The Middle East is on fire. The Strait of Hormuz is choked. Oil is above $120 a barrel. And right now, thousands of Australian builders are about to find out the hard way  just how exposed their supply chains really are.

We’ve Been Here Before, But This Time It’s Different

The post-COVID supply chain crisis of 2021-22 taught builders a brutal lesson: when global logistics breaks down, it doesn’t matter how good your programme is or how tight your client relationships are. If the materials are stuck on a ship off Singapore, the job stops.

Most of the industry spent 2023-2025 breathing a sigh of relief as things slowly normalised. Input prices stabilised. Lead times shortened. Builders started to feel like they could plan again.

Then February 28, 2026 happened.

The US-Israeli strikes on Iran and the subsequent closure of the Strait of Hormuz represent the most significant global energy supply shock in decades. And unlike the COVID disruption — which hit everything at once and then resolved  this one has the potential to drag on, escalate, and hit different categories of construction materials at different times.

The Australian Industry Group has already flagged rising shipping insurance costs, force majeure notices from overseas suppliers, and flow-on effects hitting plastics, copper, electrical products, and other materials Australian builders depend on every day. As one analysis put it: global events don’t need to stop all materials to damage your build cycle. They only need to disrupt a handful of high-dependency items on the critical path and suddenly you’re not managing construction, you’re managing disappointment.

The Strait of Hormuz: Why a Choke Point 8,000km Away Is Your Problem

Here’s the thing that trips most people up: Australia doesn’t directly import oil from Iran. So why does this conflict affect us?

Because roughly a third of all seaborne crude oil passes through the Strait of Hormuz. The refineries across Asia which process the fuel that powers the ships, trucks, and factories that supply Australia are heavily dependent on Middle Eastern crude. When that supply is disrupted, energy costs spike across the entire Asian manufacturing belt. When energy costs spike in Asia, the cost of making things goes up. And when the cost of making things goes up, the price of importing those things to Australia goes up too.

We’re already seeing it. By mid-March 2026, average petrol prices across Australian capital cities had spiked by around 40 cents per litre. Wholesale diesel hit $2.45 per litre. And that’s before the full lag in the supply chain from Asian refineries to Australian shores has even been felt.

The construction industry is particularly exposed. Diesel powers every excavator, concrete truck, crane, and delivery vehicle on your site. Bitumen a direct petroleum derivative is used in every road and driveway. Plastics, adhesives, sealants, and insulation materials all have petrochemical inputs. This isn’t abstract. It’s your margin, your programme, and your client’s move-in date.

Timber: The Nuanced Story Builders Need to Know

Timber is where the supply chain story gets a bit more complicated  and where a lot of commentary gets it wrong.

Standard pine framing for Australian residential construction wall frames, roof trusses is largely sourced from domestic softwood plantations, predominantly in Victoria, South Australia, and Western Australia. Australia has around one million hectares of softwood plantation, managed specifically for sawn structural timber. So if you’re building a standard timber-framed house and your frame supplier is sourcing domestically, your exposure to the current global disruption is relatively low for that component.

But here’s where it gets more complicated: engineered wood products are a different story entirely.

LVL beams, structural plywood, cross-laminated timber (CLT), and glulam are imported in significant volumes from Asia-Pacific, North America, South Africa and Chile. Australia’s domestic hardwood plantation estate simply isn’t configured to produce these products at scale yet. These are the timber products builders need to be watching closely right now.

Adding another layer of complexity: cheap Chinese timber imports particularly lower-grade joinery products have been flooding the market at roughly half the price of locally produced timber. This has forced Australian mills to scale back production, meaning the domestic supply base is actually thinner than it should be, just as global disruption hits.

The practical upshot for builders: standard structural pine framing from a domestic supplier low risk. Imported LVL, structural plywood, or engineered wood from offshore watch your lead times and prices closely.

Steel Framing: The Consistent Alternative

For builders looking at structural options with the most supply chain certainty, BlueScope TRUECORE steel stands out and not just because of the current conflict.

BlueScope is Australian, and TRUECORE steel is manufactured at Port Kembla in New South Wales  Australia’s largest integrated steelworks, operating since 1928. The iron ore used is predominantly Australian Pilbara ore. Like all steelmakers, BlueScope sources some coking coal from international markets, but the finished steel product itself is made here. There is no Chinese steel in TRUECORE framing. The roll-forming businesses that convert that steel into wall frames and roof trusses companies like Studco, Dynamic Steel Frame, and Australian Steel Framing are local manufacturers. The finished product supply chain is genuinely Australian.

The technical case has always been strong: termite-proof, dimensionally stable, bushfire-rated, with a 50-year warranty. But right now, in a world where global shipping lanes are under pressure, the supply chain case is equally compelling. The finished product is made here. It doesn’t need to come through the Strait of Hormuz. That’s a genuine advantage when half the world’s construction materials are stuck behind a choke point 8,000km away.

Cladding: A Local Hero Worth Knowing Better

If you’re not already specifying Weathertex, now is a very good time to look at it.

Weathertex is 100% Australian owned and manufactured — founded in 1939 in Raymond Terrace, NSW, and still operating there today. Made from 97% natural hardwood and 3% paraffin wax, with no added glues, resins, silica, or formaldehydes. It’s the only product of its kind globally with that claim, and it carries a 25-year guarantee against rotting, splitting, and cracking.

In an environment where imported fibre cement and composite cladding products face higher freight costs and longer lead times, Weathertex is genuinely well-positioned. It’s already certified Australian Made, it’s designed for Australian conditions bushfire, coastal, tropical and it’s available nationally.

For builders who currently specify imported cladding products, this is the moment to have the conversation with your clients about switching. It’s a better story on every front: local jobs, no import exposure, environmentally certified, and genuinely high-performing.

Beyond Weathertex, Australian hardwood weatherboards and structural timber cladding from domestic mills are also worth specifying over imported alternatives where possible. The supply chain logic is the same.

Air Conditioning: The Brands That Will Keep Delivering

AC is one of the most commonly delayed items in a residential build and that was before a global energy crisis. Most of the big international brands manufacture in exactly the parts of Asia most exposed to the current disruption. Here’s the honest breakdown:

The message for builders is clear: if you’re specifying AC as part of your builds particularly for volume residential work have the conversation with your clients now about going Australian-made. ActronAir’s builder rewards program is built for exactly this relationship. Seeley International (Breezair, Braemar) is another Australian success story worth backing.

Whitegoods: The Uncomfortable Truth

Most whitegoods sold in Australia are imported, and that’s not changing any time soon. Samsung, LG, Hisense, and Electrolux all manufacture predominantly in Asia. Fisher & Paykel, despite its premium reputation, was acquired by Haier (China’s largest appliance manufacturer) in 2012, and manufactures across Thailand, China, Italy, and Mexico.

That doesn’t mean you can’t specify these brands. But if the conflict drags on beyond a few months, you could start to see:

• Extended lead times on fridges, dishwashers, ovens, and washing machines
• Price increases as manufacturers pass on higher energy and freight costs
• Parts availability issues for servicing and warranty work
• Substitution pressure the model specified in February may not be available at handover

For builders with fixed-price contracts that include appliance packages, lock in pricing with your supplier now, or build a clause that allows for equivalent substitutions if specified models are unavailable.

Other Materials to Watch

Electrical Products & Copper

Copper prices surpassed US$13,000 per tonne in early 2026 driven by tight mine supply, electrification demand, and now the conflict adding freight pressure. Copper runs through every piece of wiring, every switchboard, every electrical fitting on your site. This is one to watch closely regardless of how the conflict plays out, because the underlying demand surge from electrification and data centres was already structural before the war.

Plastics, Sealants & Adhesives

Almost all plastics have a petrochemical base. Higher oil prices flow directly into PVC pipes, polystyrene insulation, vapour barriers, weatherproofing membranes, and the adhesives used in flooring, cladding, and wet areas. The cumulative cost impact across a full build can be significant even when no single item dominates.

Windows & Doors

uPVC frames and double-glazed units typically have imported components. Aluminium extrusions are exposed to energy cost pressures. Capral Aluminium produces Australian-made extrusions and is worth specifying over imported alternatives where you have the choice.

Roofing

COLORBOND steel made by BlueScope is again one of the better-insulated categories here, for the same reasons as steel framing: Australian manufacturing base, minimal Hormuz exposure. Imported roof tiles and terracotta products carry more risk. Terracotta in particular has already posted the largest price increases in the most recent Producer Price Index data.

Bitumen & Civil Works

For builders or developers involved in subdivision or infrastructure, this is the highest-risk category right now. Bitumen is a direct petroleum derivative a sustained oil price spike translates almost immediately into higher road surfacing and driveway costs. If you’re tendering civil work, lock in your bitumen pricing now.

What Smart Builders Are Doing Right Now

The builders who came out of the COVID supply chain crisis best weren’t the ones who got lucky — they were the ones who acted early, communicated clearly, and made deliberate decisions about where their materials came from. Here’s the smart play right now:

• Audit your supply chain. Know where every major component on your standard build comes from. If you don’t know, find out this week.
• Have honest conversations with suppliers about forward availability and pricing. Ask directly: what’s your exposure to the Hormuz disruption?
• Where you have a choice between an imported product and an Australian-made equivalent Weathertex over imported cladding, ActronAir over a Chinese AC brand, BlueScope steel framing, COLORBOND roofing make the switch now.
• On imported engineered wood products specifically: talk to your supplier about forward order windows and price lock options.
• Review your fixed-price contracts. If you have material or appliance packages locked in without escalation clauses, get advice on your exposure.
• Communicate proactively with clients. They’re seeing the news. They’re wondering if their build is affected. Getting in front of it builds trust.

Buying local isn’t just good for Australian jobs and communities in 2026, it’s also one of the most effective supply chain risk management strategies a builder can employ. The two things are no longer in tension. They’re the same thing.

The Bottom Line

The Iran conflict has made visible something that was always true but easy to ignore when times were good: Australia’s construction industry is deeply exposed to global supply chain disruption. We’ve built decades of cost efficiency on the assumption that goods will flow freely across the world’s shipping lanes. That assumption is being stress-tested again.

The builders who thrive through this period will be the ones who take supply chain resilience seriously: who make deliberate choices about where their materials come from, build relationships with Australian manufacturers, and talk to their clients openly about the environment they’re operating in.

Buy local. Not as a bumper sticker. As a business strategy.

Author: TGB Editorial