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Preliminary estimate: 4-storied office, 2000 m²

Short answer

Plinth area = 2000/(1−0.3−0.1) = 3333.33 m². Building cost = 3333.33 × 15000 = Rs 50,000,000; adding architectural (1.5%), electric (8%), other services (5%) gives total building cost Rs 57,250,000; after 5% contingency and 5% supervision, final estimate = Rs 62,975,000.

Prepare a preliminary estimate of a 4 storied office building having a total carpet area of 2000 m² for obtaining the administrative approval of the ministry. Given the following data:

  • 30% built up area will be taken up by corridors, verandah, toilets, staircase etc.
  • 10% of built-up area will be occupied by walls
  • Plinth area rate is Rs. 15000/m²
  • Extra for special architecture treatment 1.5% of the building cost
  • Extra for electric installation 8% of the building cost
  • Extra for other services 5% of the building cost
  • Contingencies 5% of the total building cost
  • Supervision charge 5% of the total building cost

Method

Plinth (built-up) area is found from the carpet area, as the carpet area is what remains after the circulation (30%) and wall (10%) areas are removed:

Plinth area=20001−0.30−0.10=20000.60=3333.33 m2\text{Plinth area} = \frac{2000}{1 - 0.30 - 0.10} = \frac{2000}{0.60} = 3333.33\ \text{m}^2

This is the total plinth area of all 4 floors (833.33 m² per floor).

Calculation

ItemBasisAmount (Rs)
Building cost3333.33 m² x 15,00050,000,000
Special architectural treatment1.5% of 50,000,000750,000
Electric installation8%4,000,000
Other services5%2,500,000
Total building cost57,250,000
Contingencies5% of 57,250,0002,862,500
Supervision charge5% of 57,250,0002,862,500
Total estimated cost62,975,000

Answer: Plinth area = 3333.33 m²; total estimated cost = Rs 62,975,000 (about Rs 6.30 crore).

Contingency and supervision are taken on the total building cost (Rs 57,250,000) as given in the question.

✓ Answer checked by Claude Opus 5.5 (high effort)

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