BOQ vs BOM — Indian estimators keep mixing these up, and it costs money

Two three-letter words that sound the same, get used interchangeably on half the sites in India, and quietly cost estimators money when they're confused: BOQ and BOM. One is what you sell to the client. The other is what you buy from the vendor. Mix them up and you either under-order material or under-price the job — sometimes both on the same project. Here's the difference, in plain terms.

BOQ vs BOM — the difference in one line

BOQ (Bill of Quantities) is your priced scope of work — the items, the measured quantities and the rates you quote the client. BOM (Bill of Materials) is the physical list of materials you must actually buy to execute that work. The BOQ is a commercial document; the BOM is a procurement document.

• BOQ line: “RCC M25 in slab — 42 cu.m @ ₹X per cu.m.” That's what the client pays for.
• BOM behind it: the cement, sand, 20mm and 10mm aggregate, and the TMT steel (by diameter) needed to pour those 42 cubic metres. That's what you order.

Same wall, two different documents, two different audiences. The client never sees your BOM; the steel vendor never sees your BOQ rate.

Where the money leaks: treating one as the other

The expensive mistake is procuring straight off the BOQ. A BOQ says “42 cu.m of M25 concrete” — it does not say how many bags of cement or how many kilograms of 12mm TMT that needs. If you hand that to your store or your vendor, someone guesses the material, and a guess on a slab pour is money.

Going the other way is just as bad: pricing the job off a materials list. Your BOM tells you what to buy, but it doesn't carry your labour, your overhead, your margin or the client's agreed item rates. Quote off the BOM and you've sold a job at cost.

The BOQ tells you what you're owed. The BOM tells you what to buy. Confuse them and you'll either under-order the steel or under-price the slab — and both mistakes come out of your margin.

The bridge between them: the rate analysis

A BOQ item converts into a BOM through rate analysis — the coefficients that say how much of each material one unit of work consumes. One cubic metre of M25 needs roughly so many bags of cement, so much sand and aggregate; one metre of a 12mm bar weighs 0.888 kg(from the d² ÷ 162.2 rule). Multiply the BOQ quantities by those coefficients and the BOM writes itself. Skip this step and you're back to guessing.

This is also where the two documents keep each other honest. If your BOM material cost creeps above the rate you quoted in the BOQ, you can see the margin evaporating before you place the order — not after, when the tempo of TMT has already been dumped at site.

Getting it right without a spreadsheet full of formulas

The manual version of this — one Excel file for the client BOQ, another for the material take-off, and a prayer that they stay in sync — is where errors breed. Change a BOQ quantity and the BOM should update; in a spreadsheet it usually doesn't.

Rebaar keeps the BOQ (priced, client-facing, built from your rate library) and the material take-off connected, so a change in scope flows through to what you procure — and 3-way match ties the eventual vendor bill back to the PO and the goods received. The client's BOQ and your buying list stop drifting apart.

Build a BOQ that actually tells you what to buy. Start free → or explore estimating & procurement.