Fuel Disruption and Construction Contracts - What NZ Contractors Need to Know

Fuel prices don't move in straight lines. Whether driven by geopolitical tension, global supply disruption, or domestic market dynamics, fuel cost volatility is now a persistent feature of the New Zealand construction landscape. When costs spike, the instinct is to look for relief - up the contract chain toward the principal, and downward toward subcontractors. The problem is that the contract determines what relief is actually available.

Under NZS 3910, the default position is clear: the contractor bears supply chain risk. Fuel is an input cost. The contractor is assumed to have priced it at tender. If fuel costs increase between tender and completion, the contractor wears that difference. Market sympathy does not translate into legal entitlement.

There are circumstances where recovery may be possible, but each pathway is narrow and conditional. A fluctuations clause, when included and active, allows the contract price to be adjusted for changes in the cost of labour, plant, and materials. It is frequently excluded in fixed-price arrangements — if it is excluded, there is no entitlement to escalation regardless of the scale of the cost movement. Fuel cost escalation alone does not constitute a variation — there is no instruction, no change in scope, no qualifying trigger.

The change in law provision is more relevant than many contractors realise.