YOU ASK
My construction budget is spread evenly over 18 months. How do I make the drawdown peak in the middle instead?
propfessor.Companion exampleThe short answer
Use the construction cost line’s S-Curve field. E spreads the cost evenly. S and S1 to S10 select editable drawdown profiles, so you can match the payment pattern without rebuilding the cost line.
Work through it
- On the Input sheet, find the Construction Costs line. Keep its quantity, rate, Start and 18-month Span aligned with your budget and programme.
- Open the cost drawdown profiles on the Profiles or S-Curve sheet in your release. Choose an unused profile, such as S1, and set the cumulative spend pattern to rise more quickly through the middle. Cumulative percentages build towards 100%; they are not separate monthly payments.
- Return to the construction line and select that profile in S-Curve. Recalculate, then inspect the monthly construction cash flow. Check any other cost lines sharing that profile before editing it again.
| Control | What it changes |
|---|---|
| Quantity × rate | The base construction amount |
| Start and Span | When the cost begins and how long it runs |
| S-Curve | How that amount is distributed across the span |
A workflow checklist, not a calculated appraisal. Profile names and sheet placement depend on the release.
WHAT YOU CAN DO NOW
You can make the construction cash flow follow the programme and explain which assumption changed.
Does changing the S-curve change my total budget?
It changes the drawdown pattern, not the quantity or rate you entered. Compare the base cost before escalation, then check escalated costs and finance separately: different payment timing can change those results. Also check contingency and other lines tied to the construction spend.
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