What Is a Contractor Change Order?
A change order is a written update to your original contractor agreement, signed by you and the contractor, that changes the scope, price, or timeline of the work. You need one anytime something shifts from what the contract describes — a different material, a bigger repair once a wall is opened, an added room, or a new completion date.
If it isn’t in writing and signed by both sides, it isn’t a change order — it’s just a conversation, and conversations are hard to prove later if a disagreement comes up.
By HomeRemodelingAndRepairs.net Home Research & Editorial Team
The core idea comes directly from how the Federal Trade Commission’s home improvement guidance describes a sound contract in the first place: it should spell out the scope of work, the materials, the price, and the start and completion dates. See how this site verifies and sources its guidance for more on why we build articles around named, checkable sources like this one. A change order applies that same discipline to anything that shifts after work begins.
Terms to Know Before You Sign Anything
- Scope of work: The specific tasks and materials listed in the original contract — what the contractor agreed to do, in detail.
- Change order: A signed, written document that modifies the scope, price, or timeline of the original contract.
- Allowance: A budgeted amount in the original contract for an item you haven’t picked yet, like flooring or fixtures. Going over the allowance usually triggers a change order.
- Concealed condition: A problem discovered only after work starts, such as water damage or outdated wiring behind a wall. Contracts often treat these differently from a homeowner-requested change.
- Approval trail: The chain of dated, signed documents — original contract plus every change order — that shows what was agreed to and when.
What’s the Difference Between a Homeowner Change and a Concealed-Condition Change?
Not every change order happens for the same reason, and the reason affects how you should evaluate the cost.
- Homeowner-requested change: You decide you want something different than what was originally specified — a larger window, upgraded countertops, an added outlet. You’re generally driving the cost increase, so ask for a clear breakdown of the added labor and materials before agreeing.
- Concealed-condition change: The contractor finds something once work is underway that wasn’t visible during the estimate — deteriorated framing, old plumbing that doesn’t meet current code, or similar issues. It’s worth discussing this possibility before the project starts, so you both know how it will be documented and priced if it happens.
- Scope clarification: Sometimes what looks like a change order is really a disagreement about what the original contract already covered. This is exactly why a detailed original scope of work matters — it’s the reference point both sides go back to.
Some concealed conditions — old wiring, suspected asbestos, structural framing issues — cross into work that shouldn’t be handled as a routine change order at all. Check the site’s project safety stop points if a “discovery” during your project involves electrical, gas, structural, or hazardous-material conditions; those call for a licensed professional, not just a price adjustment.
Quick Decision Path
- If you want something different than the original spec, then ask for a written change order with the added cost and labor broken out before you approve it.
- If your contractor finds a hidden problem once work has started, then ask how that scenario is handled under your existing contract before agreeing to a price on the spot.
- If you and the contractor disagree about whether something was already covered in the original scope, then go back to the signed contract’s scope-of-work language first — that document, not memory, settles it.
- If a contractor wants to proceed on a verbal understanding, then pause the added work until it’s written and signed by both of you.
How Do You Handle a Change Order, Step by Step?
- Stop and ask for it in writing. Before agreeing to any change verbally, ask the contractor to put it in writing. Reluctance to document a change is a signal to slow down.
- Compare the change order against the original contract. Does the new document reference the specific line item it’s modifying? Does it leave the rest of the original scope untouched, or does it quietly alter other terms too?
- Confirm the change order includes four things. A usable change order should state: what specifically is changing, the material or labor involved, the added or reduced cost, and the effect on the completion date.
- Ask how the price was calculated. You’re entitled to understand whether you’re being charged by materials cost, a labor rate, or a flat fee for the added work.
- Check the payment timing. The FTC’s guidance on home improvement contracts cautions against paying the full amount for a portion of work before it’s done, and against paying the entire project cost upfront. Apply the same caution to change orders — avoid paying in full for added work before it’s completed.
- Sign and date it — both parties. A change order isn’t binding until it’s signed by you and the contractor, with a date.
- Keep a copy in your project file. Store it with your original contract, not as a separate loose paper.
- Revisit your total project cost after each change order. Small changes add up — update your running total so you know your actual project cost, not just the original bid.
What If a Contractor Won’t Put a Change in Writing?
A contractor who wants to proceed on a verbal understanding, pushes for an immediate decision, or discourages you from keeping paperwork is showing exactly the pattern the FTC flags as a home improvement warning sign. That doesn’t mean every reluctant contractor is acting in bad faith, but the paperwork gap is your leverage point. Pause the added work until the change order is written and signed.
If a dispute over a change order can’t be resolved directly with the contractor, your state or local consumer protection office is a resource for questions about contractor requirements and complaint history. Find your state consumer protection contact through USA.gov.
What Should Your Change Order Paper Trail Include?
By the end of a project with any changes at all, your approval trail should include the original signed contract, every change order in the order they occurred, any written correspondence discussing a change before it was formalized, and a running total of project cost reflecting the original price plus every signed change order. This isn’t paperwork for its own sake — it’s the record that protects both you and the contractor if a question comes up later about what was agreed to.
Frequently Asked Questions
Can a contractor just verbally tell me about a price change?
A verbal update isn’t a change order. Ask for the change in writing, with the added cost, materials, and any effect on the timeline spelled out, before you agree to pay for it.
Do I have to sign every change order a contractor gives me?
No. A change order is a proposal until you sign it. If you disagree with the price or scope, you can negotiate it or decline, though declining may affect the project timeline depending on your original contract’s terms.
What if the change order doesn’t match what we discussed?
Don’t sign it. Go back to your contractor, point to the discrepancy, and ask for a corrected version before any additional work begins.
Does a small change still need a formal change order?
Any change to price, materials, or timeline is worth documenting in writing, even a small one. Small undocumented changes are exactly what makes a final bill hard to reconcile against the original contract.
Educational Disclaimer
This article provides general educational information about documenting contractor changes and is not legal advice. Contract law, consumer protection requirements, and licensing rules vary by state and locality. For questions about a specific contract dispute, consult your state or local consumer protection office or a qualified attorney, or review the site’s editorial standards for how this guidance is built and reviewed. This site is an independent educational publication and is not affiliated with any contractor, contracting company, or licensing body.
Page last updated: September 2026.