Quantity Takeoff vs Bill of Quantities: What’s the Difference?
Compare quantity takeoff to a BOQ: measurement activity vs tender/contract document, and how data flows between them.
Side-by-side
Quantity takeoff is the measurement work: reading drawings, applying rules, and listing quantities. A bill of quantities packages those quantities (often with descriptions tied to specs) for pricing and contract administration.
You can have a takeoff without a formal BOQ (e.g. internal estimating). A BOQ on a tender usually implies agreed methods, clear item boundaries, and columns for rates and amounts.
Think of takeoff as the engine room and BOQ as the formatted output for commercial and legal use—same underlying numbers, different audience and rules.
Typical workflow
Estimators produce takeoff sheets or digital measurements, then abstract items into a BOQ structure aligned with the contract. Changes to drawings force takeoff updates before BOQ revisions are issued.
Software that starts from PDF or model data can reduce transcription errors between takeoff and BOQ lines.
On large jobs, takeoff may be split by discipline while BOQ is merged by work section—someone must reconcile overlaps (e.g. concrete box-outs vs MEP penetrations) before issue.
What each document looks like in practice
A takeoff file might be spreadsheets with dimensions, markups, or software exports with polygon areas and counts. A BOQ is usually a formal table with item numbers, descriptions, units, and quantities ready for rates.
If your contract says “quantities are indicative,” the legal weight differs from a remeasurement contract—always read the tender instructions alongside the BOQ.