Construction Cost Escalation and Tariffs in 2026: What's Actually Driving Your Numbers Up

Why an Estimate From Last Month Doesn't Match Today's Quote

Here's what's actually happening. Section 232 tariffs on steel and aluminum are at 50%. Copper got added to that list this year, also at 50%. There's a 10% global tariff under Section 122 that's been running through most of 2026. And Canadian softwood lumber, already carrying antidumping and countervailing duties north of 30%, picked up an additional Section 232 tariff that pushes the combined rate toward 45% on a lot of shipments.

None of that is abstract policy talk. It's rebar. It's ductwork. It's copper wire and plumbing rough-in. It's the framing lumber sitting in the yard right now, priced differently than it was when you last pulled a quote. The ENR Building Cost Index is up somewhere around 4% year over year, and nonresidential construction input prices have been running close to 7% annualized. That's not a rounding error on a bid.

Kitchen cabinets and vanities picked up a 25% tariff too, set to run through January 1, 2027. Electrical distribution equipment, transformers especially, is dealing with both higher cost and longer lead times, and that combination is arguably worse than the tariff itself. A transformer that used to show up in six weeks is now a scheduling headache on top of a pricing headache.

Which Materials Are Actually Getting Hit, and By How Much

Not every trade is feeling this the same way. Some line items barely moved. Others jumped hard enough to blow up a bid margin overnight.

Steel and aluminum. 50% under Section 232. Structural steel, rebar, metal studs, roofing panels, curtain wall systems, all of it.

Copper. Also 50%. This one hits harder than people expect because copper touches almost every trade, electrical, plumbing, HVAC, even some finish hardware.

Lumber. Canadian softwood duties combined are pushing toward 45% on a lot of product. Framing, sheathing, trim, all of it runs through this.

Cabinets and vanities. 25% through the start of 2027. Residential and hospitality projects feel this one the most.

Electrical gear. Transformers, switchgear, distribution equipment. Cost is up, but the bigger issue right now is lead time.

Metals and controls typically run 20 to 30% of hard costs on a commercial construction estimating job. When that slice of the budget moves 10 to 15%, it's not unusual to see 3 to 5% added to the total project cost. On a $2 million build, that's real money. Six figures, sometimes. If you want a closer look at where those dollars actually go, our breakdown of material cost estimation walks through how pricing moves from raw material to line item.

How This Actually Shows Up in a Bid

This is the part that catches contractors off guard. You price a job using unit costs from three months back, everything looks fine on paper, and then the actual material quote lands 12% higher than what you built into the estimate. Sound familiar? Now you're either eating the difference or going back to the owner mid-project to explain why the number changed. Neither conversation is fun.

We're seeing more general contractors report at least one project this year that got scaled back or outright cancelled because a material quote blew past what the budget could absorb. That's not a small-contractor problem either. It's happening on commercial jobs with real financing behind them.

The old habit of pulling last quarter's pricing and adjusting it a little for "market conditions" doesn't hold up in a market moving this fast. Tariff rates have changed multiple times in the last year (steel alone has seen adjustments more than once since Section 232 took effect). Waiting even a few weeks to lock in a number can mean pricing off data that's already stale.

We hear the same story on a lot of intake calls. A GC pulled numbers off an old spreadsheet, submitted the bid, won it, and then got hit with a supplier quote that didn't match anywhere close. That gap has to come from somewhere, and it's usually the contractor's margin. Getting ahead of it, rather than reducing cost overruns after they've already happened, is the whole game right now.

A takeoff built on this week's material pricing catches a tariff problem before it becomes a change order fight. A takeoff built on last quarter's spreadsheet doesn't.

Why Escalation Clauses Went From Optional to Standard

Two years ago, a lot of owners pushed back hard on price escalation language. Now most of them expect it, because everyone's watched a project get squeezed by a tariff announcement nobody saw coming.

A basic escalation clause ties material pricing to a published index, ENR's index or a relevant PPI series, and adjusts the contract price if that index moves past an agreed threshold. Some contracts now go further and name tariffs specifically, spelling out that a new or increased tariff on a listed material triggers a price adjustment rather than forcing a fight over "unforeseen circumstances" language later.

Getting this right matters more than most GCs assume. A clause with a vague trigger or no cap protects nobody. A clause that's too narrow misses the next surprise. The contractors handling this well are the ones pricing escalation risk into the bid itself, not hoping it never comes up.

What Contractors Are Actually Doing to Protect Their Margins

A few patterns keep showing up with the GCs and subs handling this well. Wondering which of these you're already doing and which you're skipping?

Locking in materials early. Buying steel, copper, or transformers ahead of when the project actually needs them, sometimes months ahead, to freeze the price before the next tariff move.

Building real relationships with suppliers. Contractors with established supplier relationships are getting better allocation and more honest pricing than the ones shopping every job cold.

Looking at alternative materials or methods. Not always possible, but worth checking on a job-by-job basis. Some assemblies have substitution options that dodge the worst-hit tariff categories.

Communicating early with owners. The GCs having the "your number might move" conversation at contract signing, not three months in, are having a much easier time when it actually happens.

Getting numbers rechecked before pricing goes out the door. This is the one that gets skipped the most, and it's the cheapest fix. A takeoff and estimate built on this week's material pricing, not a spreadsheet from Q1, catches a lot of this before it becomes a change order fight.

None of these strategies work in isolation. Locking in materials early does nothing if the underlying estimate was wrong to begin with. Escalation clauses only protect you if they're written around numbers that reflected reality when the contract got signed. It all comes back to starting with an accurate number, not backfilling one after the fact.

Getting a Bid-Ready Number in a Market Like This

Look, none of this means every project is in trouble! It means the estimate has to actually reflect where pricing sits today, not where it sat when you built your last template. We track current RS Means data and material pricing alongside real tariff movement, so what you get back isn't a guess dressed up as a number. If you'd rather have a specialist run those numbers than build them in-house, our construction cost estimating services are built around exactly this problem.

Send your plans and we'll turn around a flat-fee estimate in 24 to 48 hours, priced off current market conditions, not last quarter's.

Frequently Asked Questions

Bottom Line

Tariffs aren't going away this year, and the contractors getting hurt worst are the ones bidding off stale numbers. Get an estimate that reflects this week's material pricing, not last quarter's, build escalation language into the contract, and lock in materials early where you can.

If you want that estimate to come from a team that lives in construction estimating services every day, send your plans over. We'll get back to you within 15 to 30 minutes and have a full, flat-fee number in your inbox in 24 to 48 hours.