The moment to bring in an external estimator is not when your business hits a certain size. It is when you start turning down tenders because you have not got the evening to price them. That is the point where estimating stops being an overhead and starts being a cap on what you can win.
Most builders get to that point months before they notice it, because a tender you never bid does not show up anywhere. It is not a loss. It is not a low margin job. It is just an email you did not answer, and there is no line in your accounts for those.
The signal that matters most
Count the tenders you turned down in the last twelve months for no reason other than time. Not the ones outside your trade, or in the wrong part of the country, or from a client you would not work for again. Just the ones you would have bid if the day had been longer.
If that number is more than a handful, an external estimator is not a cost decision. It is a capacity decision, and the arithmetic is not close.
What a declined tender actually costs
Round figures, using the same assumptions as our article on what outsourced estimating costs, so the two are directly comparable. Swap in your own.
- You turned down 8 tenders last year purely for lack of time
- You win one in four of what you bid, so those eight were worth two jobs
- Average contract value is £85,000
- Your net margin is 12%, so £10,200 a job
Two jobs at £10,200 is £20,400 of margin you never went after. Pricing all eight externally at £150 each would have cost £1,200.
So the choice was £1,200 of fees against £20,400 of margin you did not chase, and that is before you count the client who stopped sending you invitations because you kept saying no. Tender lists are shorter than most builders assume, and coming off one is easier than getting back on it.
Five other signs it is time
- You are pricing after nine at night. Tired estimating is where missed items come from, and a missed item on a job you win costs far more than the estimate ever would.
- Your win rate has drifted down without your prices changing. Often this is not price. It is thinner submissions going out under time pressure.
- You are pricing by comparison rather than by measure. "It is like that one we did in the spring" works until the one it is like was priced the same way.
- A job went wrong and you could not work out where. If the estimate was a lump sum per trade, there is nothing to interrogate afterwards.
- You have started declining work you would enjoy. That is the clearest signal of the lot, and the one people ignore longest.
What you should keep in-house
Outsourcing estimating does not mean handing over pricing decisions, and any firm that suggests otherwise is overselling.
What comes back is a measured, priced document. What you do with it stays yours: the margin you carry, whether you want the job badly enough to sharpen it, which subbies you would actually use, what you know about the client's payment record. Nobody outside your business can price that in, and nobody should try.
The split works because the two halves need different things. Measuring and pricing needs time, software and consistency. Deciding what to submit needs judgement about your business. Handing over the first does not touch the second.
How the handover actually works
The first time is the only one with any friction, and less than people expect.
You send the drawings, ideally as a OneDrive or Dropbox link so nothing is lost to email attachment limits. Scope and turnaround get confirmed along with a fixed fee, before any work starts. The works are measured and priced, and the estimate comes back with a schedule of assumptions setting out exactly what has been allowed and what has not.
Read the assumptions first. That is where you will find the questions worth raising with the client, and it is the part of the document most people skip. Everything is measured to a recognised standard, which in the UK means the RICS new rules of measurement and in Australia and New Zealand means ANZSMM. That matters more than it sounds, because it is what lets a second person check the first person's measure.
Bid more, or bid better?
Freeing up the evenings gives you a choice, and it is worth making it deliberately rather than drifting into one.
Bidding more is the obvious move. If you were pricing 24 tenders and you can now price 32, the same hit rate gives you two more jobs a year. That works while there is genuinely more work to chase and your delivery capacity can absorb it.
Bidding better is often worth more and gets chosen less. The same eight tenders, priced properly, with the temporary works found, the preliminaries built from the programme and a schedule of qualifications on the front, wins at a higher rate and loses money less often. A win rate that moves from one in four to one in three is worth more than four extra submissions, and it costs nothing extra in fees.
Most firms need the second before the first. If your last three jobs came in tighter than you priced them, more volume just repeats the error faster.
What happens when the drawings change
They will. Revisions midway through a tender period are normal, not an exception, and how a firm handles them tells you more about working with them than their price does.
Ask before you commit. A revision that changes the scope is different from one that corrects a dimension, and the two should not be treated the same way. The answer you want is a clear rule agreed up front, not a conversation about it afterwards.
When not to outsource
There are cases where it is genuinely the wrong call, and it is worth being straight about them.
If you price two or three jobs a year, the habit will not stick and you will get more from spending an afternoon on your own rate library. If your work is highly repetitive and you already have a spreadsheet that reflects real outturn costs, an external measure adds less. And if the reason your estimates are wrong is that your rates are wrong rather than your quantities, outsourcing the measure fixes the wrong end of the problem. Better measurement of bad rates gives you a more precise wrong answer.
At sustained volume, an in-house estimator eventually wins on cost. The break-even is a volume question rather than a size question, and we have set out how to work it out in the costs article.
Who this tends to suit
- Builders
- Main contractors
- Subcontractors
- Specialist trades
- Developers
FAQ
When should I use an external estimator? When you are turning down tenders for lack of time, pricing late at night, or winning less without having changed your prices. The trigger is capacity rather than company size. Plenty of two-person firms outsource estimating and plenty of larger ones never need to.
Do I lose control of my pricing? No. You get a measured, priced document with the assumptions set out. Margin, whether to bid at all, and how keen to be on a particular client stay entirely with you. Those are business decisions, not measurement ones.
How much notice do you need? Send the drawings as soon as the invitation lands rather than the week the tender is due. Turnaround is confirmed with the fee before work starts, so you will know immediately whether the deadline is achievable.
What if I only need part of it priced? That is common. A takeoff on its own, a single trade package, or a check on a price you have already built up are all normal requests. Say which you want when you send the drawings.
Will an external estimator know my subbies' rates? Not initially. Rates come from benchmark data developed over years of contractor feedback, adjusted for location and project type. Send us your own rates for the trades where you have firm prices and they get used instead.
Where to start
Pick the next tender you would otherwise turn down and send that one. It is a low-risk way to find out whether the process fits how you work, and it costs you a fee you were never going to earn anything on anyway. Send the drawings and you will have a fixed fee and a turnaround date before you commit. If you would rather hand over the whole pricing job, that is tender pricing for contractors.