Estimating and Costing
The plinth area of a building not includes

Area of cantilevered porch
Area of the walls at the floor level
Internal shaft for sanitary installations up to 2 sq m. in area
Lift and wall including landing

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Estimating and Costing
In the mid-section formula

All of these
The volume of the earth work is calculated by multiplying the mid-section area by the distance between the two original sections
The area of mid-sections is calculated by using mean depth
The mean depth is the average of depths of two consecutive sections

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