U.S. construction spending fell 1.9% in September, marking the sharpest monthly decline in more than a year as residential investment dropped 5.5% amid persistent high material costs and rising mortgage rates. The September retreat interrupted what had been a modest recovery earlier in the quarter, with total construction spending reaching a seasonally adjusted annual rate of $2.13 trillion, according to the latest Census Bureau data.
The residential construction slowdown was the primary driver of September's overall decline, with homebuilding and remodeling activity both pulling back as affordability pressures intensified. Meanwhile, select nonresidential sectors including data centers, power infrastructure, and manufacturing continued to show strength, preventing an even steeper overall contraction.
For contractors, excavators, and material suppliers, the September data underscores a market increasingly defined by divergent trends: residential weakness versus infrastructure and industrial resilience. Understanding why US construction spending fell in September 2026—and which sectors remain viable—will be critical for businesses planning project pipelines and managing inventory through the coming months.
Breaking Down the Residential Construction Spending Decline
The 5.5% drop in residential construction spending represents the steepest monthly decline since early 2023, reflecting a combination of demand-side constraints and supply-side cost pressures that are squeezing both new construction and renovation activity.
Single-family construction spending remained essentially flat month-over-month, a misleading stability that masks deeper problems. While new single-family home construction held steady in markets with strong job growth and limited inventory, single-family renovation and remodeling activity fell sharply. This distinction is important: new construction tends to have committed financing and longer lead times, while discretionary remodeling projects are quickly shelved when mortgage rates rise and material costs remain elevated.
Multifamily construction spending declined 3.2% in September, continuing a trend that began in mid-2025 as developers responded to softening rental demand and tighter construction lending standards. Multifamily projects account for substantial excavation, site work, and fill dirt demand, and the pullback is already affecting contractors in high-growth metros where apartment construction had been robust.
The divergence between new construction and remodeling explains why residential spending fell 5.5% while single-family spending was flat month over month. Homeowners facing 7%+ mortgage rates are deferring kitchen upgrades, basement finishing, and additions—projects that would otherwise generate demand for excavation material, grading, and site preparation services.
How High Material Costs Are Affecting Residential Construction
Construction material costs remain a primary constraint on residential activity, even as some categories have retreated from 2024 peaks. September data shows that while lumber prices have stabilized and concrete costs have moderated slightly, labor-intensive inputs and specialty materials continue to pressure project budgets.
Key material cost dynamics affecting residential construction include:
- Concrete and aggregates: Ready-mix concrete prices remain elevated due to energy costs and regional supply constraints, particularly affecting foundation work and site development
- Asphalt: Paving and site work costs are up year-over-year as crude oil prices firmed in the third quarter
- Steel and rebar: Reinforcement costs have declined modestly but remain well above pre-pandemic levels, squeezing margins on foundation and structural work
- Labor: Skilled trade shortages continue to drive wage inflation, with residential framers, concrete finishers, and excavation operators commanding premium rates in competitive markets
For contractors working with fill dirt, dump sites, and excavation material, the September slowdown has mixed implications. Residential site work has softened, reducing demand for grading, cut-and-fill operations, and topsoil. However, material hauling rates have remained firm due to fuel costs and driver availability, preventing a sharp decline in per-load economics even as project volumes ease.
The material cost environment is also reshaping project pricing and bid margins. General contractors are building larger contingencies into estimates, and many are requiring material cost escalation clauses for projects with timelines extending into 2027. This caution reflects uncertainty about whether current material prices represent a temporary plateau or a new baseline.
Residential Construction Spending Decline Amid Rising Mortgage Rates
Mortgage rates have emerged as the dominant headwind for residential construction, with the average 30-year fixed rate hovering near 7.2% in September—up from 6.1% at the start of 2026. This 110-basis-point increase has significantly reduced housing affordability and dampened both new home sales and the home equity extraction that typically funds renovation projects.
The mortgage rate impact operates through multiple channels. First, higher rates directly reduce the pool of qualified buyers, forcing builders to slow production and offer incentives. Second, existing homeowners face a "lock-in effect," unwilling to trade a 3% or 4% mortgage for a 7% loan, which suppresses move-up buyer activity and the renovation spending that typically accompanies home purchases. Third, rising rates increase the cost of construction and development financing, squeezing developer returns and leading to project deferrals.
September's residential construction spending decline reflects all three dynamics. Builder sentiment has weakened, permits for single-family homes fell 2.1% month-over-month, and remodeling contractors report a growing number of postponed or scaled-back projects. The National Association of Home Builders' Remodeling Market Index dropped six points in September, with contractors citing client concerns about financing costs and economic uncertainty.
The question for contractors is whether the September decline represents a temporary reversal or the start of a broader construction slowdown. Forward indicators are mixed: while mortgage rates remain elevated, housing inventory is still constrained in many markets, and household formation among millennials continues to support baseline demand. The consensus among industry analysts is that residential construction will remain under pressure through early 2027, with a potential recovery in the second half if the Federal Reserve begins cutting rates as inflation moderates.
Nonresidential Strength Limits Overall Construction Spending Decline
While residential investment drove September's overall decline, select nonresidential categories demonstrated resilience and in some cases posted gains. This divergence highlights the two-speed construction economy that has characterized 2026: residential weakness offset by strength in infrastructure, industrial, and technology-driven sectors.
Data center construction continued to expand in September, supported by AI infrastructure investment and cloud computing demand. These projects involve substantial site work, including excavation for backup power systems, cooling infrastructure, and utility connections—creating ongoing opportunities for earthwork contractors even as residential site work softens.
Power infrastructure spending rose modestly, reflecting grid modernization projects, renewable energy installations, and electrical transmission upgrades. These initiatives often require extensive excavation, trenching, and material management, providing a partial offset to residential excavation declines.
Manufacturing construction remained positive year-over-year, buoyed by reshoring trends and federal incentives for semiconductor and battery production facilities. Large industrial projects typically involve multi-month site preparation, cut-and-fill operations, and significant volumes of excavation material movement.
Office construction showed surprising stability in September, with adaptive reuse projects and build-to-suit developments supporting activity in select markets. However, speculative office construction remains deeply depressed, and the office sector's overall contribution to construction spending continues to decline year-over-year.
Public construction spending edged higher, supported by infrastructure bill funding for highways, bridges, and water systems. These projects are generating steady demand for aggregates, fill dirt, and excavation services, though procurement timelines and permitting delays continue to slow the translation of appropriations into active construction.
For contractors and material suppliers, the nonresidential mix offers strategic opportunities to diversify revenue sources as residential activity moderates. Firms with capabilities in industrial site work, utility construction, or infrastructure projects are better positioned to navigate the current environment than those solely dependent on residential excavation and grading.
What Contractors Should Watch Next
The September construction spending data raises important questions about project pipelines, pricing dynamics, and business strategy for the remainder of 2026 and into 2027. Several indicators will help contractors gauge whether residential weakness will deepen, stabilize, or reverse:
Mortgage rate trajectory: Further increases would likely intensify residential pressure, while rate stabilization or modest declines could support a first-half 2027 recovery. The Federal Reserve's policy decisions and inflation data will be key drivers.
Housing permits and starts: These leading indicators typically precede construction spending by several months. September permits fell, suggesting near-term residential spending may remain soft, but sustained permit growth would signal improving conditions ahead.
Construction material price trends: Continued moderation in concrete, asphalt, and steel costs would improve project economics and potentially unlock deferred projects. Monthly producer price data and regional ready-mix quotes provide real-time visibility.
Renovation and remodeling sentiment: Trade association surveys and contractor backlog data offer insight into whether the September remodeling pullback represents a temporary pause or a more sustained retreat. Home equity levels and consumer confidence also influence renovation spending.
Nonresidential backlog: Architecture billings indices, engineering firm workload, and public letting schedules indicate the strength of the nonresidential pipeline and whether infrastructure and industrial sectors can sustain current momentum.
For excavation contractors, material haulers, and dump site operators, the September data suggests a need for tactical adjustments: cultivating relationships with nonresidential developers and infrastructure general contractors, maintaining pricing discipline despite volume softness, and managing equipment and labor costs to preserve margins during a period of mixed demand signals.
The 1.9% overall decline and 5.5% residential drop are significant, but they don't yet constitute a construction recession. September's weakness appears driven by specific headwinds—high material costs and rising mortgage rates—rather than a broad economic contraction. Whether the decline proves temporary or marks the beginning of a longer slowdown will depend on interest rate policy, material cost trends, and the resilience of infrastructure and industrial investment. Contractors who understand these dynamics and position accordingly will be best prepared for whatever the next quarter brings.