You hand a job over to be taken off, and what should come back is quantities you can actually price against. Not a rough guess with a tidy cover page. So it's fair to ask what happens in between, and this is the quantity takeoff step by step, the way we run it on every job.
None of it is secret. It's just discipline: doing the dull parts properly, in the same order, every time. Most of the errors that end up costing contractors money come from skipping one of the steps below, usually the first or the third.
Step one: read the drawings before anything gets measured
Every takeoff starts with going through the full set properly. Which drawings have you actually got? Plans, sections, elevations, details, schedules, the specification. Then which revision is current, because it's surprisingly common to receive a set where the plans are on one revision and the sections on an older one.
After that comes the cross-checking. Does the specification match what's drawn? Does the window schedule agree with the elevations? Where two sheets contradict each other, which one wins?
Skip this and you end up measuring the wrong thing confidently, which is worse than measuring the right thing badly. A wrong revision can be perfectly measured and still give you a useless number.
One more check belongs here: scale. PDF drawings get printed, reduced and re-saved, and a sheet marked 1:100 isn't always 1:100 by the time it reaches you. Checking a known dimension against the scale before measuring anything is a two-minute job that saves a lot of pain. Any quantity takeoff step by step that leaves this out is taking a chance on every number that follows.
Step two: measure element by element, to NRM2
Once the drawings are settled, every element gets measured on its own. Substructure, frame, upper floors, roof, external walls, windows and doors, internal walls, finishes, fittings, services, external works. Measured to NRM2 so the order is consistent and recognised, not organised around whatever caught the eye first on the page.
Each item gets measured in the unit it will be priced in. Linear metres for things like skirtings and DPCs. Square metres for walls, floors and roofs. Cubic metres for excavation and concrete. Numbers for doors, lintels and sanitaryware. Getting the unit right at this stage saves an awkward conversion later, when someone is trying to price a wall measured as a length.
Nothing gets folded into a round figure because it was awkward to measure properly. Nothing gets left off because it was small. The small items are where margin quietly disappears.
Step three: check the takeoff against itself
A takeoff doesn't go out on the first pass. Quantities get checked against the drawing schedules and cross-referenced between related trades. If there are twelve windows on the schedule, there should be twelve sets of lintels, cills and cavity closers. If the external wall area has been measured, the insulation and internal finish areas should make sense against it.
Any assumption gets flagged rather than buried in a rate. If the drawings don't show a foundation depth, the takeoff says what depth was assumed. If a detail is missing, it's listed as a query. That way you can see exactly where the risk sits before you price it.
A second look catches the item that got missed the first time round. Better it's caught here than by your site team three months later, or by the client's QS at valuation.
A takeoff you can't check line by line against the drawings isn't a takeoff. It's a guess with better formatting.
Step four: hand over numbers you can price from
What comes back is a structured set of quantities, laid out so you or your own team can check any line against the drawings. Ready to have rates applied and go straight into a tender. Not a headline total with no way to see how it was built, and not a document you have to reformat before anyone else can use it.
Because it follows NRM2, it also works as a starting point for other things: sending packages out to subcontractors, building a bill of quantities if the job needs one, or checking what you allowed for when a variation turns up. If you want the background on why this matters, what a quantity takeoff is and why it's worth getting right covers the basics.
The quantity takeoff step by step, as a checklist
If you measure your own jobs, this is the order worth sticking to:
- Log the drawings. List every drawing and its revision before you start, so you know exactly what the quantities are based on.
- Read before you measure. Go through plans, sections, details and specification together and note any conflicts.
- Measure in NRM2 order. Work element by element in the same sequence every job, in the unit each item will be priced in.
- Keep the small items. Lintels, closers, trays, fixings, making good. Measure them rather than allowing a vague sum.
- Cross-check between trades. Openings against lintels, wall areas against finishes, roof areas against coverings and gutters.
- Write down every assumption. If you had to guess, say so in the takeoff, not in your head.
Our quantity takeoff service follows exactly this order on every job, from the drawings up, and the fee is agreed before any measuring starts.
A rule of thumb for any takeoff you receive
Whoever does the measuring, the quantity takeoff step by step should be visible in what you get back. So here's a simple test. Pick three lines at random and try to find them on the drawings. If you can trace each one to a sheet, a revision and a measurement in under a minute, the takeoff was built properly. If you can't, don't price from it until you can.