Inputs to Construction Industries: Tracking the PPI for Bids
Preparing accurate trade estimates requires tracking broad material pricing benchmarks rather than relying solely on past invoices. The latest commodity figures from the U.S. Bureau of Labor Statistics Producer Price Index provide commercial trade contractors, drywall crews, framers, and builders with an objective view of price movements across construction inputs. Here is what the numbers demonstrate through September 2026 and how estimators can apply these trends when assembling numbers and contractual terms.
Key Findings from the September 2026 Data Release
The commodity index for inputs to construction industries, excluding capital investment, labor, and imports, registered at 172.2 in September 2026. This figure marks a 2.1% increase compared to August 2026, when the index stood at 168.7. Over a twelve-month span, the benchmark moved up from 154.2 in September 2025, which reflects an 11.7% increase. When evaluating the longer term, the current mark represents a 15.1% rise relative to September 2024, when the series was at 149.6.
Estimators should note that these monthly figures are not seasonally adjusted. In addition, recent monthly data points remain preliminary and are subject to revision for four months following their initial publication by the U.S. Bureau of Labor Statistics.
Data Brief: Baseline and Multi-Year Trajectory
Tracking the broader trendline helps estimators gauge where material pricing sits within historical ranges. The lowest monthly measurement within the January 2016 to September 2026 observation window occurred in February 2016 at 97.5. In contrast, the level of 172.2 recorded in September 2026 stands as the highest monthly figure across that entire period. Against the pre-pandemic level of 110.7 recorded in January 2020, the overall index has risen 55.6%.
| Reference Point | Index Value | Percent Change to Latest |
|---|---|---|
| Latest Month (September 2026) | 172.2 | +0.0% |
| One Year Earlier (September 2025) | 154.2 | +11.7% |
| Five Years Earlier (September 2021) | 134.8 | +27.8% |
| Pre-Pandemic Baseline (January 2020) | 110.7 | +55.6% |
| Window High (September 2026) | 172.2 | +0.0% |
Thirteen-Month Progression from 2025 Through 2026
Examining month-by-month changes reveals how cost patterns developed across late 2025 and 2026. The index held relatively steady in late 2025, moving from 154.2 in September 2025 to 154.3 in October, 154.7 in November, and 154.6 in December. The annual average for 2025 finished at 153.6.
Entering 2026, values climbed steadily. The index reached 155.9 in January, 157.3 in February, 160.3 in March, and 162.7 in April. Upward movement continued into May at 165.7. Values flattened temporarily through June at 165.6 and July at 165.6 before climbing to 168.7 in August and 172.2 in September. For the January-through-September period of 2026, the calculated average sits at 163.8, standing noticeably above historical annual averages such as 149.1 in 2023, 150.4 in 2024, and 151.5 in 2022.
Applying Input Trends to Project Estimates
Because the index captures broad trade inputs without labor or capital investment, estimators can use it as a sanity check against material vendor quotes. When supplier commitments have short acceptance windows, carrying unhedged unit rates creates vulnerability. Estimators frequently coordinate with internal teams to evaluate risk buffers, as discussed in Estimating Contingency: How Much to Carry and Where It Belongs.
Because recent monthly data remains subject to BLS revision for four months, estimators should avoid relying on a single month to project extended future job costs. Instead, review the broader annual averages, which rose from 99.0 in 2016, 102.6 in 2017, 108.7 in 2018, 110.0 in 2019, 111.4 in 2020, and 132.3 in 2021.
Structuring Material Price Escalation Clauses
When working under fixed-sum proposals, trade contractors use price escalation clauses to address shifting procurement costs. For helpful guidance on proposal language, consult Bid Exclusions and Clarifications: How to Write a Proposal That Protects You. When incorporating the Producer Price Index into contract adjustment terms, estimators should spell out the following parameters:
- The exact series name: Inputs to construction industries, excluding capital investment, labor, and imports.
- The specific series code: WPUIP230000.
- The baseline reference month and index value matching the bid submission date.
- The handling of preliminary figures, accounting for the four-month revision window established by the BLS.
- The threshold percentage increase required before an adjustment takes effect.
Sources
U.S. Bureau of Labor Statistics, Producer Price Index Series WPUIP230000
Published October 28, 2026. No affiliate links on this page. Facts come from the sources linked above; check them for updates.