Construction Materials Up 6.2% in Four Months: What It Does to Your Bids

The Producer Price Index data dropped on 13 May. It is not the kind of figure you skim past. Construction input prices rose 1.7% in April, with nonresidential up 1.8%, and the year-to-date increase now sits at 6.2%. Anirban Basu, the chief economist at Associated Builders and Contractors, put it bluntly: that four-month figure is bigger than the price escalation contractors absorbed across the prior three years combined.

For executives running tier-1 contractors and specialist subcontractors, this is not abstract. With nonresidential margins hovering around 2 to 3%, a 6% materials jump halfway through a fixed-price contract is the difference between a profitable job and a charge against the next one. And nobody got to bid in the prices we are now seeing.

The squeeze has three sources, all loaded onto contractor balance sheets at once. Tariff-affected materials, especially iron and steel, posted some of the steepest April increases. Energy ran hot across the board, with crude petroleum up 11.3% on the month. And the Federal Reserve, watching inflation that refuses to cool, is now expected to hold rates rather than cut, keeping financing costs heavy on projects already underwater on inputs.

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The 6.2% number, decoded

Why four months erased three years of price stability

The headline figure is striking on its own, but the composition matters more. April saw price increases across all three energy subcategories, with crude petroleum jumping 11.3%, unprocessed energy materials up 9.2%, and natural gas adding 4.9%. Energy flows through every materials category, from asphalt to plastics to the diesel running the equipment fleet.

Iron and steel posted the kind of monthly jumps that wreck quarterly forecasts. Basu attributed those increases directly to tariff exposure, and the timing lines up. The Trump administration restructured Section 232 metals tariffs in early April, with the new rules taking effect on the 6th. By the time the May PPI release captured the month, the new tariff regime had been in force for the back half of April. The 1.7% monthly rise reflects only the first wave of pass-through.

What worries Basu more than the April print is the rate trajectory. Construction input prices are running at a 12.6% annualised pace through early 2026, the fastest since 2022. That is not a one-off correction. That is a structural shift in input costs that bidders, owners, and surety underwriters are going to have to reprice around.

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Tariffs and the pass-through question

The new Section 232 maths, and who absorbs the bill

The 2 April proclamation changed how Section 232 tariffs on steel, aluminium, and copper get calculated. Articles made almost entirely of these metals, like steel coils and aluminium sheet, still face 50% on full value. The change with the longest tail is for derivative products. Previously the 50% rate applied only to embedded metal value, so a $1,000 piece of equipment with $200 of steel paid duty on $200. Under the new rules, a 25% tariff applies to the full $1,000 sales price.

The Cato Institute flagged this as a stealth increase dressed up as simplification, and contractors importing finished mechanical, electrical, and equipment packages are feeling it first. AGC updated its Tariff Resource Center on 2 April with guidance for renegotiating escalation clauses, which is the closest the industry has to an emergency response.

Pass-through is where this gets interesting commercially. On a lump-sum contract signed before April, the GC eats it unless an escalation clause was written tight enough to capture sudden tariff-driven jumps. Most were not. On cost-plus or guaranteed maximum price work, owners absorb more of the hit but push back hard on contingency draws. And subcontractors, particularly the steel erectors, MEP trades, and curtain wall specialists, are the ones holding the actual purchase orders. They are caught between fixed-price subcontracts and suppliers raising quotes weekly.

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Section 232: what changed in April

The new tariff base, side by side

Category	Pre-April tariff treatment	Post-6 April treatment
Articles made almost entirely of steel, aluminium, or copper	50% on full value	50% on full value (unchanged)
Derivative products substantially made of those metals	50% applied only to embedded metal value	25% applied to full sales price of the finished good
Metal-intensive industrial & electrical grid equipment	Variable rates	15% through 2027
Goods made abroad using US-origin steel, aluminium, or copper	Subject to standard rates	10%
Products with 15% or less metal content by weight	Subject to derivative tariffs	Exempt from Section 232
UK-origin derivative steel and aluminium	Standard rates applied	15% (concessionary rate)

Source: White House proclamation, 2 April 2026. Most contractors will feel the change through derivative products, where the tariff base shifted from embedded metal value to full finished-goods value.

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Bidding into a moving target

What 2 to 3% margins look like with 6% materials inflation

The arithmetic is unforgiving. If materials run 40 to 50% of a typical nonresidential project, a 6.2% materials jump translates to roughly 2.5 to 3 percentage points of total project cost. That is the entire margin. Contractors with stronger bargaining power, longer purchase agreements, or pre-bought inventory have some cushion. The rest are looking at jobs already in execution that will deliver at zero or negative margin.

The Joint Economic Committee’s analysis put hard numbers on residential exposure: copper and copper products were up 25% year over year by February 2026, and steel mill products including bars, wire, pipe, and plate were running well above 2025 baselines. The Brookings Institution estimated tariffs could add roughly $17,500 to the cost of a new US home, with $30 billion in additional sector-wide costs.

For bid teams, the practical response divides into three moves. First, escalation clauses written with tariff-specific triggers, not the generic CPI-based mechanisms that consistently underprotect. Second, shorter price validity periods on bids, which clients hate but estimators need. Third, pre-purchase agreements with suppliers locking material at award rather than fabrication. None of these are new ideas. They are now non-negotiable.

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The bifurcation nobody is talking about

Why backlogs look healthy even as costs spiral

ABC’s Construction Backlog Indicator hit 8.8 months in April, a 10-month high. That sounds reassuring until the breakdown lands. Contractors with more than $100 million in annual revenue carry backlogs 2.2 months longer than in April 2025. Every other size category, $50 to $100M, $30 to $50M, and under $30M, is reporting smaller backlogs than a year ago.

The driver is concentrated in one sector. 42% of the over-$100M contractors are under contract for data centre work, compared to just 7% of smaller firms. Data centre exposure carries a 12.2-month backlog versus 8.3 months for those without. That is the single largest split the industry has seen in years, and it shapes how materials inflation lands. Large contractors building hyperscale data centres for Meta, Google, Microsoft, and AWS have owner-side flexibility to negotiate cost adjustments. The smaller commercial GC building a regional fit-out on lump-sum terms does not.

According to Dustin DeVan, speaking on a recent Bricks, Bucks & Bytes episode, the tariff impact on construction input costs is one of the underrated stories of 2026, particularly because the Fed’s reluctance to cut rates compounds the financing pressure on top of materials inflation. For the contractors not riding the data centre wave, that combination is starting to define which firms make it through to 2027 intact.

The contractors winning right now are not necessarily smarter. They are sitting on the right backlog, with the right kind of client, on the right kind of project. For everyone else, the playbook is procurement discipline, contract surgery, and a hard look at which jobs are still worth bidding.

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