NirmanShastra — India’s first IS-code construction cost estimation and professional BOQ generation platform
A "₹1,800 per sq ft" quote sounds simple. It is actually the most effective way to conceal material substitution and quantity fraud. Here is what the number hides — and what to demand instead.
"₹1,800 per square foot — all inclusive." It sounds clean, predictable, and easy to compare. You multiply by your floor area, get a total, and decide. Three contractors give you three numbers; you pick the lowest.
This is exactly the outcome a corner-cutting contractor wants. The per-sqft rate is a black box. It conceals every material substitution, every under-delivery, every shortcut — because there's nothing to check. You have no idea whether that ₹1,800 includes M20 or M15 concrete, 16mm or 12mm rebar, or whether the plumbing is CPVC or the cheapest PVC available.
Every construction project has a Bill of Quantities (BOQ) — a line-by-line breakdown of every material, its quantity, its rate, and its IS specification. A legitimate builder's BOQ has 80–150 line items. Per-sqft pricing collapses all of this into a single number.
The mathematics of fraud: if a contractor substitutes M15 for M20 concrete (cheaper by about 12%), uses 10mm rebar where the drawing calls for 12mm (saves 30% on steel weight), and uses 4.5" brick walls where you expected 9" (saves 40% on masonry), the savings to the contractor on a 1,000 sq ft house could be ₹3–5 lakh — while the invoice still says ₹1,800/sqft.
You won't know until the plaster starts cracking in year 3, the steel rusts in year 8, or the structure cracks in the first moderate earthquake.
IS 456:2000, IS 1786:2008, IS 1077:1992, and IS 732:2019 don't give you a per-sqft rate. They give you a quantity for every specific element. A properly specified construction contract lists:
Without these specifications in writing, signed before work begins, you have no recourse when substandard materials arrive.
Before signing any construction contract:
1. Ask for a BOQ, not a rate. A contractor who refuses to provide a line-item BOQ is hiding something. This is non-negotiable.
2. Specify IS codes for every major material. Concrete grade per IS 456, steel grade per IS 1786, bricks per IS 1077, pipes per IS 4985 (CPVC) or IS 4669 (UPVC).
3. Get independent quantity verification. A structural engineer or quantity surveyor can verify the BOQ against approved drawings. The fee is typically ₹5,000–15,000 — cheap against the exposure of a ₹50 lakh contract.
4. Use NirmanShastra to generate your own BOQ baseline. StructurePro produces an IS 456:2000 compliant structural BOQ for your specific floor area and zone. Place it beside the contractor's quote and look for gaps.
Instead of comparing ₹1,800/sqft vs ₹2,100/sqft, compare:
Now you are comparing like for like. The second quote might be worth every rupee.
*Generate your own IS-code based BOQ with StructurePro — so you can compare contractor quotes on equal terms.*