Ask a room of subcontractors where last year's profit went and half of them will point at change orders. Not the bid. Not the labor market. The extra work they performed between the original contract and the final invoice, priced in a hurry and paid on somebody else's terms.
Change order pricing is a separate discipline from base bid estimating. The base bid gets days of plan review. A change order gets hours, lands on a live job, and carries disruption costs the original bid never had. Price it like base bid work and you will lose money on every change. Here is how estimators who protect margin actually price them.
Why Change Orders Eat Subcontractor Margins
Three forces work against you on every change. First, the pricing window is short: the base bid gets a full takeoff and a second set of eyes, while a change order gets priced between phone calls. Second, the markup you may charge was decided months ago in the subcontract you signed, and most subs never read the cap clause until the first change lands.
Third, disruption. The original bid assumed an orderly sequence. A change order breaks it: remobilization, supervision, schedule compression, stacking trades, rework of finished work. None of that appears on a drawing, but all of it is real cost. Our 2026 estimating service pricing guide shows how professional fees account for hidden effort; your change order pricing has to do the same for your own work.
Read Your Subcontract Before You Price Anything
The single most important document in change order pricing is not your takeoff. It is the subcontract agreement you already signed. That is where your markup limits live, and they are tighter than most subs expect.
Typical change order markup caps in US subcontract agreements look like this:
| Cost category | Typical allowed markup (overhead + profit) | What it means in practice |
|---|---|---|
| Your own labor | 15% to 20% | Highest cap, since field labor carries your supervision and burden |
| Materials | 10% to 15% | Covers procurement, handling, storage, and price risk |
| Equipment | 10% to 15% | Owned or rented; owned rates should come from a published rental rate guide |
| Sub-tier pass-through | 5% to 10% | Your markup on your own subs; GCs often limit this further |
| Institutional / public work | 10% combined, sometimes less | Schools and municipalities frequently cap total markup in the contract |
Two things to take from this table. First, a 10% cap on paper rarely covers your true cost once estimating time, administration, and coordination are counted. Second, the time to negotiate these rates is at contract signing, not at change order number one.
Three Ways to Price a Change, and When Each One Fits
Every change order gets priced one of three ways. Picking the wrong method is how fair numbers turn into losing ones.
1. Lump sum change order
One fixed price for defined scope. Best when the change is fully drawn and specified. The advantage is speed and clean paperwork. The risk is yours: if you missed something in the revised detail, the lump sum does not grow. Use it only when you would bet your own money that the scope is complete.
2. Time and material (T&M)
Bill actual labor hours at pre-agreed loaded rates, plus materials at cost plus an agreed markup. Best for undefined or exploratory work: differing site conditions, concealed conditions behind demolition, owner-directed work with no drawings. It protects you from scope you cannot see yet, but only with two things in place: a signed rate schedule covering every labor classification you might use, and daily documentation tying hours to the change order number. A role missing from the rate schedule cannot be billed.
3. Unit prices from the schedule of values
Apply the contract's pre-agreed unit prices to the added quantities. Fastest of the three and hard to argue with. The catch: unit prices negotiated for base bid quantities assume production rates the changed work may not match. Before accepting unit-price treatment, ask whether the changed conditions match the conditions the unit price was built on.
A change order is not a bid, and it should not be priced like one. If the distinction between takeoff, estimate, and bid still feels blurry on your team, our breakdown of takeoff vs estimate vs bid is worth ten minutes before your next pricing meeting.
Build a T&M Rate That Covers Your Real Cost
Most T&M disputes are not about hours. They are about rates that never covered the true cost of the hour. A billable labor rate has four layers:
Loaded rate = base wage + labor burden + overhead allocation + profit
Here is the buildup for a journeyman in an open-shop market, worked as an illustrative example:
| Rate component | Calculation | Amount |
|---|---|---|
| Base wage | Straight-time hourly wage | $32.00 |
| Labor burden (30%) | Payroll taxes, workers comp, benefits | $9.60 |
| Overhead allocation | Office, insurance, vehicles, supervision per field hour | $12.00 |
| Subtotal before profit | $32.00 + $9.60 + $12.00 | $53.60 |
| Profit (15% on subtotal) | $53.60 x 0.15 | $8.04 |
| Loaded billing rate | Rounded for the rate schedule | $62.00/hr |
Run this buildup for every classification on your payroll, because a single blended rate either overcharges the laborer or undercharges the foreman. Published 2026 T&M rate guides put typical billed rates in these bands, which you can sanity-check your own buildups against. Union jurisdictions run higher base wages, so rebuild from your actual wage scale rather than borrowing an open-shop number.
| Labor classification | Typical billed T&M range (2026) |
|---|---|
| General laborer | $45 to $55 per hour |
| Carpenter / mechanic | $65 to $80 per hour |
| Journeyman electrician | $85 to $100 per hour |
| Foreman / project supervisor | $80 to $95 per hour |
Revisit the overhead allocation every year: a rate built on last year's office costs is already under-recovering. Material markup on T&M work typically runs 15% to 35% depending on handling complexity, and your contract should define exactly what counts as material cost (purchase price, tax, freight) before the first invoice.
Markup vs Margin: The Points Subs Leave on the Table
Here is the most expensive arithmetic error in subcontracting. Markup is profit divided by cost. Margin is profit divided by price. They are not interchangeable, and treating them as the same quietly donates margin on every change order you price.
You want a 30% margin on a change. You mark up costs by 30%. You did not get 30%. On $1,000 of cost, a 30% markup gives a $1,300 price and $300 of profit: a 23% margin, not 30%. That 7-point gap repeats on every change, all year. The conversion is standard math: markup = margin / (1 - margin). Tape this table inside your estimating folder:
| Target margin | Required markup | What "markup as margin" actually gives you |
|---|---|---|
| 10% | 11.1% | 9.1% |
| 15% | 17.6% | 13.0% |
| 20% | 25.0% | 16.7% |
| 25% | 33.3% | 20.0% |
| 30% | 42.9% | 23.1% |
| 35% | 53.8% | 25.9% |
Now apply it. Direct costs for the added scope come to $3,200. Your overhead allocation is 30% ($960), bringing true cost to $4,160. For a 20% margin: $4,160 / (1 - 0.20) = $5,200. Check it: $1,040 of profit on $5,200 is exactly 20%.
The contractor who prices the same change at $3,200 plus a hopeful 15% lands at $3,680 and recovers zero overhead. Your overhead does not pause because the client added work.
Price the Disruption, Not Just the Direct Work
The direct work is the easy part to price. The disruption is where change orders actually lose money, because it never appears on a drawing. Build these line items into your change order template so they get priced every time:
- Mobilization and demobilization. A two-day added scope still needs a truck roll, tools, and setup.
- Supervision and coordination. Your foreman's hours managing the change and sequencing around other trades.
- Overtime premiums. If the change has to happen on nights or weekends to hold the schedule, the 1.5x premium is a direct cost of the change.
- Lost productivity from stacking. Crews working around other trades produce fewer units per hour. Price the productivity factor you actually experience.
- Rework of completed work. Opening finished walls, re-routing installed systems, re-testing. Demolition of your own installed work is still demolition.
- Extended general conditions. When a change extends your duration, supervision and insurance stretch with it. Price the days.
- Change order preparation itself. If pricing the change took your estimator half a day, that time is a line item at your standard hourly rate.
None of these are padding. The estimator who itemizes disruption gets argued with once and paid. The estimator who hides it in a lump sum gets argued with every month.
The Paperwork That Gets You Paid
Pricing a change order correctly means nothing if it never gets approved. The number one reason change orders get rejected or reduced is thin documentation. Make this checklist your field procedure for every change:
- Written notice before the work, not after. Email the GC the moment you identify work outside your scope. Most contracts require notice within 7 to 14 days of discovery. Miss the window and you can lose the claim entirely.
- Photos: before, during, and after. Photos are the most persuasive evidence in any change order dispute. A foreman's phone is the cheapest insurance on the job.
- Itemized cost breakdown, never a bare lump sum. Labor hours by classification, material quantities with unit costs, equipment, sub-tier costs, and markup on separate lines. GCs assume an unexplained lump sum is padded; an itemized one gets reviewed on its merits.
- Cite the contract. Reference the scope section, drawing sheet, or specification that proves the work is outside your original scope. "This wall was not shown on sheet A-3" beats "this is extra work" every time.
- Daily reports tied to the change order number. If the change spans multiple days, your foreman logs the hours against the CO number daily. On T&M changes this log is the invoice backup.
- Signed authorization before mobilizing. No signature, no work. The one exception is a written construction change directive, which authorizes urgent work while price is still negotiated. A verbal "go ahead" is not a directive; confirm it in writing the same day.
Deductive Change Orders Need the Same Rigor
Not every change adds scope. Deductive change orders remove work and reduce the contract price, and subs handle them badly in the opposite direction: they give away too much credit.
Clients consistently expect larger credits than the work is worth. They see the deleted line item and expect its full bid value back, forgetting that mobilization already happened and materials may already be purchased. Price a deductive change exactly like an additive one: true cost of the deleted work, minus costs already incurred, with your markup applied on the same basis.
Document deductive changes in writing with the same formality; a handshake credit discussed in a job trailer has a way of growing 20% by the time it reaches the pay application.
When the GC Pushes Back on Your Number
Pushback is normal. Panic-discounting is not a strategy. When a GC challenges your change order price, work this sequence:
- Lead with the backup, not the bottom line. Walk them through the itemized breakdown. Most objections evaporate when the GC sees labor hours, material receipts, and the contract clause side by side.
- Separate the negotiable from the non-negotiable. Hours and quantities are facts. Markup percentages are contract terms. Schedule impact is physics.
- Show the schedule impact in days, not adjectives. "This adds three days to our sequence" is a negotiating position. "This is disruptive" is a complaint.
- Know your walk-away. A change order priced below true cost is a liability with a signature on it.
Methodology: Where These Numbers Come From
Every figure in this guide comes from observable market sources, not guesswork. Here is the basis so you can judge the numbers the way an estimator would.
| Assumption | What this guide uses |
|---|---|
| Pricing source | Published 2026 industry guidance (contractor overhead and markup guides citing CFMA Benchmarker data and the NAHB Cost of Construction Survey, plus 2026 change order and T&M contract guides). Reviewed October 2026. |
| Labor assumptions | Loaded rates use a 25% to 35% labor burden, a per-hour overhead allocation, and 10% to 15% profit. Billed rate bands are 2026 national US averages. |
| Location adjustment | National averages. Expect 15% to 30% above these bands in high-cost metros (New York City, San Francisco, Los Angeles, Boston) and 10% to 20% below in rural markets. |
| Project size | Typical commercial subcontracts from roughly $100,000 to $5 million. Very small changes carry higher relative overhead. |
| Union vs non-union | Wage bases assume open-shop rates. Union jurisdictions carry higher base wages; rebuild the loaded rate from your actual wage scale rather than adjusting these bands. |
| Overhead in the examples | Worked examples use a 30% overhead allocation, taken from your own profit and loss statement and recalculated annually. Date reviewed: October 2026. |
Treat every number here as a planning range and a pricing method, not a quote. Your final change order price has to be built from your own burden rates, your own overhead, and the markup terms in your signed subcontract. If you want a second set of eyes on the math before a change goes out, our construction estimating services include change order pricing review alongside full bid estimating. See how our pricing works for turnaround and fee structure.
Frequently Asked Questions
What markup can a subcontractor charge on a change order?
Whatever your subcontract allows. Typical caps run 15% to 20% on your own labor, 10% to 15% on materials and equipment, and 5% to 10% on sub-tier pass-through, with institutional work often capped at 10% combined. Always apply your real overhead and profit; a cap is a contract term, not a suggestion to work at cost.
Should I start the work before the change order is signed?
No. Doing the work first turns your price into a negotiation you have already lost. The only exception is a written construction change directive for urgent work. A verbal go-ahead is not a directive; confirm it in writing the same day.
How do I bill labor on a T&M change order?
At the loaded rates in your signed rate schedule, by classification, with hours logged daily against the change order number. Every role that touches the change must appear in the rate schedule or you cannot bill for it.
My subcontract caps change order markup at 10%. What can I do?
For this project, negotiate what the cap applies to: the definition of direct cost and whether disruption items sit inside or outside it. Tighten your scope definitions to minimize change exposure. And negotiate the cap before you sign the next subcontract, when you still have leverage.
Send Your Plans for a Project-Specific Construction Estimate
Every change order you price this month is either protecting your margin or quietly giving it away, and the difference is rarely the direct work. It is the overhead allocation, the margin math, the disruption line items, and the paperwork that turns a price into a payment.
Build your loaded rates once, template your change order breakdown, read the markup clause before you need it, and document every change like it will be audited. Send your plans for a project-specific construction estimate, including change order pricing support, and bid your next job knowing exactly what stands behind every number.
