Practical EPC guide
BOQ vs budget vs estimate in EPC projects
Learn what each record means and how to connect it with commitments, bills and project cost.
Short answer: The estimate predicts delivery cost. The BOQ lists measurable work and quantities. The budget sets the approved spending limit. Keep them linked, but never treat them as the same record.
Remember these three points
- Keep the original estimate
- Record every approved BOQ change
- Check commitments before bills arrive
Give each record one job
Use the estimate for expected cost, the BOQ for measurable scope, and the budget for internal control. When one sheet does all three jobs, teams lose the original baseline.
- Estimate: expected cost and assumptions
- BOQ: scope, quantity and rate
- Budget: approved spending limit
Keep every approved change
Project quantities and scope change. Keep the first baseline, then record each approved revision with its reason and date. Do not overwrite the old figure.
- Keep the baseline
- Separate pending and approved changes
- Link changes to packages and purchases
Count commitments before invoices
A purchase order or subcontract work order creates cost before the bill arrives. Review committed cost beside actual cost to see exposure earlier.
Open the record behind the variance
Start with the project variance. Narrow it to a package, material or cost head. Then open the order, receipt, issue or bill that caused it.
Common questions
Is a BOQ the same as a project budget?
No. A BOQ describes measurable scope and quantities. The budget sets the approved internal spending limit. They should be linked, not merged.
When should committed cost appear?
Show committed cost when an approved order or contract creates cost exposure. Do not wait for the invoice.