Setting CAPEX Contingency on an Industrial Project Without Guessing
Contingency should be set from the maturity of the estimate, not from habit. A concept-level industrial estimate built on benchmarks reasonably carries 25 to 40 per cent; a budget estimate with quoted major equipment carries 15 to 25 per cent; a definitive estimate with firm quotes and a completed site survey carries 5 to 12 per cent. A flat 10 per cent applied at concept stage is the single most common cause of an industrial project returning to the board for more money.
Contingency by estimate class
The industry convention is to tie both accuracy and contingency to how much of the project is actually defined. The ranges below are indicative for industrial plant and equipment projects.
| Estimate maturity | Definition available | Accuracy range | Indicative contingency |
|---|---|---|---|
| Concept | Capacity and location only | -30% to +50% | 25–40% |
| Budget | Major equipment quoted, layout drafted | -15% to +30% | 15–25% |
| Control | All major packages quoted, site surveyed | -10% to +20% | 10–15% |
| Definitive | Firm quotes, detailed design, contracts drafted | -5% to +10% | 5–12% |
What contingency covers — and what it must not
Contingency covers the known-unknowns within the defined scope: quantity growth, minor design development, installation surprises, small price movements. It is not a slush fund for scope the sponsor decided to add later, and it is not an escalation allowance or a currency hedge.
- In scope for contingency: quantity growth, minor redesign, installation complications, commissioning overrun.
- Not contingency: added scope (raise a change order), price escalation (separate allowance), FX movement (hedge or allowance).
- Not contingency: optimistic productivity assumptions — fix the estimate instead.
A risk-based method you can defend in an hour
Rather than one percentage, list the five to eight risks that can actually move the number, assign each a probability and a cost impact, and sum the expected values. The total is your contingency, and the register is the justification.
- Ground conditions worse than assumed — probability, impact, expected value.
- Utility connection capacity insufficient — probability, impact, expected value.
- Equipment delivery late, extending site costs — probability, impact, expected value.
- Import duty or classification change on the equipment package.
- Local installation labour productivity below the estimate basis.
- Commissioning extended by raw material or utility instability.
Governing the drawdown
Contingency that nobody controls is spent by month three. Assign a single approver, require a written cause for each drawdown, and report the remaining balance against project completion percentage at every steering meeting. If 60 per cent of contingency is gone at 25 per cent completion, the estimate — not the contingency — is what needs revisiting.
Where the project is financed, lenders will expect exactly this discipline, and a documented contingency register is one of the fastest ways to make a capex figure credible in a credit review.
Frequently asked questions
How much contingency should an industrial project carry?
It depends on estimate maturity: roughly 25 to 40 per cent at concept, 15 to 25 per cent at budget stage, and 5 to 12 per cent once firm quotes and detailed design are in place.
Is contingency the same as an escalation allowance?
No. Contingency covers known-unknowns inside the defined scope. Escalation covers price movement over time and should be a separate line with its own assumption about the period and the index used.
Can contingency be used to fund added scope?
It should not be. Added scope belongs in a change order with its own approval, otherwise the project loses the buffer it needs for the risks contingency actually exists to absorb.
Do lenders accept a contingency line in the capex?
Yes, and they expect one. What they scrutinise is the basis: a percentage with no justification is treated as a guess, while a risk register with probabilities and impacts is treated as an estimate.
What contingency applies to a brownfield expansion?
Usually higher than greenfield at the same estimate maturity, because tie-ins, existing-condition surprises and production interruption risk are harder to define in advance.
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