What to Do When Material Costs Jump Mid Job

Read This First

You bid the job at a fixed price. Weeks later the supplier's invoice lands higher than your number, and the gap is coming straight out of your margin. If you are a small operator, this hits harder than it does the big shops. In the year ending July 2026, building material costs rose 6.7% overall, but builders who started five or fewer homes reported a median increase of 9.1%, versus 1.8% for builders with 100 or more starts.^[2] The small guy eats the biggest jumps. This is about not eating them alone.

The Small Shop Absorbs the Biggest Swings

Material cost volatility is not a rumor you are imagining. Iron and steel prices were up 9.2% year over year, and copper wire and cable jumped 13.8%, according to an August 2025 reading -- even as overall construction input prices rose a comparatively modest 2.3% to 2.6% over the same period.^[5] The gap shows how uneven this volatility is: a couple of categories move hard while the broader index stays calm. Those are the exact inputs that go into everyday electrical, plumbing, and structural work. The pressure is enough that about 43% of contractors reported at least one project in the past six months was canceled, postponed, or scaled back because of higher costs.^[5] Material costs were the number one concern for the trade in a 2022 industry survey, listed by 86% of contractors -- and nothing about the tariff and PPI activity since then suggests that's changed.^[1]

Here is the part that decides who pays. In a fixed-price contract with no escalation provision, the contractor generally bears the risk of material price increases that happen after signing.^[3] Unless your contract says otherwise, that swing is yours. And the most widely used standard forms, the American Institute of Architects Owner/Contractor agreements, don't include a general material-price-escalation clause that automatically shifts ordinary market increases to the owner.^[3][6] Sign a stock AIA form, buy late, and the increase is legally your problem.

The Clause That Decides Who Pays

A price escalation clause shifts the risk of material increases from you to the owner after the contract is signed.^[6] It is the single most direct tool for this, and it belongs in lump sum, fixed fee, or guaranteed maximum price contracts, especially longer or more complex jobs.^[6] These clauses come in three basic types: any-increase clauses that pass along every dollar, threshold clauses that only trigger once prices rise past a set point, and delay clauses tied to schedule slippage.^[7]

Because the standard AIA form leaves this out, you need to bring the language yourself. ConsensusDocs says it's the only publisher of standard construction contracts offering a ready-made version -- the ConsensusDocs 200.1 Material Price Escalation Amendment.^[4][6] If you want a ceiling that reassures a nervous owner, negotiate one directly into the clause -- a stated percentage or dollar cap on the owner's total exposure, agreed before either side needs it. The point is not to win an argument. It is to have the mechanism in writing before you need it, not after.

What to Change on the Job You're on Right Now

If the job is already underway and the contract has no escalation clause, don't assume a rising material cost alone gives you the right to issue a change order -- a change order generally requires the owner's authorization or a change the contract itself recognizes, not just a supplier price increase on your end. Your instrument, once you do have grounds, is the change order. A properly authorized change order can amend the original contract -- but the contract's own change-order procedures control whether a given document actually qualifies.^[8] Most construction contracts require written authorization for extras, and courts generally enforce that requirement.^[8] A verbal "yeah, go ahead" from the owner does not protect you.

Write it correctly. A defensible change order references the original contract, describes the specific change, breaks the price adjustment into labor and material, states the schedule impact in days, gives the revised contract total, and carries dated signature lines from both parties.^[8] Attach the supplier invoice showing the increase so the number is not your word against theirs. Include any markup, overhead, or administrative charge your contract actually allows, and show the owner exactly how you calculated the adjustment -- your number only holds up if the math behind it does.^[8]

Going forward, put an escalation clause in every fixed-price contract you sign, and watch the calendar on known cost drivers. The 10% global tariff expired July 24, 2026 -- and was immediately replaced for most trading partners by new 10% to 12.5% tariffs under a different statute, so don't read that expiration as relief.^[9] Specified steel, aluminum, copper, and derivative products separately face tariffs of up to 50%.^[4] Bid with those costs in mind, not against them.

Bottom Line

The default rule puts mid-job price jumps on you, and the standard AIA contract does nothing to change that. Put an escalation clause in the next contract, and if the owner agrees to cover this job's increase, document that agreement with a signed change order and the supplier invoice before you buy another dollar of material.

Sources

1. Associated General Contractors of America: 2021 materials price increase and 2022 contractor concern survey
2. NAHB: July 2026 building material price increases by builder size
3. Bell Davis Pitt: how general contractors can manage the risk of rising material costs
4. ConsensusDocs: price escalation clauses and current tariff schedule
5. Construction Dive: rising materials costs and producer price index data
6. Barley Snyder: using a price escalation clause in a construction contract
7. Maynard Nexsen: handling construction cost escalations due to tariffs and market forces
8. SubcontractorHub: construction change orders guide (2026)
9. Honigman: Section 301 forced-labor tariffs replacing the expired Section 122 global tariff, effective July 24, 2026