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Preliminary estimate: 4-storey office, cube rate

Short answer

Volume = 6,772.73 m³; civil cost at Rs250/m³ = Rs1,693,181.82. Adding 1% architecture,6% water,6% sanitary,8% electrification,5% contingency,3% supervision yields total Rs2,212,650.

Prepare a preliminary estimate of the four storied office building having carpet area of 250 m² per story. The height of each story is 3.5 m and on the roof floor there is parapet wall of 0.90 m height. The cube rate of the building in that locality is Rs. 250/cu.m. Take 10% built up area is covered by walls and 35% by circulation purposes. Assume other necessary suitable provisions.

Plinth area and volume

Total carpet area = 4 x 250 = 1000 m².

Total plinth area=10001−0.10−0.35=1,818.18 m2\text{Total plinth area} = \frac{1000}{1 - 0.10 - 0.35} = 1,818.18\ \text{m}^2

Plinth area per storey = 1,818.18 / 4 = 454.55 m².

Height = 4 x 3.5 + 0.90 (parapet) = 14.9 m, so volume = 454.55 x 14.9 = 6,772.73 m³.

Estimate

The cube rate is used as printed (Rs 250/m³). The provisions for architecture 1%, water supply 6%, sanitary 6%, electrification 8%, contingency 5% and supervision 3% are assumed.

ItemBasisAmount (Rs)
Civil cost (volume x cube rate)6,772.73 m³ x 2501,693,181.82
Architectural treatment (assumed)1% of civil cost16,931.82
Water supply (assumed)6% of civil cost101,590.91
Sanitary work (assumed)6% of civil cost101,590.91
Electrification (assumed)8% of civil cost135,454.55
Total building cost2,048,750.00
Contingency (assumed)5% of 2,048,750102,437.50
Supervision charge (assumed)3% of 2,048,75061,462.50
Total estimated cost2,212,650.00

Answer: Volume = 6,772.73 m³; total estimated cost = Rs 2,212,650.00. If the rate is in fact Rs 2,500/m³, every amount is ten times larger.

✓ Answer checked by Claude Opus 5.5 (high effort)

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