What is a takeoff in construction?

Takeoff vs estimate vs quotation

These three get used interchangeably on site, but they are separate steps:

• Takeoff — the quantities. 46 no. 47×100 C16 joists at 4.2m, 18m² of 100mm PIR, 1,240 no. facing bricks.
• Estimate — the quantities priced at your rates, with wastage, labour hours, plant, prelims and overheads added.
• Quotation — the estimate plus margin and VAT, presented to the client with your exclusions and assumptions.

How a UK builder does a takeoff

1. 1
   Read the drawings and the spec together

   Quantities come off the plans, but the products come off the specification and the building control notes. Measuring without reading the spec is how you end up pricing the wrong insulation.

2. 2
   Break the job into sections

   Substructure, superstructure, roof, external walls, first fix, second fix, finishes, externals. Most UK estimators lean on NRM2 section order so nothing falls between trades.

3. 3
   Measure in the unit you buy in

   Concrete in m³, blockwork in m², timber in actual stock lengths, plasterboard in sheets. Measuring in linear metres when you buy 4.8m lengths is where cutting waste hides.

4. 4
   Round up to stock lengths and pack sizes

   You cannot buy 3.6m of a 4.8m joist. Convert linear quantities into whole lengths, whole packs and whole rolls before you price anything.

5. 5
   Add wastage per material, not across the board

   Roughly 5% on blockwork and bricks, 10% on cut timber and boards, more on anything with a lot of raking cuts. A blanket 10% on everything overprices half the job and underprices the rest.

6. 6
   Quantify labour alongside materials

   Every measured item carries hours. Price those hours off your standing labour rates by trade so the same bricklayer rate applies on every job you quote.

7. 7
   List what you have assumed

   Ground conditions, existing structure, access, anything not shown on the drawings. Your assumptions are what protects the quote when the job opens up.

Where takeoffs usually go wrong

• Linear metres left as linear metres. Timber, guttering and skirting are bought in fixed lengths; unconverted quantities understate every order.
• Labour bolted on as a percentage. A percentage of material cost has no relationship to how long the work takes.
• Old prices. A price book from last year on a twelve-week programme is a loss waiting to happen — get live supplier prices per section.
• No section structure. One long list makes it impossible to see which part of the job carries the risk, or to send a single trade's package out to suppliers.
• Missing information priced as if known. If the drawings do not say, ask the question before you price it.

How AI takeoff software changes the job

Measuring an extension by hand is half a day to two days of scale rule, calculator and spreadsheet. AI takeoff reads the drawings and the specification together, cross-checks them, and returns a sectioned, quantified list in minutes. What it does not do is replace your judgement — it gives you something complete to check instead of a blank sheet.

In BuildWiseOS that means:

• Drawings and specs cross-referenced, with a list of the missing information it needs from you before it prices.
• Timber given as actual stock lengths, rounded up to full lengths rather than left as linear metres.
• Sections in NRM2 order, each one able to go straight out to suppliers as a request for quotation.
• Labour priced from your own rates, held once and applied across every project.
• Straight through to quotation, with margin, VAT treatment including CIS reverse charge, and a build programme.