Many construction companies still manage project costs based on invoices. Understandable, but dangerously late: the accounts look back, while the site team needs to look ahead. Cost and margin variances only become visible when corrective action is expensive or no longer possible. Meanwhile, key agreements with suppliers and subcontractors often sit in notebooks, Excel or OneNote. Convenient for project and site managers, but neither transparent nor useful for managing the overall project.
Procurement-driven project control changes this. You shift the focus to purchase orders, delivery notes and contractual commitments, using three-way matching as a quality check. This brings costs and risks into view early, helping you maintain control of margins and cash flow.
The procurement-driven approach discussed below is one part of the picture. A complete project control process also brings together labour hours and crews, equipment and hire, production and revenue, and variations and their impact on margins. We will explore these in more detail in a future article.
The problem
1) Invoice-based project monitoring comes too late
The supplier determines when costs appear in your reports.
The result is reliance on accruals. Because invoices arrive late, the report depends on project managers remembering to accrue costs for invoices not yet received. This creates a risk of missed costs, distorted figures and fluctuating margins.
2) Scattered agreements
Agreements and commitments with suppliers and subcontractors are kept in notebooks, Excel or OneNote, rather than in the system, so they do not appear in the reports.
3. Fluctuating margins
Variances creep in; warning signs only appear with the invoice, when it is already too late.
The solution in three pillars
1) Three-way matching as a quality check
An invoice only passes when the purchase order or contract, the delivery note, and the invoice match on quantity, price, and terms. This stops errors, duplicate invoices, and ghost invoices at the gate and enforces data quality at the source. The result is reporting that rests on facts, not surprises after the fact.
"The purchase order is the agreement, the delivery note is the fact, the invoice is the confirmation."
2) Manage costs through delivery notes instead of invoices
Shift reporting from invoices to delivery notes, so costs become visible at the moment of delivery or performance. You gain insight weeks or even months earlier, and stand-alone accruals for invoices still to come become largely unnecessary. The risk of missed costs and swinging margins drops significantly.
People and process
Digital tools only work when people use them. On site, that means creating the delivery note the same day the work is done or goods are delivered, and linking it to the correct purchase order. Agree as a team who does this and by when. If something is missing, give feedback that same week. Keeping registration close to the moment is what makes real steering possible.
"The delivery note tells it today; the invoice confirms it tomorrow."
3) Include commitments immediately
What you agree with suppliers and subcontractors in a price comparison, contract, or addendum is recorded in the system as a commitment. Those commitments sit right next to the budget and form your cost to come: the costs still expected on the way to the total cost at completion. Whether it's unit rates, lump sum, or rentals and terms—by recording this structurally, you see margin impact early and can steer deliberately.
Three-way matching maintains data quality, delivery notes provide timely insight, and commitments show the costs ahead. Together, they help you manage what is coming rather than simply report what has already happened.
Checklist for a stress-free month-end close
- A delivery note records the cost immediately → no more separate accrual lists.
- Commitments show costs still to come → automatic visibility of future costs.
- three-way matching → invoices match the underlying records, and discrepancies receive targeted attention.
- The result: stable margins from month to month and reliable information for decision-making.
"Make delivery notes the rule and manual accruals the exception."
