Estimating and Costing
The plinth area of a building not includes

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

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Estimating and Costing
The assumption on which the trapezoidal formula for volumes is based, is

The end sections are parallel planes
The mid-area of a pyramid is half the average area of the ends
The volume of the Prismoidal is over-estimated and hence a Prismoidal correction is applied
All listed here

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