meterage. For example, if the horizontal projected area of a balcony is 8 square meters, only 4 square meters are counted when calculating the square meterage of the prefabricated house.
2. Canopies: For canopies where the width from the outer edge of the structure to the outer edge of the exterior wall structure exceeds 2.10 meters, half of the horizontal projected area of the canopy structure board is calculated as the square meterage; canopies with a width of 2.10 meters or less are not counted.
3. Corridors: For permanent structured corridors with columns, the full area is calculated based on the horizontal area of the column perimeter; for covered corridors without columns, half of the horizontal projected area of the structural floor is calculated; and for uncovered corridors without columns, the building area is generally not counted.