How to Use the Producer Price Index to Track Construction Material Costs — And Protect Your Bids
The federal government publishes detailed monthly data on what your materials actually cost. Here’s how to find it, read it, and use it.
Every contractor knows that material prices move. What fewer contractors do is track those movements systematically — using real data — before they go out on a bid or sign a long-term contract. The Producer Price Index, published monthly by the U.S. Bureau of Labor Statistics, is the most reliable free tool available for monitoring construction material cost trends. Here’s how to use it.
What Is the Producer Price Index?
The Producer Price Index — commonly called the PPI — measures the average change over time in the prices that domestic producers receive for their output. In plain terms: it tracks what materials cost at the producer level, before they reach the retailer or the jobsite. The BLS publishes PPI data for hundreds of specific industries and commodities, including the construction materials that matter most to Pacific Northwest contractors: lumber, steel, copper, concrete products, drywall, roofing materials, and more.
The PPI is different from the Consumer Price Index (CPI), which tracks prices that consumers pay at the retail level. The PPI tracks price changes closer to the source — making it a more useful leading indicator for contractor purchasing and bid planning.
Where to Find the Data
The BLS publishes PPI data at bls.gov/ppi. The data is updated monthly, typically within two to three weeks of the end of each reference month. It is completely free to access, no account required.
To find construction-specific data, navigate to the PPI Data Finder and search by commodity or industry. The most useful data series for construction contractors include:
Lumber and Wood Products — Series WPU08: Tracks price changes for softwood lumber, plywood, oriented strand board (OSB), and engineered wood products. Critical for residential framing and sheathing cost tracking.
Steel Mill Products — Series WPU101: Tracks hot-rolled bars, structural shapes, plates, and sheets. Essential for commercial and structural steel users.
Copper and Brass Mill Shapes — Series WPU102: Tracks copper pricing — critical for electrical and mechanical contractors.
Concrete Products — Series WPU1322: Tracks ready-mix concrete and precast products.
Gypsum Products — Series WPU1321: Tracks drywall and related products.
Asphalt Paving and Roofing Materials — Series WPU1323: Tracks roofing materials and paving products.
Construction Machinery and Equipment — Series PCU33312033312: Tracks equipment costs, useful for equipment-intensive contractors.
How to Read the Data
PPI data is expressed as an index number relative to a base period (currently 1982 = 100) and as a percentage change — month-over-month and year-over-year. The percentage change is the number you want to focus on.
Example: If the PPI for lumber shows a year-over-year change of +13%, that means lumber is costing producers — and ultimately contractors — 13% more than it did 12 months ago. If your bid from last year didn’t include a 13% lumber cost escalation, you may be bidding against your own historical numbers and losing margin without knowing it.
How to Use PPI Data in Your Business
1. Update your unit costs before every bid. Before you finalize material pricing on any significant bid, check the current PPI for your key materials. Compare the current index to the index from the last time you updated your pricing database. If lumber is up 13% and your pricing database was last updated 14 months ago, your lumber unit costs need to be revised before the bid goes out.
2. Build material escalation clauses into long-term contracts. For projects with construction schedules extending six months or more, use PPI data to justify and structure escalation clauses. A well-drafted escalation clause will reference specific PPI series by number, establish a threshold percentage change that triggers a price adjustment, and specify the calculation method — protecting you from absorbing cost increases that occur after bid but before procurement.
3. Track trends to anticipate future cost movements. The PPI isn’t just useful for current pricing — it’s a trend tool. If lumber PPI has risen three months in a row, that’s a signal to accelerate material procurement on current projects, locking in today’s prices before the next increase. If PPI is falling, that may be a reason to delay procurement and capture a lower price.
4. Use PPI data in change order negotiations. If a project runs long and material costs rise between bid and purchase, PPI data gives you documented, government-published evidence to support a change order request for material cost increases. It’s far more persuasive than a general claim that “prices went up.”
5. Compare PPI trends to your supplier quotes. If your supplier is raising prices significantly faster than the PPI for that commodity, you have data to push back — or to justify shopping for an alternative supplier.
A Practical Starting Point
Bookmark bls.gov/ppi and build a simple habit: on the first Monday of every month, check the PPI release for your three or four most important materials. Note the year-over-year change. If any material is moving more than 5% in either direction, factor that directly into your active bids and purchasing decisions.
In a market where copper and steel prices are up more than 20% year-over-year and lumber has swung dramatically in both directions over the past three years, contractors who track PPI data are operating with a meaningful informational advantage over those who don’t.
NW Construction News provides general business information only. Consult a qualified construction accountant or financial advisor for guidance specific to your business.
