A bill of quantities is the building written out as a list.
Every item that has to be built is measured off the drawing set that exists on the day. Each item is described in the words the trade uses. Each one is set against a unit and a quantity. Nothing is scaled off a floor area.
That is the whole document. People search for the bill of quantities meaning and get a paragraph of procurement language back. The plain version is the one above, and everything below is detail hanging off it.
What BOQ stands for
BOQ is bill of quantities. You will also see BoQ and bill of quants on site. They are the same document. In Australia it turns up in tender documentation as a priced bill, a returnable schedule or simply the bill, and none of those names change what is in it.
The word bill is the old sense of the word, meaning a list, not an invoice. Nobody is being charged anything. It lists the work.
What is actually inside one
A bill is not a spreadsheet of totals with a cover sheet. A usable one is built so an estimator can price straight into it without unpicking it first. The version we hand over carries six things:
- The issued drawing set and specifications as the stated basis
- Measurement trade by trade, taken against the geometry
- A structured trade summary
- Clear breakups within each trade
- Returnable pricing schedules
- Clarification notes against the set
Every one of those exists for the same reason the document does. Somebody downstream has to read it and price it without ringing you to ask what a line means.
The unit is the part people skip
An item without a unit is an opinion. Concrete is measured in cubic metres, formwork in square metres, reinforcement in tonnes, doors in numbers, skirting in linear metres. When the unit is right, two estimators pricing the same line are pricing the same thing, and the two prices can be compared.
When the unit is wrong, or missing, the comparison quietly stops working. That is why a bill is worth more than a list of items, and why the measure has to come before anybody puts a rate against it.
What it is measured from
The set that exists on the day. Not the set that is coming, not the one from the last revision, and not the finished building.
This matters more than it sounds. A bill is a snapshot of a design at a moment, and the moment is stated on the front of it. When the set is reissued, the bill is re-measured against the addendum rather than quietly adjusted, so anybody reading it later can tell which drawings the number came from.
A bill measures what is drawn. It does not measure what is missing.
The limit of the document
That second sentence is why every bill we issue goes out with clarification notes attached. The gaps are part of the delivery. Leaving them out makes the document look more finished and makes it worth less.
Bill of quantities versus estimate
A bill measures and describes the work. An estimate puts a price against it. They are different documents with different jobs, and a job that needs one usually needs the other soon after.
The short version: the bill answers how much of everything there is, and the estimate answers what it costs. If you want them set out properly next to a trade takeoff as well, that is takeoff, estimate or bill of quantities.
Who asks for one, and why
Three readers, three reasons.
A builder pricing a tender wants every trade written out before a rate goes on anything, so the bid is built from the building rather than from a feeling about the building.
A developer or client wants the scope on paper before anyone prices it, because a scope that only exists in drawings is a scope that every bidder interprets differently.
A project team running a competitive tender wants one bill issued to every builder, so the bids can be read against each other. Without that, you are comparing three different buildings and calling it a tender analysis.
When you do not need one
If you are a subcontractor pricing one package, you do not need the whole building measured. You need that package measured on its own, with the boundary of the scope written down before the first quantity.
If the design is still moving and the question is what the building should be rather than what it costs to build as drawn, a bill is premature. That stage wants a cost plan, priced by element, updated at each issue.
And if there is barely anything drawn, the honest document is an early budget benchmarked against comparable work, stated as a comparison. Anything else is a guess wearing a document's clothes.
How long it takes and what to send
Ten business days is the typical run on a full measure, drawings in to bill out.
To start we want the issued drawing set, the specifications and the tender date. If there are consultant reports, an RFT or contract documents, send those too. They get read in stage one, before measurement begins, because the fastest way to waste a week is to measure a set nobody has read properly.
How a bill is set out
The order is not decorative. A bill is read under time pressure by somebody who did not write it, so it is arranged the way the job will be let.
Trades come first, because packages get sent out by trade. Inside each trade the items follow the sequence the work happens in, which means an estimator pricing the concrete is not jumping between three sections to find it. The trade summary sits on top so a reader can see the shape of the job before the detail, and the returnable schedules sit at the back so the priced version comes home in a format the client's team can compare.
Breakups are the part people underestimate. A trade with no internal structure is a number nobody can interrogate. A trade broken up properly lets you see where the money is inside it, which is the difference between knowing a bid is high and knowing why.
Design and construct changes what the bill has to do
On a lump sum job the documents are meant to have settled the argument before anybody prices it. On design and construct they have not, and the builder carries whatever the drawings left open.
So on a D&C bill the breakups are structured for the way that builder prices risk, and the assumptions are written into the document rather than left in somebody's head. A bill that quietly assumes its way past a gap is worse than no bill on a D&C bid, because it hands over a number that looks complete and is not.
That is how Barwon Heads Golf Club was measured: a $20M–$30M design and construct clubhouse, with risks and scope gaps flagged early and the trade breakups built for D&C pricing.
Why the document survives
The bill has been doing this job for more than two hundred years, which I have written about before. The tools changed. The format changed. The purpose did not: clarity, accountability, and a common language between client, consultant and contractor.
Clarity means the scope is written down before anyone puts a rate against it. Accountability means every party can point at the same line and mean the same thing by it. A common language means the bids can be compared at all.
That is all a bill of quantities is. It is not complicated, and it is not optional if you want to know what you are pricing.