Cost certainty is a choice: practical levers for Australian project engineers
Reviewed by Tom Sullivan
First reported on Roads & Infrastructure (AU)
30 Second Briefing
Cost volatility across Australian infrastructure is now driven less by isolated shocks and more by interacting risks such as supply chain fragility, labour constraints and rapid design change, argues Sam Mendoza, National Director and National Infrastructure Lead at WT. Mendoza calls for earlier whole‑of‑life cost modelling, tighter scope definition before procurement, and dynamic risk allowances that are actively re‑priced through delivery rather than fixed as a single contingency line. For geotechnical and civil teams, this means locking in ground investigation scopes, material specifications and staging assumptions much earlier to avoid cascading re‑design and escalation.
Technical Brief
- WT’s cost planning approach disaggregates escalation drivers into labour, materials, plant, preliminaries and risk.
- Mendoza argues for project-specific escalation curves rather than applying a flat annual percentage uplift.
- Scenario modelling is framed around discrete triggers such as programme slippage, scope creep and procurement route changes.
- WT emphasises aligning contract packaging with market capacity to avoid premium pricing from over-stretched contractors.
- Procurement timing is treated as a controllable variable, with early-market testing used to benchmark live rates.
- Cost reviews are recommended at each design gateway, with risk allowances re-priced against updated quantities and scope.
- For brownfield works, interface risks with live assets are explicitly costed rather than buried in general contingency.
- Mendoza positions cost governance as an executive function, requiring board-level tolerance bands for budget movement.
Our Take
WT’s own Australian Construction Market Conditions Report, referenced in a related June 2026 piece, flags at least three years of elevated escalation, so any ‘cost certainty’ strategies proposed here will need to be robust to a medium-term high-cost environment rather than a short spike.
Across our 875 Infrastructure stories, Australia’s transport and civil pipeline is one of the few regions where sustained cost pressure is being discussed alongside labour and procurement risk, suggesting WT’s recommendations are likely to focus as much on delivery models and risk allocation as on traditional cost planning levers.
The Roads & Infrastructure Magazine ‘Roads Review: Looking Forward’ article indicates industry optimism is shifting away from mega-projects, which implies that WT’s call for cost certainty may be particularly relevant for a more fragmented pipeline of smaller, people-centred projects where overruns are harder to absorb.
Prepared by collating external sources, AI-assisted tools, and Geomechanics.io’s proprietary mining database, then reviewed for technical accuracy & edited by our geotechnical team.
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