Category: Quantities & pricing
Prepared by Eng. Ahmed Fathy, Projects Manager ·
Definition
A bill of quantities divides the project into numbered items, each with a description, unit and quantity. The contractor enters a unit rate against each and the bid total follows.
Why it matters on a project
It is the basis for comparing bids, certifying payments and pricing variations. A vague or incomplete BOQ means disputes for the whole project.
Worked example
Item: C30 reinforced concrete to slabs, unit m³, quantity 24, rate 356 SAR, amount 24 × 356 = 8,544 SAR.
Common mistake
Describing items in general words such as 'finishing works' without material, thickness or method of measurement.
Frequently asked questions
Who prepares the bill of quantities?
The consultant's or owner's quantity surveyor before tender; the contractor prices it when bidding.
Are BOQ quantities binding?
In a remeasured contract they are adjusted to actual work; in a lump-sum contract the contractor carries the quantity risk.
Related terms
- Quantity take-offExtracting quantities from drawings under defined measurement rules, with a reference for every figure.
- Unit rateThe item price per unit of measure, built from material, labour and equipment then indirect costs and profit.
- Re-measured contractA contract paid on actually executed quantities multiplied by unit rates.
- Engineer’s estimateThe cost estimate prepared by the consultant or owner to compare contractor offers.
- Provisional sumAn amount included in the contract for work not yet defined, spent on actuals.
Read next
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