1. The area of prefab house is the outer wall length*width*layers.
2. Outdoor staircase and walkways are calculated according to the sum of the projection areas of the natural layer.
3. Canopy is calculated by half of level projection area.
4. The panel outside the wall will not counting the area.
5. Total area = (1) + (2) + (3).
6. The standard layer has two staircases which left&right side both have one.Each staircase is 4.5sqm,when increase or decrease the staircase,it could be counted according to the number of staircases.
7. Unless specified,the amount of engineering calculation methods are adjusted according to the above calculation formula.