Measurement mistakes
- Mixed units: a linear-metre item measured in square metres or the reverse. Fix each item's unit as in the BOQ before starting.
- Missing deductions: openings, doors and windows are deducted from blockwork, plaster and paint according to the method of measurement in the contract.
- Scaling from the drawing: use written dimensions; where they are missing, raise an RFI instead of guessing.
Scope mistakes
- Forgotten items: temporary works, insulation under slabs, movement joints and render behind cladding often drop out.
- Double counting between disciplines: one item measured twice in architecture and structure, such as structural blockwork or floors.
- Working from an old revision: confirm the take-off uses the latest drawing revision and write it in the sheet header.
Calculation mistakes
- Waste inside the quantity: tender quantities are usually net; waste belongs in the unit rate, unless the contract says otherwise.
- Figures without references: every quantity should link to its drawing and page so it can be checked.
- Broken formulas: hard-typed numbers instead of formulas stop checking and hide errors.
- No benchmark check: compare results with known ratios, such as reinforcement per cubic metre of concrete, to catch large errors.
How we check a take-off before pricing
We check every discipline twice, once against the drawings and once against benchmarks, and keep formulas open in Excel with a drawing reference for each quantity. For the next step see how an item price is built up.
Take-off costs are in quantity take-off prices 2026, or estimate yours in the quote calculator.
Frequently asked questions
Is waste added to the BOQ quantity?
Usually not. Tender quantities are net and waste is carried in the unit rate, unless the contract or method of measurement says otherwise.
Which items are most often forgotten?
Temporary works, insulation under slabs, movement joints, render behind cladding and small finishes around openings.
How do I check a take-off?
Link every quantity to its drawing, and check each discipline once against the drawings and once against known ratios such as reinforcement per cubic metre of concrete.
