3.0.27 The construction area is not calculated for the following items:

1 Building components that are not connected with the building;

2. Open public space and building access at the bottom of arcade and street building;

3. Overbridges and platforms with curtains and scenery hanging on the stage and backstage;

Terraces, outdoor swimming pools, flower stands, roof water tanks and decorative structural members;

5 operating platform, feeding platform, installation box and tank platform in the building;

6. Legs, wall columns, cribs, steps, wall plastering, decorative surfaces, decorative curtain walls, shelves (boxes), outdoor air-conditioning components and accessories outside the main structure, column-free awnings with a width of less than 2. 10m and column-free awnings with a top cover height of two or more floors;

7 convex (floating) windows with the height difference between the window sill and the indoor floor below 0.45m, and the structural clear height below 2 2. 10/0m, and those with the height difference between the window sill and the indoor floor above 0.45m;

7. Outdoor ladders and outdoor special fire-fighting steel stairs;

8 sightseeing elevator without enclosure structure;

9. Underground civil air defense passages, independent chimneys, flues, trenches, oil (water) tanks, gas holders, water towers, oil (water) tanks, storage warehouses, trestle bridges and other structures outside buildings.

—— Excerpted from Code for Calculation of Building Area of Building Engineering, national standard,No. GB/T50353-20 13, and implemented since July, 2065438 1 day.