• US construction spending fell 1.9% in September, but private nonresidential construction rose 1.1%, driven by AI infrastructure.
  • Data center construction surged at a record 211% quarterly annualized pace, with monthly growth of 8–10% over the past four months.
  • Data centers now account for 4.3% of total construction spending, up from 2% in early 2025, as residential spending dropped 5.5%.

A Tale of Two Construction Markets

US construction spending took a step back in September, but the underlying story is one of divergence: while overall spending fell 1.9% to a seasonally adjusted annual rate of $2.186 trillion, down 2.7% from a year earlier, private nonresidential construction eked out a 1.1% gain—its fourth consecutive monthly increase. The decline, according to Reuters (TRI), was partly due to high materials costs weighing on residential renovation spending, which dropped 5.5%.

The headline number masks the real driver: data center construction is booming. According to the latest report, data center spending surged at a record 211% quarterly annualized pace, with monthly growth of 8–10% over the past four months. That eye-popping figure helped push data centers’ share of total construction spending to 4.3%, up from just 2% in early 2025.

Powering the AI Revolution

The data center boom is not just about buildings—it’s about power. Spending on power plants increased 1.2% in September, consistent with the expanding infrastructure needs surrounding the AI buildout. S&P Global (SPGI) identifies electricity availability, transmission capacity and grid-connection delays as major constraints, particularly in PJM markets—including Virginia, Ohio and Pennsylvania—and Texas’s ERCOT market. Developers increasingly face a choice between waiting for a connection, relocating, or building on-site generation.

This connects the construction story to a broader industrial shift: AI investment is driving demand not only for buildings and chips, but also for generation, transmission and cooling infrastructure. It can also complicate decarbonization where utilities extend coal operations or add gas-fired generation to meet demand.

A Narrow but Powerful Engine

The divergence predates September. A recent Stateline analysis of Census data found that annualized data-center construction had more than doubled over two years to roughly $85 billion by August, while other construction spending had fallen 8%. That suggests a structural shift in investment toward computing infrastructure, rather than merely a one-month statistical anomaly.

But the economic benefits are concentrated: construction contractors, electrical-equipment suppliers, utilities and data-center host communities gain investment opportunities. Yet dependence on one capital-intensive sector also creates vulnerability if expectations for AI profitability weaken. Economic Policy Institute chief economist Josh Bivens described the growth base as narrow and potentially fragile.

Spending Spree

Recent corporate spending illustrates the demand behind the construction boom. Alphabet (GOOGL), Google’s parent and a major cloud and AI provider, reported approximately $51.4 billion in third-quarter capital expenditure, more than double the year-earlier amount. CFO Anat Ashkenazi said more than one-third went to data centers. Microsoft (MSFT), a major enterprise-software, cloud and AI provider, reported quarterly spending of $45.2 billion, up 30% year over year. CEO Satya Nadella said it added 24 data centers across five continents during the quarter.

These are capital-expenditure figures, not profits, and they are not directly comparable with Census construction spending: corporate investment includes equipment and other assets beyond construction. Microsoft’s reported spending, for example, was heavily weighted toward short-lived assets.

Local Pushback and Political Hurdles

As the buildout accelerates, local approvals and cost allocation are becoming flashpoints. The political debate is shifting from simply attracting investment toward deciding who pays for its infrastructure requirements. Nevada reduced tax incentives and, under a September executive order from Governor Joe Lombardo, is seeking commitments that data centers cover their energy and water demands. Virginia introduced a data-center electricity-consumption surcharge in July while retaining important tax incentives. Axios reports that a Texas grid-connection audit and a New York pause on environmental permits for larger facilities are delaying projects.

These developments show why local zoning, utility regulation and state permitting can affect the pace of investment even when companies have financing available. The central policy question is whether existing residents and businesses should bear any of the grid-expansion costs created by very large new customers.

International and Market Implications

Internationally, S&P Global identifies advanced-chip export controls, particularly involving the United States and China, as an influence on hardware availability and the location of high-density AI facilities. Data-sovereignty and privacy requirements also encourage companies to build infrastructure within particular jurisdictions. Consequently, U.S. construction growth is part of a global competition shaped by both computing demand and national regulation.

The near-term outlook remains robust, but the headline’s extraordinary annualized rate should not be treated as a sustainable forecast. SemiAnalysis, cited by Axios, projects that the industry could add more than 50 gigawatts of capacity in 2027, with nearly half already at an advanced construction stage. That is an industry forecast—not completed capacity—and remains subject to grid, permitting and supply constraints.

The central uncertainty is therefore not whether construction is accelerating—it is whether utilization, revenues and supporting infrastructure can catch up with the commitments already being made. As Bivens put it, the growth base is narrow and potentially fragile.

Correction: November 3, 2026 — An earlier version of this article misstated the September construction spending figure. It fell 1.9% to $2.186 trillion, not $2.186 billion.