Most advice on how to price a change order is about the number: labor rates, markup and a line for overhead. That part is rarely what gets argued. Clients push back on whether they should be paying at all — whether the work was already in the contract. A change order price holds when the document shows three things in order: the original scope it sits outside of, a cost built from the same rates as the original estimate and the time it adds. Get the first one right and the other two are rarely contested.
The rate is rarely the argument
When a homeowner disputes a change order for moving a bathroom wall, the objection is almost never that the carpenter's rate is too high. It is “I thought that was included.” Or “nobody told me it would cost extra.” Or “the plans showed it there all along.”
Each of those is a claim about scope or about notice. None of them can be answered with a better rate sheet. They are answered with the contract, the estimate, the drawings and a dated record of who asked for what. If those documents are thin, a perfectly priced change order still turns into a negotiation — and the builder usually gives ground because the record does not support holding it.
Establish that the work is outside scope before pricing it
Before anyone opens a rate library, the change order needs a sentence that says what the contract covered and how this work differs. That sentence needs a source. In order of strength:
- The signed contract and its exclusions list. An explicit exclusion — “tile above 48 inches not included” — ends most scope arguments in one line.
- The estimate line items the contract was priced from. If the estimate carried 320 square feet of LVP and the client now wants 410, the difference is arithmetic, not opinion.
- The drawing set and revision the contract references. Name the sheet and revision: “A-201 rev 2 shows a 36-inch door; owner requests 42-inch.”
- Specifications and allowance schedules. Allowances are where many residential scope fights live — a $3,500 fixture allowance against a $5,200 selection is a change order with the math already done.
- RFI responses and written direction. A dated email or portal message from the owner or architect asking for the change.
- Site conditions documented when found — a daily log entry and photos with a job, a date and a reason taken the day the rot, ledge rock or undersized beam was uncovered.
The further down this list the evidence sits, the more the change depends on memory and goodwill. Exclusions and line items are hard to argue with. A verbal request in the driveway is easy to argue with.
The most expensive change order is the one built after the work is done. Once the wall is framed, the client is negotiating against a sunk cost and the builder has lost the option to not do the work. Get written direction — even a one-line approval of a not-to-exceed figure — before the crew starts. If the full price is not ready, issue a pending change with a ceiling and a date by which the final number will follow.
Build the cost from the same numbers as the estimate
Once scope is settled, the price itself should be boring. The way to make it boring is to price the change from the same rate library the original estimate used. If the bid carried drywall hang-and-finish at one rate per square foot, the change order uses that rate. A client who accepted the rate in March has little ground to question it in July. A new rate invented for the change invites exactly the argument the builder was trying to avoid.
A change order price breaks into the same components as the estimate:
- Direct labor — hours by trade at the rates in the estimate, including burden if the estimate included it.
- Materials — quantities from a takeoff, not a guess, with waste factored the same way the original was.
- Equipment — rental days or owned-equipment rates for anything the change adds.
- Subcontractor costs — the sub's written quote attached, not paraphrased.
- Time-related general conditions — supervision, dumpster, temporary power and insurance for every day the change extends the job.
- Overhead and profit — at the percentage the contract specifies. Many contracts set one. If yours does, use it and cite the clause.
Showing the breakdown matters more than the total. A lump sum invites the client to guess what is inside it and argue with the guess. A breakdown that matches the original estimate's structure lets them check it against something they already signed.
Credits work the same way. When the owner deletes scope, the credit comes off at the same rates — and reflects what has already been bought. A deleted window that is already sitting on site is not a full credit, and the change order should say so with the restocking fee or the sunk cost shown.
Price the time, not only the work
The cost most often left off a change order is time. A two-day change on an activity with float costs little beyond the work itself. A two-day change on the critical path moves the finish date and every daily cost that runs until then. The critical path activities on the job decide whether an added scope item is a cost line or a schedule event.
State the schedule impact on the change order in days, and state that approving the change order approves the new completion date. Unpriced time is where later disputes come from: the client approves the cost, the job finishes late and nothing in the record says the delay was agreed. Delay disputes turn on what was written down when the change happened, which is why the record decides who pays for a delay.
What the document itself needs to carry
A change order that holds up has the same parts every time. A written change order process makes this a habit rather than something rebuilt on each job. At minimum:
- Number and date — sequential per job, so a missing one is obvious.
- Scope reference — contract section, estimate line, drawing sheet and revision or the RFI it answers.
- Direction — who asked for it, when and how: email, portal message or site meeting minutes.
- Description — what is being added, deleted or changed, in quantities.
- Cost breakdown — by the components above, with sub quotes attached.
- Schedule impact — days added, or “no change to completion date.”
- Approval deadline and signatures — the price is valid until a stated date, after which it is repriced.
Where pricing goes wrong anyway
- Absorbing small changes — three $400 favors become a $1,200 hole, and the client learns that changes are free. Write them up even at zero cost, with the value shown and waived.
- Pricing the change in isolation — moving an outlet is cheap, but moving it after drywall means patch, tape and paint plus the painter's return trip. Price the knock-on trades.
- Bundling — one change order covering five unrelated items gets held up by the one item the client disputes. Separate them.
- Verbal approvals — they get signed later, if at all, and the signature arrives after the leverage has gone.
- Leaving approved changes out of the budget — a job carrying approved changes against an unchanged budget shows margin that is not there.
How BuilderSolve handles change orders
In the BuilderSolve platform, change orders are priced from the estimate's rate library and carry an audit trail — who drafted it, who changed the numbers and when the client approved it in the branded portal. Approved changes feed budget vs. actual and can shift the schedule built from the estimate. The AI assistant can draft a change order from a daily log or a client message. A person reviews it and approves or rejects it before it goes anywhere. It does not send pricing to a client on its own.
Two things it does not do. It reads QuickBooks one way and does not write to it — billing for an approved change still happens in QuickBooks, which stays the book of record. And purchase orders are in development, not shipped, so committing material for a change still happens outside the platform for now. For builders who would rather not price changes themselves, the services side includes estimating and finance staff who build change order pricing against the same rate library and track it through to the books.
What to do next
Pull the last three change orders that got argued about. For each one, find the line in the contract, estimate or drawings that showed the work was not included. If that line existed and was not on the change order, the fix is a template with a required scope reference field. If it did not exist, the fix is upstream — tighter exclusions and line-item estimates on the next contract. That is most of how to price a change order so it holds: lead with scope, attach the evidence and let the price be the easy part.
Common questions
how do you price a change order in construction
Price it from the same rate library the original estimate used, then add time-related costs and the overhead and profit percentage the contract sets. Show the breakdown by labor, materials, equipment, subs and general conditions rather than a lump sum. Before any of that, cite the contract, estimate line or drawing showing the work was outside the original scope — that is what clients actually dispute.
what markup should I put on a change order
Use the overhead and profit percentage the contract specifies, if it specifies one — many do, and citing the clause ends the discussion. If the contract is silent, use the same markup the original estimate carried so the change matches what the client already accepted. A higher markup for changes needs to be agreed in the contract, not introduced on the first change order.
should a change order include schedule delays
Yes. Every change order should state its schedule impact in days, or state that the completion date does not change. If the change hits a critical path activity, price the daily general conditions for the added time as well. Writing the new date onto the signed change order means approving the change also approves the delay, which closes off a later dispute over who caused it.
what to do if client refuses to sign change order
Check the scope evidence before arguing price. If the contract, estimate or drawings show the work was excluded, put that reference in writing and follow the contract's dispute or directive process. If the evidence is thin, the disagreement is real and becomes a negotiation. Doing disputed work without a signature or written directive gives away most of the builder's bargaining position.
can I charge for a change order after the work is done
Sometimes, but it is the weakest position to price from. Many contracts require written authorization before changed work begins, and a client asked to pay for finished work is negotiating against a sunk cost. If urgent work had to proceed, document the direction the same day — a message, a log entry and photos — and issue the priced change order as soon as possible.