By The Good Builder editorial
The construction industry in Australia may look a long way from the battle lines in the Middle East, but it is tightly connected to them through fuel, freight, imported inputs, project finance and business confidence. As of March 2026, the conflict has expanded beyond direct US-Iran strikes, with Reuters reporting that the US and Israel are conducting operations against Iran, while Iranian retaliation has affected Israel, the UAE, Qatar, Bahrain and Kuwait, and wider regional airspace and shipping routes have been disrupted. Reuters also reported that the Strait of Hormuz has been closed, or severely choked, long enough to push crude prices sharply higher and raise global growth concerns.
For Australia, the most immediate consequence is not likely to be a physical shortage of bricks, timber or steel on day one. It is more likely to be a rolling cost shock. Construction is a fuel-intensive industry. The Australian government notes that the sector uses large volumes of diesel for machinery and equipment, and that energy is a major operating input. That matters because diesel touches almost every part of the building chain: earthmoving, quarrying, concrete haulage, steel transport, crane logistics and regional delivery. When oil rises, construction costs usually feel it quickly, especially on civil, infrastructure and heavy commercial jobs.
That fuel channel is the clearest transmission mechanism from the conflict to Australian building activity. Reuters reported this week that oil settled at its highest in more than a year and then rose again by roughly 5% as the Iran crisis widened and supply concerns intensified. Another Reuters report said the closure or disruption of Hormuz had already helped lift crude by around 12%. Because about a fifth of the world’s oil and LNG trade passes through the Strait of Hormuz, even a temporary interruption can reset freight and energy pricing well beyond the Gulf. ABC similarly noted that Australia would not be immune from a slowdown in traffic through the strait.
For Australian builders, higher oil does not just mean dearer fuel at the bowser. It increases the cost base of upstream manufacturing and transport. ABS data for the latest Producer Price Index release show that house-construction input prices were broadly stable into late 2025, with only a 0.2% quarterly rise, but the ABS also said cost pressures that did appear were linked to energy, fuel and raw materials. In other words, the sector had only just moved into a more stable pricing environment after the earlier post-pandemic surge. A new oil shock risks interrupting that stabilisation.
The effect would probably be most visible first in roads, subdivisions, earthworks and infrastructure. Bitumen is petroleum-based, so a sustained oil spike usually feeds directly into asphalt and road surfacing costs. Large civil contractors are also more exposed to diesel consumption than many residential builders. Australia’s infrastructure pipeline remains substantial, with the federal department highlighting continued work on major transport and Olympic-related projects, while Infrastructure Australia says fabricated steel remains a crucial input to the delivery of the national infrastructure program. In that environment, even a modest rise in fuel, steel fabrication and freight can have outsized budget consequences because public megaprojects run on thin assumptions across enormous volumes.
Freight and shipping are the second major risk. Even if Australia does not import most construction materials directly from Iran or the war zone, global shipping is a connected market. Disruption in the Gulf raises tanker rates, reroutes vessels, increases insurance premiums and can tie up ship capacity that would otherwise service Asia-Pacific trades. Reuters reported that Exxon is sending unusually long-haul fuel cargoes from the US Gulf Coast to Australia because normal trade flows have been disrupted by the Hormuz crisis, and that freight costs and vessel scarcity could limit how workable those alternatives are. That is important for construction because it shows Australia may still get supply, but often at a higher landed cost and with more timing risk.
This can spill into building materials in indirect ways. Steel, aluminium, glass, fixtures, mechanical equipment and electrical components all depend on shipping markets and energy-intensive production. Infrastructure Australia has already warned that fabricated steel is a critical input across foundations, beams, girders and major infrastructure systems. If conflict-driven freight costs rise at the same time as energy prices increase, imported or trade-exposed construction products can become more expensive even when domestic demand is not especially strong. The result is not necessarily a blanket shortage, but a more volatile procurement environment where quotes expire faster, contingencies grow and lead times become harder to trust.
There is also a financing and confidence effect. The European Bank for Reconstruction and Development said this week that the Iran conflict threatens economic growth by reducing investment risk appetite, and Reuters reported that the shock could complicate monetary policy if higher energy prices lift inflation. Australia has already been trying to manage the cost of housing delivery, and external inflation pressure is unhelpful. The RBA has previously noted that higher materials and transport costs can pass through to prices across goods-related sectors, while more recent RBA commentary has discussed the broader pass-through of higher import costs into inflation. For construction, that means the war may hit not only project costs but also the cost of capital, buyer confidence and the willingness of developers to proceed with marginal projects.
Residential construction may therefore feel the impact differently from engineering construction. Home builders are less exposed to bitumen and bulk diesel than civil contractors, but they are highly sensitive to interest rates, consumer sentiment and subcontractor pricing. Australia is already behind the pace needed to deliver its national housing ambitions, with independent reporting based on ABS data showing the country is building materially fewer homes per quarter than required to stay on track for federal targets. A fresh inflation shock that keeps financing tight or lifts freight-sensitive imported products such as fixtures, appliances, glazing systems and some steel items would make that challenge harder, not easier.
Another issue is project risk allocation. During stable periods, builders can absorb some short-term movements in fuel or imported products. During geopolitical shocks, that becomes more difficult. Fixed-price contracts are especially vulnerable when sudden input changes arrive after tender. Contractors then either wear margin compression or try to negotiate variations, delays or substitutions. This is where the current conflict matters even if it fades quickly: it reminds principals, developers and governments that global geopolitical risk now needs to be priced into procurement. After the cost blowouts of the past several years, many Australian construction businesses do not have much room left to absorb another external shock. ABS data show house-construction input inflation cooled sharply from the peaks of 2021–22, but the industry has not forgotten the damage caused by rapid cost escalation and delayed pass-through.
How severe could the impact become? That depends on duration. If the disruption is short-lived and Hormuz traffic normalises, the effect on Australian construction may be noticeable but manageable: higher diesel, some freight volatility, tighter tendering and a little more caution from developers. If the conflict drags on, however, the consequences become more structural. Reuters has already reported wider regional attacks, sustained operations, and a market reassessment of oil and shipping risk. In that scenario, Australian contractors could face a second-round cost problem: not just expensive fuel, but dearer logistics, higher insurance, longer procurement times, and a more cautious lending environment.
Australia also has a fuel-security angle. The federal government says it is trying to improve resilience through minimum stockholding obligations, support for domestic refining capability and expanded diesel storage. That is positive, but it also underlines the underlying vulnerability: Australia remains exposed to imported liquid fuels and international trade routes. In practical construction terms, that means the industry cannot assume it is insulated simply because many projects use domestic labour and some locally sourced raw materials. The machines still run on diesel, the roads still depend on petroleum-linked products, and major projects still rely on globally traded steel, equipment and shipping.
The bottom line is that the US-Iran bombing campaign and the wider countries being drawn into the conflict are unlikely to stop Australia’s construction industry overnight, but they do raise the risk of renewed cost escalation at exactly the wrong moment. After a period of partial stabilisation in construction input prices, the industry is exposed again through fuel, freight, imported manufactured products, inflation expectations and financing conditions. Civil and infrastructure work are likely to feel the first and hardest hit, while residential construction may suffer more through financing pressure and cautious consumer demand. If the conflict is contained quickly, the damage may be limited to margins and pricing uncertainty. If it is prolonged, Australia’s construction sector could face another difficult cycle of tender stress, project repricing and slower delivery.
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