The Tanker Clock: What Construction Professionals Need to Know before the Last Hormuz Cargoes Clear

On February 28, the United States and Israel launched strikes on Iran. Within days, Iranian forces declared the Strait of Hormuz closed and began attacking commercial shipping. Brent crude opened that week at nearly $71 per barrel and briefly broke $100. This represented a 51% one-month gain, the second largest since futures trading began in 1983. Emergency policy measures partially walked that back, with Brent settling in the $92–105 range through late March. Gas prices crossed $4 per gallon nationally.

The Strait carries roughly 20 million barrels per day, or about 27% of global maritime oil trade. When it shuts, there is no short-term substitute.

Why should construction professionals be focused on something other than gas prices?

Because gasoline is not a construction input. Diesel is. The two are not affected equally by this disruption.

Refineries optimized for Gulf production run on light-sweet crude. When that feedstock disappears, they face a choice: substitute heavier crudes or run at reduced capacity. Neither option is neutral. Heavy crude yields a different product slate with less middle distillate per barrel, which means less diesel. The cracking spread, which measures refinery margin on diesel relative to crude, widens under feedstock stress because diesel becomes scarcer relative to gasoline even at the same crude input price. The pump price headline understates the diesel problem.

Diesel powers every piece of heavy equipment on a project site and is embedded in every freight surcharge and every asphalt price your subcontractors carry into a bid. The gas price story is for consumers. The diesel story is for preconstruction.

What is the tanker clock, and is there only one?

There are at least two and the second one is slower.

The first clock is diesel. Oil loaded in the Persian Gulf takes roughly three to four weeks to reach US ports, then goes through refining before it shows up at a terminal or asphalt plant. The US and other consuming nations have been managing the disruption with the largest coordinated strategic petroleum reserve release on record at 400 million barrels plus temporary sanctions exemptions on Russian and Iranian crude. Those measures have held paper prices in check. But the last tanker cargoes that cleared the Strait before effective closure are arriving in early-to-mid April. Once that physical buffer works through the refinery system, the emergency bridge ends.

The second clock is resin. Petrochemical feedstocks, the naphthas and gas liquids that become pipe, fittings, insulation, sealants, and adhesives, run on a materially longer supply chain. By the time crude becomes a refinery feedstock, moves to a chemical plant, becomes a resin, gets compounded into a finished product, and reaches a distributor, you are looking at a three-to-five-month lag from the original supply disruption. The construction industry's MEP materials exposure to this disruption will not fully price in until late summer or early fall. This is well after most current project estimates will have been signed.

The question for anyone writing a construction estimate this week is not what oil costs today. It is what diesel costs when your excavator is running in June, and what HDPE pipe costs when your plumber orders it in August.

The EIA is forecasting Brent below $80 by Q3. Isn't this temporary?

The EIA forecast is explicitly conditioned on assumptions about conflict duration and production recovery. It is a scenario, not a prediction.

Even if a ceasefire comes in the next few weeks, physical oil production does not recover on the same timeline. The CEO of Kuwait Petroleum Corporation said recently it would take three to four months to return to full output once the war ends. Damaged refinery infrastructure takes longer still. This is the argument made in this space after the earlier conflict post. Resolution is not recovery. A signed agreement does not immediately restore the 8 million barrels per day the IEA estimates were curtailed in March and it does nothing for the resin supply chain that is already mid-cycle on a month-long lag.

A project bidding today and procuring materials in Q3 is pricing into the optimistic scenario without necessarily knowing it.

What two outcomes should owners plan for, and what should they actually do?

Scenario A — Hormuz reopens within the next few weeks.

Diesel stays elevated through Q2 as the supply pipeline refills, then eases toward the EIA base case in Q3. Resin-based materials see pressure through late summer before normalizing. Manageable with appropriate contract language and active procurement scheduling.

Scenario B — The Strait stays closed through May or beyond.

Emergency measures expire mid-April with no replacement. Analysts modeling this scenario put Brent in the high-$100s or above. This is the level where demand destruction becomes the market-clearing mechanism. Diesel and asphalt track accordingly, and the resin clock runs hot into Q4.

For Scenario B, two tactical responses are available to owners and contractors right now.

The first is contractual. Standard force majeure clauses typically cover supply unavailability but not price escalation. Those are different legal theories. If your current contract form does not include an explicit material price escalation clause tied to a named index, it should. The ConsensusDocs 200.1 amendment is the most commonly used mechanism. The AGC updated its guidance on this language as recently as April 2. Waiting until costs have moved to negotiate that language is too late.

The second is procurement. For fuel-intensive scopes, some owners and larger contractors have access to diesel hedging instruments through their banks or fuel suppliers. These are typically fixed-price forward purchase agreements on anticipated consumption volumes. These are not common in construction, but they exist. Scenario B is precisely the environment where the cost of a hedge looks cheap in hindsight.

The Bottom Line

The construction industry does not buy crude oil. It buys diesel, asphalt, and polymer-based materials which are all downstream of the Strait of Hormuz. They are on two different clocks with two different lag structures.

The first clock expires in days. The second is already running.

Owners should be asking their preconstruction teams two questions. What did we price diesel at? When does our subcontractor actually buy it? Then the same questions again, substituting pipe for diesel and August for June.

If nobody has clean answers, that is the risk.

 

Data sources: IEA Oil Market Report, March 2026; EIA Short-Term Energy Outlook, April 2026; CRS, "Iran Conflict and the Strait of Hormuz," March 2026.