The Numbers Behind the Squeeze

The construction industry entered summer 2026 facing its most acute cost escalation environment since the pandemic-era supply chain crisis — but with a different character. This time, the pressure is not widespread material shortages. It is pricing instability concentrated in specific categories, driven by a combination of energy market disruption, Section 232 metals tariffs, and geopolitical conflict that has pushed fuel prices sharply higher.

Construction input prices rose 1.7 percent month over month in April 2026 and are up 6.2 percent for the first four months of 2026 alone — more than the cumulative 4.8 percent increase recorded across the prior three years combined, according to an Associated Builders and Contractors analysis of Bureau of Labor Statistics Producer Price Index data. Overall construction input prices are now 7.0 percent higher than a year ago, with nonresidential construction input costs up 7.4 percent year over year.

The specific material increases are stark:

• Diesel fuel: Up 13.6 percent month over month in April and up 73.8 percent year over year — the second-largest single-month increase in BLS tracking history
• Liquid asphalt: Up 41 percent month over month in April
• Steel mill products: Up 15 percent year over year
• Aluminum mill shapes: Up 34 percent year over year
• Copper and brass mill shapes: Up 21 percent year over year
• Crude petroleum: Up 11.3 percent month over month in April

AGC Chief Economist Ken Simonson — in his 25th year analyzing construction economics — stated that most of this has not been passed through to owners yet, but will have to be: construction is so dependent on materials hit by heavy tariffs that it can expect to see much higher costs going forward than most other industries.

Two Drivers: Tariffs and the Iran Energy Shock

The construction cost surge has two primary engines. The first is the Section 232 metals tariff regime — currently at 50 percent on steel, aluminum, and copper imports — which has pushed structural metal prices well above prior-year levels for the past several quarters. On June 1, 2026, President Trump signed a proclamation reducing certain tariffs on imported copper, steel, and industrial products from 25 percent to 15 percent, with the reduction slated to remain in effect through December 2027. However, Section 232 metals tariffs at 50 percent on steel, aluminum, and copper are not affected by that proclamation, meaning the primary pressure on structural materials continues.

The second driver is the Iran war's effect on global oil markets. ENR's analysis notes the Iran conflict's impact on oil prices as the primary variable driving the energy-input surge, with diesel fuel up 73.8 percent year over year as of the June 1 ENR cost index update — and that surge has not yet fully worked through the supply chain. Asphalt, logistics costs, and all energy-intensive materials will continue to feel downstream effects through summer.

The margin gap this creates is significant. BLS PPI data shows that inputs to new nonresidential construction are up 6.6 percent year over year, while the PPI for new nonresidential building construction — what contractors say they would charge to build a fixed set of buildings — is up only 3.6 percent. The gap indicates contractors are absorbing roughly half of recent material cost increases rather than passing them through, leading to industry-wide margin compression that cannot persist indefinitely.

Who Is Most Exposed

The cost pressure is not uniform across trades. Heavy civil, road, and utility contractors face the steepest exposure through the diesel and asphalt spikes. Structural steel, mechanical, and electrical contractors absorb the Section 232 metals impact directly, with copper-heavy electrical scopes — data center cabling, distribution systems, MEP infrastructure — feeling the most concentrated pressure. Residential framers face 10 percent softwood lumber tariffs on top of broader input cost increases.

DPR Construction's Q2 2026 market report identifies growing cost pressure tied to tariffs, transportation disruption, and energy markets, affecting structural steel, aluminum, copper, rebar, roofing systems, and HVAC equipment across healthcare, advanced manufacturing, and data center projects. DPR also flags ocean freight disruptions and congestion at global ports as extending delivery timelines and increasing logistics costs — adding schedule risk on top of cost risk.

The Bid-Price Gap and What Comes Next

The gap between rising input costs and flat bid prices is the industry's core financial problem entering the second half of 2026. AGC's Director of Market Insights Macrina Wilkins has stated directly: "That gap is making it increasingly difficult for contractors to accurately price projects and raising the risk of delays, redesigns and deferred construction activity if cost volatility persists."

The practical implications for project planning and contracting are clear. Bids prepared using cost assumptions from six to twelve months ago are likely understated. Simonson advises that contractors hoping the spike fades by Q4 2026 should plan for the opposite — and that escalation clauses tied to verifiable indices should be negotiated into new contracts wherever possible.

A Strategic Response for Owners and Contractors

For owners, the risk of deferred or canceled projects is real. AIA's Richard Branch identifies insufficient budgets and financing issues as among the top four causes of project delays and cancellations in 2026 — and those dynamics are worsening as material costs rise. Early-stage budgeting must account for a construction cost environment running 6.6 to 7.4 percent above prior-year levels, with no near-term relief expected from the primary tariff or energy drivers.

For contractors, the immediate priorities are:

• Model current diesel, asphalt, copper, steel, and aluminum prices — not trailing averages — into active bids
• Use escalation clauses tied to verifiable producer price indices on all projects expected to span more than 12 months
• Hold experienced crews even at a premium — the cost of turnover in a tight labor market exceeds short-term payroll savings
• Segregate material procurement for price-exposed items with locked-in purchase orders wherever feasible

The cost environment of summer 2026 is not a temporary anomaly. It is the product of structural tariff policy, energy market disruption, and years of underinvestment in domestic materials production capacity converging simultaneously. Contractors and owners who plan around these realities — rather than hoping for relief — will be better positioned to deliver projects on time and on budget through the year's second half.

Sources

• ConstructConnect: What Construction Experts Are Warning About the Industry (June 4, 2026)
• Construction Dive: Construction Prices Surged in April, Up 6.2% Year to Date (May 14, 2026)
• ENR Construction Economics June 1 via Contractor+ (May 29, 2026)
• DPR Q2 2026 Report via Construction Owners Association (May 22, 2026)
• KPMG US: Construction Spending Quietly Stalls (June 1, 2026)