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Bill of Quantities

When your groundworker's rate and your bricklayer's rate don't add up, the tender's already broken

Transparent pricing in construction isn't about showing the client more paperwork. It's about every trade in your tender being measured to the same standard, so the lines agree with each other before anyone starts asking questions.

Transparent pricing in construction starts with a question most tenders never get asked: do the trades agree with each other? You price the groundworks yourself on a Monday. Your quantity surveyor prices the superstructure on a Wednesday. Your subcontractor prices the M&E whenever it suits him. By the time it's all stitched together into one tender, nobody's checked whether the rates actually sit together sensibly. One trade's preliminaries are generous, another's are bare bones. One package includes waste and access, another assumes it's included elsewhere.

Nobody spotted it because nobody looked at the whole thing side by side. The client doesn't see the inconsistency either, until the job's running and one trade is haemorrhaging money while another is coining it. That's the real problem transparent pricing is meant to solve, and it has very little to do with how many pages you send.

Pricing built in pieces rarely agrees with itself

This isn't about any one person pricing badly. It's what happens when a tender gets built up in separate chunks, by separate people, on separate days, with no single measure holding it all together. Each piece can look fine on its own. Put next to the others, the assumptions don't match.

Take a hypothetical two-storey extension. The groundworker's price includes muck away. The bricklayer's price assumes the scaffold is already up. The roofer's price assumes it isn't and includes his own edge protection. Each price is honest. Put together, you've paid for edge protection twice and allowed nothing for the bricklayer's scaffold. The tender total looks sensible. The inside of it doesn't.

Multiply that across a bigger job with a dozen packages and you can see how a tender ends up with money in the wrong places. Some of it is double counted. Some of it isn't counted at all. The two errors can even roughly cancel out on paper, which is the worst outcome, because it hides both of them until the job's running and the costs land on the trades that were short.

What transparent pricing in construction actually means

It gets used loosely, so it's worth pinning down. A transparent price isn't one with more detail for the sake of it. It's one where anyone reading it can see what was measured, how much of it, and at what rate, and where those three things are consistent from one trade to the next.

That means a few things in practice:

  • One measurement standard. Every trade measured the same way, so a square metre in the brickwork section means the same thing as a square metre in the plastering section.
  • Stated inclusions. Waste, access, attendances and preliminaries dealt with once, in a known place, not silently baked into some rates and left out of others.
  • Quantities separate from rates. If the quantity is right and the rate is high, you can see it. If the rate is fine and the quantity is wrong, you can see that too.
  • A clear line to the drawings. Every item can be traced back to something shown on a drawing or written in the spec.

None of that is exotic. It's what a proper cost breakdown already does when it's built properly.

Measure the whole job to one standard

The fix is to measure the entire job to a single standard, in one pass, so every trade's quantities and rates come from the same basis. We measure the whole job to NRM2, so groundworks, structure, finishes and every trade in between are quantified the same way, at the same level of detail, with the same assumptions about what's included and what isn't.

That means when you look down your bill of quantities, the preliminaries allowance for one trade isn't wildly out of step with another, and nothing's been priced twice, or missed because two people each assumed the other had it.

It also changes how you use subcontractor prices. Instead of accepting a lump sum and hoping it covers the scope, you send each sub the same measured quantities and ask them to price against them. Now the prices come back on the same basis, and comparing two quotes becomes a matter of reading across a line rather than guessing what each one left out.

A tender that was measured once, to one standard, can be read line by line. A tender stitched together from separate prices can only be read as a total.

A tender that holds together under scrutiny

A client, or a main contractor above you, can pull any line in a bill built this way and it makes sense next to the line above and below it. That consistency is what stops a tender falling apart the moment someone starts asking questions.

It also protects you later. When a variation comes in, you've got an agreed quantity and rate to price the change against. When a valuation's disputed, you can point to the measured line rather than reconstructing what you meant months ago. Transparent pricing in construction isn't a favour to the client. It's the thing that lets you argue your own corner with evidence.

If you want to see what that looks like laid out, a consistent bill of quantities is the clearest example: every item measured, every rate visible, every trade on the same footing.

A quick test for your next tender

Before your next price goes out, pick any two trades and ask one question: where is scaffold, waste and access allowed for in each? If you can point to the answer for both, in the same way, your tender probably hangs together. If one answer is "it's in the rate somewhere" and the other is "I think the main contractor's providing it", you've found the crack, and it's much cheaper to fix now than on site.