Your answer to your query lies in rule 3 of the Building and Other Construction Workers Welfare Cess Act, 1998, where the cost of construction is stated as:
Levy of Cess
"For the purpose of levy of cess under sub-section (1) of section 3 of the Act, the cost of construction shall include all expenditure incurred by an employer in connection with the building or other construction work but shall not include:
- Cost of land;
- Any compensation paid or payable to a worker or his kin under the Workmen's Compensation Act, 1923."
Therefore, I feel that whichever becomes an immovable part of the construction, like doors, windows, grills, wiring, sewerage, water and conduit pipes, bulb holders, electric switches, taps, toilet seats, washbasins, bathtubs, paints, etc., should be included in the cost of construction. However, the tubes, bulbs, air conditioners, inverters, movable almirahs, tables, chairs, and furniture, etc., can be excluded.