The Fuel Price Just Went Up. Your Contract Didn’t.

Fuel prices have once again moved to the centre of public discussion in New Zealand. Over the past few weeks, government officials have warned that the country could be facing a prolonged disruption to global fuel supply as tensions in the Middle East continue to affect international energy markets. The Prime Minister has cautioned that the situation “could get worse before it gets better,” and ministers are already considering contingency planning for a potential fuel shortage scenario.

For most people, rising fuel prices mean higher commuting costs or more expensive groceries. For the construction industry, however, the implications are much deeper. Fuel sits quietly behind almost every activity on a construction project. It powers machinery, moves materials, drives logistics, and keeps subcontractor operations running. When fuel costs rise suddenly, the effect spreads quickly through the entire supply chain.

Concrete deliveries become more expensive. Steel transport costs increase. Earthmoving equipment costs more to operate. Subcontractors start adjusting their pricing to reflect higher operating costs. Yet the contract sum agreed months earlier often stays exactly the same.

This gap between the real cost of delivering the work and the contractual price is where problems start to appear.

Many in the construction industry will remember a similar moment during the early stages of Covid-19. When global supply chains collapsed and shipping routes were disrupted, material costs surged almost overnight. Contractors who had priced projects under stable economic conditions suddenly found themselves delivering those projects under completely different realities. The pandemic revealed something the industry sometimes forgets: external shocks do not change the contract. Unless the contract includes specific mechanisms allowing cost adjustments, the financial burden often remains with the party who priced the job.

The current fuel situation echoes that same lesson.

Energy shocks themselves are not new. New Zealand experienced similar pressures during the oil crises of the 1970s, when global geopolitical instability triggered severe fuel shortages and forced the government to introduce extraordinary measures such as petrol rationing and “carless days.” The context today is different, but the underlying reality remains the same. When global energy markets are disrupted, the economic effects travel quickly across national borders and into local industries.

Construction is particularly exposed because projects are typically priced long before the work is completed. A contractor may submit a tender based on assumptions about labour availability, transport costs, fuel prices, and supply chain reliability. Months later, when the project is underway, those assumptions may no longer reflect reality. However, unless the contract specifically allows for adjustments, the risk allocation remains unchanged.

This is why the question in construction law is rarely about fairness. It is about what the contract says.

When fuel prices rise significantly, the key issue becomes whether the contract includes any mechanism that allows the cost impact to be shared or adjusted. Some contracts contain fluctuation clauses or escalation provisions for long-term projects (although most of those clauses were crossed off at the signing stage). Others allow variations if supply chain conditions materially change. But many traditional fixed-price contracts contain no such flexibility at all. In those cases, the contractor may find themselves absorbing cost increases that were never anticipated when the tender was submitted.

Interestingly, disputes rarely emerge at the moment the fuel price rises. They tend to appear months later. By that time, contractors may have already absorbed multiple layers of additional cost across materials, transport, and subcontractor work. Margins begin to shrink and cash flow becomes tight. Eventually the commercial pressure forces a difficult conversation: should this cost really sit with the contractor, or is it a risk that should have been shared?

By the time that question is asked, the project may already be under financial stress.

The broader lesson from both Covid and the current fuel situation is that uncertainty has become a permanent feature of the global economy. Supply chain disruptions, geopolitical conflicts, inflation, and energy volatility are no longer rare events. They are recurring realities that increasingly affect construction projects.

Contracts cannot eliminate uncertainty, but they can allocate risk more clearly.

Before signing a contract, it is worth pausing to ask a few practical questions:

• What happens if transport costs increase significantly during the project?

• What happens if supply chains become unstable?

• Is there any mechanism that allows long-term price volatility to be addressed?

These questions are not about pessimism. They are part of responsible commercial planning in an unpredictable world.

Construction projects may take place locally, but they are never isolated from global conditions. Fuel prices, international conflicts, and supply chain disruptions all have the ability to reshape project economics overnight. When that happens, the contract does not automatically adapt.

And when external uncertainty meets a fixed contract price, disputes are rarely far behind.