Seven out of ten U.S. home builders say they cannot put a confident price tag on a new house right now. The reason is brutally simple: they have no idea what their materials will cost by the time the foundation is poured.
That finding comes from special questions included in the April 2026 NAHB/Wells Fargo Housing Market Index survey, which also revealed that 62% of builders reported their suppliers had already raised material prices, pointing directly at higher gas and diesel costs as the driver. For anyone shopping for new construction this summer, the numbers explain why quotes keep changing and why some projects aren’t breaking ground at all.
Federal data back the builders up. NAHB economists, drawing on the Bureau of Labor Statistics’ Producer Price Index program, calculated that residential building materials (excluding energy) climbed 3.7% year over year in April 2026, one of the sharpest annual increases in recent memory. For context, the BLS Consumer Price Index showed overall inflation running at roughly 2.4% year over year during the same period, meaning construction materials were rising more than a full percentage point faster than the broader price level. Layer that on top of mortgage rates that have stayed above 6% through the spring, according to Freddie Mac’s Primary Mortgage Market Survey, and the pricing fog inside the construction industry becomes one more barrier between buyers and a new home.
Diesel is the thread that runs through every delivery
The connection between fuel and building costs is physical, not abstract. Diesel powers the trucks hauling lumber from Pacific Northwest mills, the flatbeds delivering steel beams from fabrication plants, and the mixers pouring concrete on site. When diesel climbs, suppliers face higher freight bills on every shipment, and the April NAHB survey shows a clear majority of builders hearing the same message from their vendors: “We’re charging more because it costs more to move the product to you.”
The U.S. Energy Information Administration’s weekly retail diesel data showed national on-highway diesel averaging above $3.80 per gallon through much of spring 2026, elevated enough to squeeze margins across freight-dependent industries. The Associated General Contractors of America, in its own analysis of BLS releases, flagged sharp gains in diesel fuel and transportation services costs during the same period and warned that the volatility could force contractors to either absorb the hit or pass it along to project owners and, ultimately, buyers.
What the NAHB survey does not reveal is which materials are getting marked up the most. Lumber, steel, concrete, and gypsum each travel through different supply chains with different levels of exposure to freight costs. The direction of the pressure is clear; the magnitude, material by material, is not.
Why builders can’t set a price and stick to it
Pricing a new home has always involved some forecasting, but the current environment has stretched the guesswork to an unusual degree. The 70% figure from the NAHB survey reflects builders who reported serious challenges setting prices — the survey’s own framing for the inability to forecast where input costs are heading. (The NAHB described these respondents as facing “serious challenges” in pricing; whether that phrase appeared verbatim on the questionnaire or is the association’s summary is not specified in the published results.) In practical terms, that translates to wider cost buffers baked into contracts, more frequent use of escalation clauses, and, in some cases, builders simply shelving projects until the picture clears.
Picture a mid-size builder in the Dallas-Fort Worth metro planning a 40-lot subdivision. To break ground in June 2026, that builder needs to lock in framing lumber, concrete, and roofing materials months in advance. If diesel-driven freight surcharges push lumber delivery costs up 5% between the bid date and the pour date, the margin on each home shrinks before a single wall goes up. Across 40 lots, the math forces a choice: pad every contract with a larger contingency, add an escalation clause that shifts risk to the buyer, or wait. That scenario is illustrative, not drawn from a named company’s books, but it mirrors the dilemma the survey results describe at scale.
Fuel is only part of the fog. Active tariffs on imported building materials, including duties on Canadian softwood lumber and levies on certain steel and aluminum products, add another layer of unpredictability. A builder trying to lock in framing lumber for a subdivision three months out has to guess not only where diesel will be but also whether trade policy will shift the cost of the wood itself. The NAHB survey did not isolate tariff effects from fuel effects, but both pressures feed into the same inability to quote a firm number.
How solid are these numbers?
The BLS Producer Price Index is collected through standardized methodology, published on a regular schedule by the U.S. Department of Labor, and available for independent verification through tools like the agency’s Top Picks data portal. When NAHB economists report a 3.7% year-over-year increase in residential building materials, they are applying their own categorization to raw PPI series, not citing a standalone BLS headline. The underlying data are solid; the specific percentage reflects a trade-group calculation layered on top of government numbers.
The HMI survey itself has tracked builder sentiment monthly for decades. The special questions about fuel-driven price increases and pricing uncertainty were appended to the April 2026 wave. The association did not publish the number of respondents or a margin of error for these questions, so the 62% and 70% figures are best read as strong directional indicators from a credible industry sample rather than precision estimates. When both the federal price data and the industry survey point in the same direction, the combined signal carries more weight than either source alone.
What buyers should expect this summer
If you’re considering new construction in mid-2026, a few things are likely. Fixed-price contracts may come with larger contingency buffers than they did a year ago, or builders may push for escalation clauses that allow the final price to adjust if material costs move sharply before closing. Allowances for finishes and fixtures could also tighten as builders try to protect their margins on the structural side of the budget.
None of this guarantees that new-home prices will spike. If broader economic conditions soften and buyer demand pulls back, builders may eat some of the higher input costs rather than lose sales. Several publicly traded builders have already increased incentive spending in recent quarters to keep traffic moving through model homes. But the pricing uncertainty documented in the April survey means the range of possible outcomes is wider than usual, and that ambiguity tends to slow the pace of new construction rather than speed it up.
How energy shocks ripple from the fuel pump to the permit office
For anyone watching housing supply, the data trace a feedback loop worth tracking closely: energy price shocks ripple through freight costs, inflate material prices, cloud builder pricing, and ultimately discourage the kind of speculative building that adds inventory to a market that still needs it. The National Association of Realtors has repeatedly cited a shortfall of millions of housing units nationwide, a gap that only closes when builders feel confident enough to start new projects.
Whether that loop tightens or loosens over the rest of 2026 depends on where fuel costs settle, how tariff policy evolves, and whether demand stays strong enough to justify building through the uncertainty. Right now, the builders closest to the problem are telling us they can’t see far enough ahead to commit. That alone should tell buyers, lenders, and local officials everything they need to know about the months ahead.
