Material cost increase change order: getting paid in 2026

The industry is drowning in advice on how to buy materials cheaper in 2026. Buy early, lock in prices, hedge your steel. Almost none of it answers the question that actually decides whether you keep your margin: when the price of copper or lumber jumps after you have already signed a fixed price, who eats it, and how do you get paid for it?

That is not a procurement question. It is a contract, documentation and change order question, which happens to be the part of the business we think about most. We build SubTrade inside Quality Gypsum Services, a commercial drywall contractor in Calgary, Alberta, and we have watched more than one good job get quietly erased by a mid-project material spike nobody billed for. Here is how to make sure that increase becomes money you recover instead of margin you lose.

The 2026 cost picture, briefly

Construction input prices are climbing again. Overall construction input costs were up around 3.4 percent year over year heading into 2026, and the pain is concentrated in tariff-exposed metals. Over 2025, aluminum mill shapes rose roughly 30 percent, steel mill products around 17 percent, and copper and brass mill shapes nearly 12 percent, driven by Section 232 tariffs on steel, aluminum and copper. New tariffs on imported timber and lumber took effect in October 2025. Meanwhile bid prices have lagged input costs, rising only about 2.7 percent, which is exactly the squeeze that empties a subcontractor's margin.

The point is not to predict where prices go. Even industry economists have called 2026 input pricing exceptionally hard to forecast. The point is that buying smart only protects you until prices move after you have signed. After that, it is a money problem, and money problems are solved in the contract.

Where the risk actually lives in your contract

Before you can recover a price increase, you have to know who the contract already says should bear it.

Under a fixed price or lump sum subcontract, you carry the risk of cost increases. That is the entire logic of a lump sum: you named a number, and the gap between your estimate and your actual cost is yours to keep or to lose. Absent a clause that says otherwise, a mid-project spike is generally your problem.

Under a cost-plus arrangement, or a guaranteed maximum price with an escalation contingency, real cost changes pass through to the owner and your exposure is much smaller. Most trade subcontracts are fixed price, which is why the clauses that shift or share that risk matter so much.

Three provisions decide the outcome: a price escalation clause, if you negotiated one; a change order or change-in-law provision, which may open a path even without an escalation clause; and force majeure, which, as we will see, is the one people reach for and the one that almost never helps with price.

Price escalation clauses: the clean protection

The best time to solve a price increase is before it happens, in the contract. A price escalation clause adjusts the contract price when a defined cost benchmark moves. Done well, it protects both sides, and it usually runs both directions: the price goes up if materials spike and down if they fall.

There are three common ways to trigger one.

A threshold trigger only activates once a material's price rises past a stated point, for example any increase above 5 percent from the bid-date price. That keeps the owner from fielding adjustments over trivial swings while still protecting you from a real jump.

An index trigger pegs the adjustment to a published index rather than your own invoices, measured from the contract date to the purchase date. The Bureau of Labor Statistics Producer Price Index for the specific commodity is the usual reference, and there are construction cost indices as well. The key is to pick an index that actually tracks the material at issue: a copper series for electrical, a lumber series for framing.

An actual-cost trigger ties the adjustment to your documented invoices against a baseline. It is the most precise and the most paperwork.

You can also share the risk instead of putting it all on one party: you absorb the first few percent, then costs above that get split or fully reimbursed.

What to make the clause say

If you are negotiating an escalation clause, make it specify the materials it covers by name, the baseline price and the objective measure, whether steel, copper, aluminum, lumber or gypsum board and steel studs, so nobody argues later. Name the trigger threshold and whether it is measured per item or across the whole material bill. Spell out how the adjustment is calculated and how it becomes a change order. Pin down any cap and whether it runs one way or both. And tie in a time extension right, because a tariff or shortage that raises your cost often also delays your delivery.

Watch the cap. A ceiling protects the buyer, and in a volatile market an overly tight cap on your escalation can leave you exposed even with a clause in place.

Force majeure will not save your price

This is the most common and most expensive misunderstanding, so it is worth being blunt. A force majeure clause typically excuses delay or non-performance caused by events outside your control, and it usually grants more time. It does not grant more money. It generally does not cover a pure cost increase, and it is legally unsettled whether a tariff even counts as a force majeure event at all. Do not build your recovery plan on force majeure. It is a schedule remedy, not a price remedy.

When there is no escalation clause: the change order path

Most subcontractors reading this do not have an escalation clause on their current jobs. Recovery is harder without one, but it is not hopeless, and it runs through the change order.

Some contracts include a change-in-law or equitable adjustment provision that allows an adjustment for taxes or tariffs enacted after the contract date. Whether a specific new tariff qualifies is arguable and depends on the wording, but it is the first place to look. Beyond that, the legal doctrines people reach for, commercial impracticability and mutual mistake, are genuinely hard to win, especially when the contract already put the risk on you. Treat them as last resorts, not a plan.

The realistic path is to document the increase so thoroughly that it becomes a change order your general contractor approves rather than a claim you have to fight. A material cost increase becomes recoverable the same way any unsigned change order does: with a clean, dated paper trail and notice given on time.

The documentation that gets you paid

An owner or GC will not take your word for a price jump. They will ask you to prove it, and the contractors who get paid are the ones who assembled the proof before they were asked.

Keep the dated supplier quote from bid or contract time next to the current quote, so the before-and-after is undeniable. Keep the dated purchase orders and invoices showing the actual increase you paid. Pull the relevant published index for the commodity to show the increase is market-wide and not your inefficiency. Send written notice to the GC describing the increase and its cause. Keep delivery records and photos tying the material to this project. That package, assembled the day the cost lands, is what converts a price spike into a billable, defensible change.

The trade you are in tells you where to watch. Electrical crews feel copper first. HVAC and plumbing feel copper, aluminum and steel across ductwork, coils and fittings. Framing feels lumber and fabricated steel. Drywall feels it through steel studs, track and fasteners more than the board itself. Whatever your trade, the exposed materials are the ones your escalation clause should name and your documentation should track.

The notice deadline is the claim killer

Here is the single most common way a legitimate cost-increase claim dies: the subcontractor misses the notice window. Nearly every subcontract sets a written notice deadline for changes and claims, often measured in days from when you knew or should have known of the cost event. Miss it, and an otherwise valid claim can be waived and lost no matter how strong your documentation is.

So give notice as soon as you identify the increase, and never later than the contract deadline. Put the notice requirements from every active contract somewhere you will actually see them, because the value of your paper trail drops to zero if you hand it over a week after the window closed.

Track it or lose it

The quiet way material inflation kills a job is that nobody notices until closeout. The estimate said one number, the actuals crept past it week by week, and by the time anyone runs the comparison the money is gone and the notice deadlines are blown. Catching cost drift early is a job-costing discipline: compare committed and actual material costs against the estimate as the job runs, not after it ends. When your job costing flags a line running hot in week three, you still have time to issue notice, document the increase, and bill it. In week thirty, you are just measuring the loss.

That is the whole case for handling this in a system instead of a spreadsheet. Logging the change the day the cost hits, attaching the quotes and photos, and tracking it against your estimate is exactly what change order management built for subs is supposed to do, and it ties straight into how you bill progress. SubTrade starts at $299/month CAD with a 14-day free trial and no credit card required.

FAQ

Who pays for material price increases during a construction project?

It depends on the contract. Under a fixed price or lump sum subcontract, the subcontractor generally bears the risk of cost increases unless a price escalation clause or a change-in-law provision shifts it. Under cost-plus contracts, real cost changes usually pass through to the owner. The clause you negotiated up front, or did not, decides who eats a mid-project spike.

What is a price escalation clause?

It is a contract provision that adjusts the contract price when a defined material cost benchmark moves, often measured against a published index or documented invoices from a baseline date. It usually works both directions and can include a threshold before it triggers and a cap on the total adjustment. It is the cleanest way for a subcontractor to protect against price volatility.

Can I get a change order for a material cost increase?

Sometimes, and it is far more likely if you document it well and give notice on time. A change-in-law or equitable adjustment clause may cover tariffs or taxes enacted after the contract date. Even without one, a thoroughly documented increase, dated quotes, invoices, the relevant index and timely written notice, can be approved as a change order rather than fought as a claim.

Does force majeure cover material price increases?

Usually not. Force majeure clauses typically excuse delay and grant more time, but they do not grant more money, and they generally do not cover pure cost increases. It is not even settled that a tariff qualifies as a force majeure event. Do not rely on force majeure to recover a price spike; it is a schedule remedy.

What documentation do I need to recover a material cost increase?

Dated supplier quotes from bid time and current quotes showing the before and after, dated purchase orders and invoices proving what you actually paid, the published commodity index confirming the increase is market-wide, written notice to the GC describing the increase and its cause, and delivery records or photos tying the material to the project. Assemble it the day the cost hits, not when someone asks.

How do I avoid losing a cost-increase claim on a technicality?

Give written notice within your contract's deadline. Missing the notice window is the most common way a valid claim is waived, regardless of how good your documentation is. Track the notice requirements for every active contract, and pair on-time notice with a complete, dated paper trail.