How to Prepare a Plumbing BOQ for an Indian Project

A plumbing bill of quantities is the spine of every priced plumbing package. Get it wrong and the tender is unfair, the site runs on assumptions, and every running-account bill turns into an argument. This guide is a process reference for consultants, estimators and contract engineers: how to build a plumbing boq system by system, take off quantities cleanly, choose units correctly, and connect it to the tender and to the money that flows out on site.

This is a document-preparation guide, not a rate list. It carries no fabricated rates. All pricing is indicative — point rates to the plumbing cost guide and to current market or Schedule-of-Rates (SOR) figures for your state and year. Studio Matrx does not sell plumbing work.

What a plumbing BOQ actually is

A BOQ is an itemised, measured list of everything the plumbing scope requires — each item described, quantified in a defined unit, and given a rate so the priced total becomes the contract sum. It does three jobs at once:

• It is a specification-by-quantity: the description column tells the contractor exactly what to supply and install, referenced to the drawings and the approved material schedule.
• It is a tender instrument: bidders price the same items against the same quantities, so bids are comparable line for line.
• It is a measurement baseline: every running-account (RA) bill on site is measured against these same items and units, so payment tracks executed work.

Because the BOQ is read by estimators, contractors and clients alike, its structure must be unambiguous. For the technical "why" behind any item — pipe material, pump type, tank sizing — link out to the component pillars rather than re-explaining them here; the BOQ only names and counts.

Structure the BOQ by system

Never write a plumbing BOQ as one flat list. Group it into sections that mirror how the work is designed, built and inspected. A standard Indian project splits into five systems, each with its own sub-heading, running item numbers and sub-total:

• A — Water supply (internal): cold and hot supply piping, insulation, valves, fittings, and connection points to fixtures. Cross-reference the plumbing pipes guide for material calls.
• B — Soil, waste, drainage and vent: soil pipes, waste pipes, vent stacks, traps, floor and nahani traps, gullies, inspection and manhole chambers, external underground drainage.
• C — Rainwater harvesting and storm water: roof rainwater pipes, gutters, recharge pits or wells, filter chambers, storm drains.
• D — Sanitary fixtures and fittings: WCs, wash basins, sinks, urinals, health faucets, taps, mixers, and the concealed rough-in each connects to.
• E — Storage, pumping and treatment: underground sump, overhead tanks, transfer and booster pumps, level controllers, water treatment plant tie-ins.

This ordering is deliberate: it follows the flow of water into, through and out of the building, and it matches how site work is sequenced and how each trade is inspected before concealment.

Take off quantities from the drawings

Quantity take-off (QTO) is the measured extraction of every item from the tender drawings — plumbing layouts, riser diagrams, sanitary schedules and details. Work to a disciplined method so nothing is double-counted or dropped:

• Work system by system, floor by floor. Measure all of system A on every floor before moving to system B. This keeps your measurement sheet aligned to the BOQ sections and prevents cross-contamination between trades.
• Measure pipe runs to centre-line off the layout, then add vertical drops and risers from the riser diagram. Apply the drawing scale, or better, dimension strings where given. Keep a colour-marked print so every measured run is struck through.
• Count fixtures and specials from the sanitary schedule, not the layout — the schedule is the controlled list. Each WC, basin, floor trap, valve and cleanout is a counted number.
• Add an allowance for wastage and cutting at the rate build-up stage, not by inflating measured lengths — keep measured quantity and priced quantity conceptually separate.
• Record every measurement on a numbered take-off sheet with a reference to the drawing number and revision. This audit trail is what defends the quantity when a bidder or the client queries it.

Always take off against a drawing revision you name explicitly. When drawings are revised, re-measure only the affected items and re-issue the BOQ with an addendum — never quietly overwrite.

For material grades, sizes and IS references behind each measured item, keep the take-off tied to the plumbing material schedule so description and specification never drift apart.

Units and conventions

Using the correct unit for each item is what makes the BOQ measurable later. Indian plumbing BOQs follow a small, stable set of conventions:

• Running metre (Rm or m) — all piping, insulation, and any linear item measured along its run.
• Number (No / Nos) — fixtures, valves, traps, tanks, pumps, chambers, cleanouts, and every discrete unit.
• Square metre (Sqm) — sheet or area items such as tank waterproofing or lining where they fall in the plumbing scope.
• Lump sum (LS) — testing and commissioning, temporary works, and integrated items that cannot be sensibly broken down. Use LS sparingly; it is the least transparent unit and the hardest to measure for RA bills.
• Kilogram (Kg) — occasionally for structural pipe supports or fabricated brackets by weight.

Use this quick reference to keep units consistent across the whole BOQ:

State clearly, once, in the preamble whether piping rates are inclusive of fittings, supports, testing and concealment, or whether those are separate items — this single clarification prevents the most common tender dispute.

Rate build-up — how each item is priced

A BOQ rate is never a single guessed number; it is built up so it can be defended and adjusted. Each unit rate is the sum of five components:

• Material — the delivered cost of pipe, fittings, fixtures and consumables per unit, from current market or SOR rates.
• Labour — the plumber and helper time to install, tie, test and conceal, converted to a per-unit figure.
• Wastage — a percentage on material for cutting, offcuts and breakage, typically small for piping and near zero for counted fixtures.
• Overheads and profit — site establishment, supervision, tools, and the contractor's margin, as a percentage on the direct cost.
• Taxes and duties — GST and any statutory levy, shown per the tender's tax treatment.

Keep a separate rate-analysis sheet behind every non-trivial item so the make-up is traceable. When you publish the BOQ for tender, you can choose to expose only the final rate or the full analysis, depending on the procurement rules. For actual rupee figures, do not invent them here — draw from the plumbing cost guide and the current SOR, and for replacement-scope pricing see the pipe replacement cost guide.

The sample BOQ line-item table

This is the core deliverable — a plumbing BOQ template you can lift onto a project. Columns are item, description, unit, quantity and remarks. Rates are deliberately left to a priced copy: fill the rate column from current market or SOR figures at pricing time.

Every quantity above is illustrative — replace with your own take-off. Never carry another project's quantities into a new BOQ. The rate column is intentionally absent: price it from the cost guide and current SOR at tender stage.

How the BOQ links to the tender and RA bills

The BOQ is the connective document across the whole contract life-cycle:

• At tender: the BOQ becomes the priceable schedule. Bidders enter rates against your quantities; the priced BOQ is compared, negotiated and finally forms part of the executed contract as the agreed schedule of rates.
• During execution: site-measured work is billed against the same item numbers and units. Each RA bill certifies the quantity actually executed to date times the contract rate, less previous bills — which only works if the BOQ units are measurable.
• On variation: extra or changed work is priced using the BOQ rates where the item exists, or by fresh rate analysis where it does not — the original rate-analysis sheets make this defensible.
• At final account: the closed-out BOQ, re-measured, reconciles the contract sum against what was built.

A clean BOQ is measurable twice: once by the bidder to price it, and again by the site engineer to bill it. If an item cannot be measured on site, it does not belong as a lump sum — break it down.

For the wider toolkit — checklists, schedules, drawing standards and tender templates — this guide sits under the plumbing professional resources hub.

Copy-ready BOQ preparation checklist

Lift this straight onto your next project:

• Confirm the tender drawing set and revision; name the revision on every take-off sheet.
• Split the BOQ into sections A-E by system, plus a testing and commissioning section.
• Take off system by system, floor by floor; strike through every measured run on a marked print.
• Count fixtures and specials from the sanitary schedule, not the layout.
• Assign the correct unit to each item: Rm for piping, No for counted items, LS only where unavoidable.
• State inclusions in the preamble (fittings, supports, testing, concealment) once and unambiguously.
• Build each rate from material + labour + wastage + overhead + tax; keep a rate-analysis sheet.
• Point all rupee figures to the cost guide and current SOR — invent nothing.
• Tie descriptions to the material schedule so spec and quantity never drift.
• Issue with numbered items and section sub-totals so the same document can be priced and later billed.