In building estimation, identify the item that is NOT included in the plinth area of a building measured at floor level to the outside of walls.

Introduction / Context:
Plinth area is the built-up covered area measured at floor level to the outside of walls. It is widely used for preliminary cost estimation and benchmarking across building projects. Correctly knowing what is included or excluded avoids inflated or understated cost projections at the concept stage.

Given Data / Assumptions:

• The plinth area includes all covered portions within the plinth outline as measured to outer wall faces.
• Ancillary vertical elements (lift wells, small shafts) inside the plinth are generally included per standard rules.
• Elements projecting beyond the plinth line may be excluded unless specifically stated otherwise by the measurement standard.

Concept / Approach:
Typical practice includes the thickness of walls, rooms, verandahs within the plinth, stair/lift cores, and internal shafts up to a limited area. A cantilevered porch that projects outside the plinth line is not part of the plinth area since it lies beyond the measured outer perimeter at floor level. It may be included in other area metrics (e.g., covered area) depending on the standard, but not in the strict plinth area if it is outside the plinth boundary.

Step-by-Step Solution:
Walls at floor level: included in plinth area → correct inclusion.Stair cover (mumty): a covered area over staircase, usually included in building area metrics → included.Sanitary shaft up to 2 sq.m: typically counted in plinth area → included.Lift well and landing within plinth: counted as they are covered structural areas → included.Cantilevered porch outside plinth line: excluded from plinth area → the “NOT included” item.

Verification / Alternative check:
Reference methods of measurement and public works handbooks distinguish between built-up/plinth area and projections beyond plinth lines. Porches that are cantilevered outside are not counted in plinth area.

Why Other Options Are Wrong:

• Options A–D represent covered areas within the building’s plinth and are typically included.

Common Pitfalls:
Confusing plinth area with carpet or built-up area definitions; accidentally including open or projecting elements beyond the plinth line.

Final Answer:
Area of a cantilevered porch projecting beyond the plinth line