How to Prepare a BOQ from Drawings: A Step-by-Step Guide for Indian Projects

A bill of quantities is the document that turns a drawing into money. Every dispute you will ever have about a construction bill — every "yeh quantity kahan se aayi?" at a billing meeting — traces back to how the BOQ was prepared. Yet most engineers learn BOQ preparation by inheriting someone else's spreadsheet, and most tutorials online are written for American or UK conventions that no Indian client, PMC, or government department actually uses.

This guide walks through the full workflow from a drawing set to a tender-ready BOQ, the way it is done on Indian projects: IS 1200 measurement conventions, L×B×D measurement sheets, the deduction rules that separate a defensible bill from a disputed one, and the abstract that turns quantities into a contract value.

What a BOQ is — and what it is not#

A bill of quantities (BOQ) is an itemised list of every work item in a project, each with a description, a unit of measurement, a measured quantity, a rate, and an amount. Its job is to let multiple contractors price identical scope, and later, to let both parties bill against measured work rather than lump-sum guesswork.

It is worth separating three documents that get conflated:

A ₹/sqft calculator output is an estimate. A BOQ is a measured document — every quantity in it should be traceable to a dimension on a drawing. That traceability is the whole point, and it is what this workflow produces.

Step 1: Assemble the right drawing set#

You cannot measure what is not drawn. Before opening a spreadsheet, confirm you have:

• Architectural drawings — floor plans, elevations, sections, door-window schedule, finish schedule.
• Structural drawings — footing layout, column schedule, beam and slab details, and the bar bending schedules if issued.
• The latest revision. Check the revision block on every sheet. Measuring from a superseded drawing is the most expensive mistake in this entire process, because every downstream quantity inherits the error.

The gold standard is a GFC (Good For Construction) set — drawings formally released for execution. Tender drawings work too, but note your assumptions in the BOQ wherever detail is missing (for example, "lintel depth assumed 150 mm, to be confirmed from GFC"). An honest assumptions list protects you far better than silent guesses.

If MEP scope is included, you also need electrical layouts, plumbing and drainage drawings, and fixture schedules — but most civil BOQs are prepared first and services follow as separate bills.

Step 2: Understand the measurement rules before you measure#

India measures construction work per IS 1200, a family of standards with separate parts for each trade (Part 1 for earthwork, Part 2 for concrete, Part 3 for brickwork, Part 12 for plastering, and so on). You do not need to memorise all of it, but a handful of rules do most of the work in practice:

• Units are fixed by trade. Earthwork, concrete, and masonry are measured in cubic metres (cum). Plaster, flooring, formwork, and painting in square metres (sqm). Reinforcement in kilograms or tonnes. Beading, skirting, and pipes in running metres (RMT). Using sqft in a formal BOQ is acceptable for private residential clients, but government and institutional work expects SI units — mixing the two inside one bill is how arithmetic errors hide.
• Deductions have thresholds. This is the rule thumb-rule calculators and generic AI tools always miss. In plastering, openings up to 0.5 sqm are ignored — no deduction — because the labour of working around a small opening offsets the saved material. Openings larger than 0.5 sqm are deducted (with jambs, sills and soffits measured separately where plastered). Brickwork has its own deduction rules for openings, bearings, and embedded members.
• Degree of accuracy is specified. Dimensions are recorded to 0.01 m, areas to 0.01 sqm, and volumes to 0.01 cum. Steel is computed at 7850 kg per cum, which is where the familiar d²/162 formula for bar weight per metre comes from.
• Work is measured net, in its finished position. Wastage, laps, and bulking belong in the rate, not in the quantity — a BOQ that inflates quantities "to cover wastage" will be torn apart at billing.

If you do serious estimation work, keep the relevant IS 1200 parts at your desk. Our guide to IS codes every site engineer actually uses covers where they fit in the wider code landscape.

Step 3: Take off quantities on a measurement sheet — never directly into the BOQ#

The single discipline that separates professional BOQ preparation from spreadsheet guesswork is this: quantities are computed on a measurement sheet (taking-off sheet), and the BOQ only receives the totals.

A measurement sheet records, for every member:

So twelve F1 footings excavated at 1.50 × 1.50 × 1.50 m appear as one line — 12 × 1.5 × 1.5 × 1.5 = 40.50 cum — with "SD-02" in the reference column. Deductions appear as negative lines on the same sheet: four W1 windows deducted from internal plaster as −4 × 1.20 × 1.35 = −6.48 sqm, with the note "opening greater than 0.5 sqm, full deduction per IS 1200".

Why insist on this? Because six months later, when the client's engineer challenges the plaster quantity, you do not re-derive anything — you open the measurement sheet, point at the line, and point at the drawing. The measurement sheet is the audit trail. It is the same L×B×D format used for joint measurement sheets and RA billing during execution, so a BOQ prepared this way flows naturally into the billing cycle.

A practical measuring sequence that avoids double-counting: work in construction order — earthwork, PCC, footings, columns to plinth, plinth beams, superstructure columns and beams, slabs, masonry, lintels, plaster, flooring, finishes. Within each trade, sweep the drawing grid line by grid line (A1, A2, A3...) so every member is visited exactly once.

Step 4: Write item descriptions a stranger can price#

Each BOQ item is a small contract. A contractor who has never seen your project should be able to read the description and price it. That means every description carries:

• The material and grade — "RCC M25", "class-A brick in CM 1:6", "TMT Fe500D".
• The location or element — "in isolated footings", "in superstructure, 230 mm thick".
• What is included — "including formwork", "including scaffolding", "including binding wire".
• What is excluded — "excluding reinforcement" (measured separately in kg).

Compare "Concrete for footing — 12.38 cum" with "Providing and laying RCC M25 in isolated footings including formwork, excluding reinforcement — 12.38 cum". The first invites a dispute about whether shuttering was in the rate; the second settles it before it starts. When in doubt, borrow phrasing from CPWD or your state PWD schedule of rates — their item descriptions have been litigated for decades and are precise for exactly that reason.

Group items into trade sections (earthwork, concrete, reinforcement, masonry, finishes), number them hierarchically (A.1, A.2... B.1, B.2...), and subtotal each section. Structure is not cosmetic — it lets a contractor price sections independently and lets you spot a missing trade at a glance.

Step 5: Apply rates — DSR, market, or both#

With quantities and descriptions fixed, pricing is a separate decision:

• DSR / SOR rates. CPWD's Delhi Schedule of Rates and each state PWD's schedule give government-notified rates per standard item. Use these for government tenders, institutional work, and rate justification. They lag the market, so private work priced purely on DSR will look odd in both directions.
• Market rates. Built from current material quotes and local labour rates through a rate analysis — the build-up of material coefficients, labour, tools and plant (2.5–3% of labour), water charges, and contractor overheads and profit (10–15%). Our rate analysis guide walks through the arithmetic item by item.
• Quantities-only BOQ. For competitive tendering, issue the BOQ with quantities and blank rate columns and let bidders price it. This is exactly what the tender process is designed around.

Whichever basis you choose, state it on the BOQ. "Rates as per DSR 2025 with 5% cost index" or "market rates, Jaipur, August 2026" — an undated, unattributed rate column is a negotiation you will lose.

Step 6: Build the abstract — subtotals, contingency, GST#

The abstract of cost is the summary page decision-makers actually read:

1. Section subtotals carried from the BOQ.
2. Project sub-total.
3. Contingency — typically 3–5% on works, covering the genuinely unforeseeable, not sloppy measurement.
4. GST — construction services attract 18% in most private works contracts; check the current position for your contract type rather than assuming.
5. Grand total.

Keep contingency and tax in the abstract only. Burying them inside item rates makes every rate impossible to benchmark and every variation impossible to price cleanly.

Step 7: Check the BOQ before it leaves your desk#

A one-hour check protects you from months of arguments. The checks that catch the most errors:

• Cross-quantity sanity. Formwork area should be consistent with concrete volume; reinforcement should land in a sane kg-per-cum band for the element type (roughly 80 kg/cum for footings up to 150+ kg/cum for columns — big deviations mean a takeoff error, not an unusual design). Plaster area should roughly track 2× wall area minus openings.
• Completeness sweep. Walk the finish schedule and the door-window schedule line by line — finishes and openings are the most commonly missed items, because they live on schedules rather than plans.
• Unit audit. Every unit against IS 1200 conventions; every formula in the sheet spot-checked at the extremes (largest and smallest members).
• Deduction audit. Every opening above 0.5 sqm deducted from plaster and masonry; nothing below the threshold deducted.

The honest cost of doing this well — and the shortcuts that exist#

Done properly, a full takeoff and BOQ for a 1,200–2,000 sqft residence takes an experienced engineer two to four full days; a mid-size commercial building takes one to two weeks. That time is exactly why a whole industry of shortcuts exists:

• ₹/sqft calculators skip measurement entirely — useful for a first budget conversation, useless for tendering or billing.
• Manual BOQ services charge ₹10,000 upwards and take days, with quality that depends entirely on who happens to do the takeoff.
• Generic AI chatbots will happily produce a BOQ-shaped table, but they do not measure your drawing, they do not know IS 1200 deduction thresholds, and they invent rates. We have written separately about what ChatGPT actually gets wrong in quantity takeoff.

Our own answer is a pipeline where AI performs the measurement from your actual drawing and an engineer verifies every sheet before it goes out — you can send one GFC drawing and get a measured BOQ back within 48 hours, free for your first project. Every quantity arrives with the L×B×D measurement sheet behind it, which means you can check our work the same way you would check your own.

And if you would rather build the documents yourself, the free Indian QS Starter Kit bundles the four Excel formats this guide describes — BOQ format, L×B×D measurement sheet, CPWD-style rate analysis, and bar bending schedule — with worked sample rows.

FAQs#

Can I prepare a BOQ from tender drawings, or do I need GFC?#

You can and routinely will prepare BOQs from tender drawings — that is what tendering is. The difference is disclosure: where the tender set lacks detail, state your assumption against the item. When the GFC set arrives, reconcile quantities against those assumptions and process the differences as variations.

What is the difference between a measurement sheet and the BOQ?#

The measurement sheet holds the working — member-wise Nos × L × B × D calculations with drawing references, including negative deduction lines. The BOQ holds only each item's total quantity, description, unit, rate, and amount. Skipping the measurement sheet does not save time; it just moves the time to billing-stage disputes.

How do I calculate quantity from a drawing if the dimension is not marked?#

Scale it as a last resort, and flag it. Measure against the drawing's stated scale or a known dimension (a 230 mm wall, a 900 mm door), record "scaled, to be confirmed" in the remarks, and get the dimension confirmed before execution. Never silently scale critical structural dimensions.

What percentage do I add for wastage in a BOQ?#

None — in the quantities. IS 1200 measures net work in its finished position. Wastage, laps, and breakage belong in the rate build-up (steel rates typically carry 2–5% for laps and offcuts, tiles 5–10% for cutting). Inflating quantities to cover wastage is the fastest way to lose a billing argument.

Which unit should I use — sqft or sqm?#

Follow your client. Government and institutional work expects SI units per IS 1200 (cum, sqm, RMT, kg). Private residential clients think in sqft, and it is fine to bill them that way — but pick one system for the whole BOQ and state it. The conversion errors live at the boundary between the two.