Quantity takeoff vs BOQ: what is the difference?

Takeoff and BOQ compared

What is a quantity takeoff?

Quantity takeoff is the work of identifying and measuring construction elements from the project information. Depending on the trade, the output might include counts, linear lengths, areas, volumes or weights.

A useful takeoff keeps a link to its source. If a reviewer sees a floor area or fixture count, they should be able to return to the relevant drawing, schedule or model element and understand how it was measured.

What is a BOQ?

A BOQ arranges construction scope into descriptions, units and quantities that can be priced. It may use quantities produced by the takeoff, but it also needs a bill structure, work descriptions and a clear pricing basis.

Read the full guide to BOQs in construction for the fields and pre-pricing checks.

How takeoff becomes a BOQ

1. Review the current drawings, schedules, model and specifications.
2. Define the measurement scope and breakdown.
3. Measure each element and retain its source reference.
4. Group the quantities into pricing items and sections.
5. Write descriptions that state the work being priced.
6. Check that every takeoff item is included once in the BOQ.

One BOQ line may combine several takeoff measurements. The reverse can also happen when a measured element needs separate items for different specifications, locations or work stages.

Example: measuring and pricing a floor finish

The takeoff records the floor area from the applicable drawings and identifies the rooms included. The BOQ line then describes the finish, states the measurement unit and carries the accepted quantity into a pricing row. The estimator uses that row to build the tender rate from the specified material, installation resources and project allowances.

If the drawing area changes, the takeoff should show where and why. If the finish specification changes, the BOQ description and price basis need to follow it.

Common handoff mistakes

• Measured quantities have no drawing or model reference.
• The BOQ description does not match the specification used for takeoff.
• The same quantity appears in more than one pricing section.
• Openings, laps, waste or deductions are handled inconsistently.
• A revised drawing updates the takeoff but not the tender BOQ.

Where software helps

Digital and AI-assisted takeoff can reduce repetitive measurement work, but review still matters. The estimator needs to check the scope, drawing revision, source references and any low-confidence result before a quantity reaches the BOQ.

SupplyLoop's takeoff workspace connects drawing measurements to the next estimating step. The aim is a visible trail from source to quantity, then from quantity to price.