Updated October 2026
A home builder gets paid for a change order when four things are settled before anyone picks up a tool: the price, the client's signature, the sub's matching change, and the draw or deposit that bills it. Each of those four is a place a change order can slip through unbilled, whatever form you use.
The money at stake is a bigger share of profit than it looks. Single-family builders averaged an 8.7% net profit margin in 2023, according to NAHB's Cost of Doing Business study, and remodelers averaged 6.3% in 2024, NAHB's remodeler study found. On a $900,000 custom home at 8.7%, the builder clears about $78,300. Three $4,000 changes that never get billed take more than 15% of that.
This guide is the client side of the problem, written for custom builders and remodelers: what goes in the contract, how to price and sign a change, how to keep your subs' changes matched to your client's, and how to bill it. Our guide to where change order margin disappears covers the field side, the small verbal yeses nobody writes down.
- Write down the requestThe day it's asked, with photos and the client's own words.
- Price itSub's quote plus your markup, the days it adds, and a date the price expires.
- Client signsBefore the work starts. Small changes too.
- Release the sub's changeSame scope, same number, so the two match.
- Bill itA deposit now for special-order materials, the rest as its own line on the next draw.
- Mark it paidThe log closes when the money lands.
What should your contract say about change orders?
Your contract should say that no added work starts without a signed change order, how changes are priced, when they're paid, and that a change can move the finish date. Write it before the first change comes up. A client who signed that process at the start is far easier to hold to it in month five.
State law may already set the minimum. California's home improvement law, which covers remodels, additions and rebuilds after a declared disaster but not an ordinary new home, says a change order isn't enforceable against the buyer (the owner or tenant who hired you) unless it states the scope of the work, the amount added to or subtracted from the contract, and its effect on progress payments or the completion date. The same section leaves a builder who skipped the paperwork a fallback: a legal or equitable claim to prevent unjust enrichment, which means pursuing a claim instead of sending a bill. Rules differ by state, so check yours before you copy someone else's form.
The change order clause itself can be short. Make sure it covers:
- No added work without a signed change order, and what counts as an emergency exception.
- Your pricing method for changes, either cost plus a stated markup or a fixed quote.
- When change orders get paid (more on that below).
- Schedule: every change order states the days it adds, and the finish date moves with it.
- How long a quoted price stays good.
How do change orders work when a bank is funding the job?
When a lender is funding the job, a change may need the lender's sign-off as well as the client's, and any increase the loan wasn't sized for has to be paid from outside it. Construction lenders set their own rules, so ask the client's loan officer at kickoff how a change gets approved and who funds the difference, before the first one comes up.
On a Fannie Mae HomeStyle renovation loan, the Servicing Guide has the servicer require a change order request from the borrower, with a description, the cost and the estimated completion date, before it approves any change to the plans. Further money comes out of the renovation escrow only after an inspection confirms the work matches the plans, approved changes included.
Money is the other half. On a HomeStyle loan, the Servicing Guide says the borrower or the servicer must fund any increase in costs during the renovation. Settle who covers an increase before the client signs the change.
How do you price a change order so it doesn't lose money?
Price a change order at its full cost plus the same overhead and profit you built into the contract, and put an expiry date on the number. A change passed through at the sub's cost earns nothing, and somebody in your office still has to manage it and bill it.
The overhead is real money. NAHB's study put single-family builders' gross margin at 20.7% in 2023, with operating expenses (finance, sales, general and administrative costs and the owner's pay) taking 12.0% of revenue. For remodelers in 2024, overhead took a bigger share: a 29.9% gross margin, with operating expenses (which for remodelers include indirect construction costs) at 23.6% of revenue, per NAHB. A remodeler who bills a $10,000 change at cost has paid for about $2,360 of office and overhead out of the job's profit, if the change uses the office the way the rest of the work does.
Full cost means more than the sub's number. Count restocking fees on anything you already ordered, a second delivery, permit or engineering revisions, and the days the change adds to your own supervision. Then give the price a short life, because the sub's quote and the supplier pricing under it have one too, and material prices are still moving. The median builder in NAHB's July 2026 survey said the materials for the same house cost 6.7% more than a year earlier. We'd write "price good for 14 days" on every change order and re-price anything signed after that.
When should the client sign the change order?
Before the work starts, every time, including the $300 ones. The small changes are the ones that pile up, because each one feels too minor to stop for. The signed version should carry what California's law asks for, which is a sound minimum anywhere: the scope, the dollar change and the schedule change.
Greg Woleck, a production consultant for Remodelers Advantage and a former project manager and lead carpenter, put the field side of this plainly in a JLC article in August 2026: "Scope creep is as much a company culture problem as a process problem. Your team has to be trained to say, 'let me price that' instead of 'sure, no problem.'"
That sentence works best when the client already heard it at the kickoff meeting. Tell them how changes work before the first one, and the request on a Friday afternoon becomes a routine step.
Hidden conditions are the hard case, because the job stops until someone decides. When the crew finds rot behind a wall or rock in a footing, photograph it, text the client what you found and a not-to-exceed number, and get their written yes before the affected work goes on. Then send the formal change order within a day. A text with a number and a yes is evidence. The signed change order is what you bill from.
Signing doesn't have to wait for a meeting, since a client can e-sign on a phone. AIA's standard G701 change order is built around the same agreement: the change in the contract sum and the change in contract time, with signature lines for the owner, the contractor and the architect.
How do you match a sub's change order to the client's?
Treat every change as two change orders. One raises what you owe the sub. The other raises what the client owes you. Approve the sub's only after the client's is signed, unless you've decided the cost is yours to absorb.
Most of a builder's revenue goes back out as cost of sales, which is why the pairing matters. Cost of sales (land plus direct and indirect construction costs) took 79.3% of single-family builders' revenue in 2023, per NAHB. Remodelers paid trade contractors 30% of their revenue in 2024, down from 36% in 2021, according to NAHB's remodeler study. Every subcontract inside those numbers can change after the contract is signed.
Say the client asks for a herringbone pattern in the primary bath instead of straight-lay tile. The tile sub says it's another $2,800 in labor, your super says fine, and the sub's change gets signed in the field. The client's change order never gets written, because everyone was standing in the bathroom and it felt agreed. At the next draw you owe the sub $2,800 and have nothing to bill. The first sign may be the tile sub's bill, $2,800 over the tile line.
Number the pair the same way (CO-12 for the client, SCO-12 for the sub) so a missing half is visible in the log. When a change really is yours to eat, because your plans missed something or your crew made a mistake, write the sub's change order anyway and leave the client's at zero. Then the budget shows where the money went, and it doesn't turn up as a surprise variance three months later.
Should change order money come up front or on the next draw?
Take a deposit up front for anything with special-order or non-returnable materials, and bill the rest as its own line on the next draw. The one thing to avoid is holding change orders for the final bill, when the client has already paid for everything else and the loan is nearly spent.
The interest on a carried change is small. NAHB's AD&C financing survey of builders put the average contract rate on pre-sold single-family construction loans at 7.01% in the second quarter of 2026, and the average effective rate, with points, at 11.67%. Fronting a $15,000 change for 60 days costs about $173 at the contract rate and about $288 at the effective rate. The real exposure is a client who disputes the change at closeout, when you have no payment left to hold.
How do you keep approved change orders from piling up until closeout?
Keep one change order log per job, give every change order a status, and review the log before every draw. A signed change order that never got billed is the one that turns into an argument at the end of the job.
| Status | What it means | What moves it to the next one |
|---|---|---|
| Requested | The client or a sub asked; nothing is priced | A price, a schedule impact and an expiry date |
| Priced | You know the number | Sending it to the client |
| Sent | The client has it | Their signature, or a decline with a reason |
| Signed | Work can start; the sub's matching change can go out | Billing a deposit, or the next draw |
| Billed | It's on a draw or an invoice | The money arriving |
| Paid | Closed | Nothing. Done. |
Before every draw, run the log against these checks:
- Signed change orders that aren't billed yet.
- Any sub change order with no matching client change, which is money you owe and can't bill.
- Sub bills that run a budget line over. Before you approve one, decide whether the overrun is a change the client owes you or a cost you're keeping.
- Billed change orders still unpaid from the last draw.
- Requests sitting unpriced for more than a week, because the client is still waiting on a number and the work may already be underway.
Bill each signed change order as its own line on the draw, so the client and the bank see it beside the work it pays for. Our draw schedule guide covers how the draws themselves are sized, and what goes in a draw package covers the paperwork a lender asks for.
Allowances deserve their own line in the log. On a custom home, a finish that runs over its allowance is a change order like any other, and it's easy to forget because the client "already picked it." Write the overage up as a change order the day the selection is made.
What should change order software do for a home builder?
Change order software earns its keep when the client's signature, the sub's cost, the budget and the draw all live in one place, so a signed change can't miss the next bill. A builder with two or three jobs going can run all of this from a spreadsheet log and an e-signature app. Past that, the handoffs between those two tools are where changes get lost.
In a demo, ask the vendor to show you:
- A client selection that runs over its allowance, turning into a change order.
- The client approving it from a phone with no account to set up.
- Whether the budget shows a sub's approved change as an overrun until the client's matching change is signed.
- The next draw, with that change order on its own line and nobody retyping it.
Our comparison of software for custom home builders describes that test and what each tool's own site says about it, with published prices for ten users.
Where Trade Agent fits
Trade Agent is an operating system for residential builders, and it's one option for a builder who wants the change order, the budget and the draw in the same system. Each change order is one record with a number, where it came from and the client's decision.
You send the change order and the client approves it from an emailed link, no account needed, and the decision stays on the change order's record. Once it's approved, it writes the amount onto the budget lines it touches. A sub's change order raises what you owe that sub but leaves the budget alone, so until the client's matching change is approved, the gap reads as an overrun on the job. On a fixed-price job with a signed prime contract, a draw billed from the contract's lines shows each approved change order as its own line on the schedule of values. The builders page walks one allowance from the estimate to the draw.
Trade Agent doesn't take the client's draw payment online. The money arrives the way it does now, and you record it on the draw when it lands. Our price isn't listed, so ask us for a quote. If you want to see your own messiest change order run through it, book a demo and bring that one.
