A change order is a formal, written modification to an existing construction contract that changes the scope, price, completion date, or a combination of these, and it is valid only once both parties authorize it.
Your roofing crew has removed the shingles and found damaged decking. Or your window installation is approaching, and you've decided you want a different product. Before you agree to anything, you need to know whether the change is necessary, what you'll pay, and when the job will now finish. Those are decisions about your money and calendar, not just paperwork.
What a Change Order Is in Plain Terms
A change order updates a specific part of your agreement without replacing the entire contract. The original agreement still governs the project, except where the approved modification says otherwise.
Think of it as a revised recipe card that both cooks initial before the new ingredient goes in. You're still preparing the same dish, but nobody has to guess which ingredient changed or who agreed to it.
The Federal Highway Administration's change-order guidance describes a change as an alteration to the original contract that can affect cost, schedule, design details, specifications, or a combination of those factors.
What counts as a change
Exterior remodeling examples include:
- Added work: Repairing roof decking after tear-off exposes deterioration.
- A product upgrade: Switching from standard windows to upgraded units.
- Deleted work: Removing part of a planned siding package.
- A time adjustment: Extending completion because an unforeseen condition interrupts the planned sequence.
A change doesn't have to increase the bill. It might produce a credit, exchange one material for another, or adjust the completion date without changing the price. The document should say which outcome applies rather than leave you to infer it.
Different names, the same practical question
Public agencies use related terms such as contract modification, supplemental agreement, work order, and time extension. For homeowners comparing document labels, LiveDocument's explanation of when to use an addendum offers useful context. The label alone doesn't tell you whether the revised agreement is complete.
What matters is whether the document connects the requested alteration to its financial and scheduling consequences. A conversation about repairing decking isn't a complete agreement if nobody has settled the quantity, price basis, or completion impact.
Practical rule: If a proposed change alters the work, price, or time, put the adjustment in writing before the affected work begins.
Anatomy of a Compliant Change Order
Use this checklist to turn a field request into a clear adjustment to the original contract; the quantities and durations in the examples are hypothetical, not standard allowances.
Required elements of a change order
| Element | What It Records | Example From a Roof or Window Job |
|---|---|---|
| Originating provision | The contract clause that allows the change | Clause covering concealed decking damage |
| Revised scope | Drawings, specifications, or a written description of changed work | Replace four rotted sheets of roof decking |
| Quantities and unit prices | Affected amounts and the cost basis for each | Four sheets priced at the agreed unit rate |
| Net price adjustment | Increase, decrease, or substitution shown as one figure | Added amount listed separately from the base contract |
| Schedule effect | Additional or reduced days and the activity affected | Two extra days for inspection and re-sheathing |
| Warranty and materials | Whether warranties change and who supplies materials | Confirm whether the proposed product satisfies manufacturer warranty requirements |
| Authorization | Required signatures and dates before changed work starts | Homeowner and contractor sign before materials are ordered |
Identify exactly what you're approving
An additive change adds work. A deductive change removes work and records the applicable credit. A substitution replaces something already specified, such as exchanging standard windows for triple-pane units.
Substitutions need particular care. The price adjustment should account for the original product being removed, not just list the full cost of its replacement. Likewise, deleting a siding section should identify both the omitted installation and any materials already purchased that affect the credit.
Keep the original signed scope intact and document each departure separately. AurenWell's guide to how to amend a client contract provides additional context for connecting a modification to the agreement it changes.
Separate residential approval from federal procedures
The Federal Acquisition Regulation's contract-modification provisions permit certain unilateral changes under an authorized changes clause, with price or time adjustments documented afterward through a supplemental agreement. That's an important exception to the everyday homeowner model of a mutually signed amendment, not permission to assume the same procedure applies to your remodel.
For concealed damage, attach evidence that supports the proposed quantity. Photographs should identify the affected location, and the measured count should match the estimate. If more damage could emerge, specify how additional quantities will be verified and authorized.
Verbal approvals, isolated texts, and informal allowances are weak controls. They may show that a conversation happened without establishing the complete scope or agreed valuation. Keep the signed amendment, supporting photographs, revised specifications, and pricing together.
Common Causes and Their Cost and Schedule Effects
Every change order is really two decisions at once: what happens to the money, and what happens to the calendar. Industry data suggests both move more often than homeowners expect. In a 2025 survey of global architecture, engineering, construction and operations professionals, 92% reported significant budget changes during construction, while 56% identified change orders, client changes and scope creep as the primary causes of costly rework, according to PBC Today's coverage. Those findings describe the surveyed professionals, not the likelihood that your particular remodel will exceed its budget.
The useful question is which event changed the plan, whether it is required or optional, and what work follows from it.
Common change order causes and their typical impact
| Cause | Typical Example | Cost Effect | Schedule Effect |
|---|---|---|---|
| Unforeseen site condition | Hidden rot found after tear-off | Added removal, disposal, and replacement work | Verification and repair before covering the roof |
| Owner-requested upgrade | Switching to triple-pane windows | Product-price difference plus associated installation changes | Special-order lead time |
| Design or measurement error | Flashing detail or dimensions don't match the opening | Correction, replacement, or rework costs | Re-measuring and material reordering |
| Code or safety requirement | Added underlayment or ventilation | Necessary compliance work, with payment responsibility established separately | Possible inspection hold |
| Material unavailability | Discontinued siding color | Substitute price and any return or freight charges | Approval and delivery waiting time |
| Subcontractor-generated change | Trade partner requests added scope | Added trade labor, materials, and coordination | Rescheduling across crews |
| Owner decision delay | Homeowner hasn't selected a finish | Potential overhead and remobilization costs | Idle time and shifted completion |
Required first, optional second
Rows in that table fall into two groups. Unforeseen conditions, code or safety requirements, and correction of errors are required work: the project cannot proceed lawfully or safely without them. Owner-requested upgrades, substitutions for unavailable materials, and anything driven by a preference are optional, which means you can weigh the price against the benefit before you sign. Sorting a request into the right group tells you whether you are deciding if the change happens at all, or only how to pay for a change that must happen anyway.
Why the price can exceed the material difference
Say you select a different window after the original units have been ordered. The contractor may need to revise measurements, arrange returns, change flashing details, and book another delivery. A product-price comparison alone won't describe that adjustment.
Separate one-time change costs, such as revised engineering, obsolete materials, or work that must be redone, from ongoing labor and material costs for the replacement installation. This makes it easier to identify overlapping charges and ask why a particular expense belongs in the estimate.
Ask the contractor to connect each added charge to an actual task, purchase, or scheduling consequence.
Subcontractors can also initiate changes. A trade partner's request still needs review against the original scope; it isn't automatically an approved homeowner expense.
Prevent avoidable rework
Choose finishes before procurement, confirm window specifications before release, and resolve flashing details before installation. When something changes, track the affected purchase and crew activity rather than adding an unexplained delay allowance.
If payment becomes contested, Olson & Sons' discussion of settling unpaid change order claims offers context for understanding construction disputes. Clear scope definition and timely impact tracking give both parties a better record before a disagreement reaches that stage.
How a Change Order Moves From Request to Signature
A request isn't an approval. Between discovering a problem and authorizing a solution, the homeowner and contractor need to establish what's necessary, what it costs, and which activities can continue.
The overview below shows the main approval stages; the working checklist adds the decisions homeowners should make along the way.
Capture the request and decide what it means
Record the request immediately. Write down the date, location, proposed alteration, and reason; attach clear photographs when a site condition triggered it. Common slip: leaving a text message as the only record, without transferring the details into the project documents.
Classify it as required or elective. Ask whether the change addresses code, safety, structural integrity, or a preference. Common slip: treating an upgrade recommendation as mandatory without asking what requirement makes it necessary.
Identify what can continue. Have the contractor name the affected activity and explain whether unrelated work can proceed safely while you decide. Common slip: allowing crews to cover the condition or install dependent materials before the decision is settled.
A required repair and an elective upgrade can appear in the same proposal. Ask the contractor to separate them so you can approve the necessary work without inadvertently accepting an optional feature.
Price, approve, and close the change
Obtain a written estimate. Request quantities, labor assumptions or hours, materials, equipment, relevant subcontractor quotes, and the schedule activity affected. Common slip: accepting a total with no explanation of how the contractor calculated it.
Review the complete impact together. Discuss freight, waste, lead time, warranty implications, payment timing, and the revised completion date, not just the added amount. Common slip: agreeing to the price by phone while leaving the calendar unresolved.
Sign before procurement or installation. The homeowner and contractor should sign and date the agreed version, along with any other approval required by the contract. Common slip: ordering nonreturnable materials on a verbal yes while the written terms remain unfinished.
Close the order after completion. Match the completed work to the authorization, resolve any permitted quantity adjustments, and update the contract balance and payment record. Common slip: retaining several drafts without identifying which signed version controls billing.
If the quantity can't be established without opening more of the assembly, authorize a defined investigation first. State its limits and how the contractor will present the findings before expanding the repair. Don't sign an open-ended permission slip because the full condition isn't visible yet.
This video provides another way to review the change-order process.
Before committing: Have the contractor show you the exact work description, net adjustment, and revised completion information on the same approval document.
At Superior Home Improvement, we tailor every project to the customer's needs, style, and budget. You can ask us to walk through a pending change's itemized scope, schedule effect, and warranty implications before you sign. To discuss a project, request a free bid or call +1 (801)-466-6620.
For an ordinary mutually agreed residential change, use a signed order before ordering or changed work starts. Write up any verbal discussion the same day, but don't mistake a written account of the conversation for completed authorization.
Rights and Responsibilities of Homeowners and Contractors
A homeowner's signature records approval of a particular adjustment; it doesn't give either party unlimited control over the project. These are typical practical expectations, with the contract and applicable law determining the precise rights.
Homeowner and contractor duties in a change order
| Party | Typical Right | Typical Responsibility | Watch Point |
|---|---|---|---|
| Homeowner | Decline elective changes | Review estimates before signing | Required code or safety changes may not be optional |
| Homeowner | Ask for itemized pricing | Approve changes in writing before affected work | Verbal consent can leave scope and price disputed |
| Homeowner | Ask how delays affect completion | Account for the approved revised schedule | Delays may affect occupancy or financing arrangements |
| Contractor | Seek payment for approved changed work | Document scope, price, and time | Unsigned extra work may not be paid |
| Contractor | Withhold unauthorized changed work where the contract permits | Flag concealed conditions promptly with evidence | Late notice or documentation increases dispute risk |
| Contractor | Seek a supported schedule adjustment | Preserve applicable code and warranty requirements | Some substitutions can invalidate warranty coverage |
Required work isn't the same as an optional upgrade
Owner-requested changes start with a preference, such as selecting a different finish. You can generally decline the upgrade, although an earlier authorized purchase may already have created costs.
Contractor-discovered conditions require investigation. Hidden rot doesn't automatically establish who must pay; the contract's concealed-condition provisions, original scope, and documented facts matter.
Mandatory code or safety changes may be necessary to complete the job properly. The Georgia Department of Community Affairs' change-order FAQs illustrate this distinction in a public-program setting, where required changes and optional cosmetic requests receive different treatment and program approval can control. Those program rules aren't Utah private-remodeling law, but they demonstrate why declining a necessary correction can prevent completion.
Questions to settle before signing
- Required or elective: What makes this change necessary, and can the optional portion be removed?
- Work continuity: Can the project proceed without it, and which activities would stop?
- Delay charges: How are added supervision, overhead, or remobilization costs calculated?
- Warranty consequences: Will the substitute affect manufacturer coverage or promised energy performance?
A contractor's mistake doesn't become your expense merely because it appears on a change-order form. Ask how responsibility was determined before approving payment.
For disagreements, check the signed agreement and applicable state law. Put your objection in writing within the contract's notice window, retain the supporting records, and consult the dispute clause before escalating. Continue meeting undisputed obligations where required and safe, but don't assume federal rules requiring continued performance apply to a private residential contract.
Three Change Order Scenarios From Remodel Projects
A change order is a decision about money and calendar, and the three examples below show that decision running in each direction: work added by discovery, work added by choice, and work removed to cut cost. The quantities and durations are hypothetical terms picked to show how a properly written order should read.
Hidden decking damage during roof replacement
During a storm-damage roof replacement, the crew pulls off the old roofing and finds rotted decking underneath. The original price cannot have covered repairs that were concealed at signing. The contractor photographs the damaged areas, marks their locations, and counts the sheets needing replacement rather than proposing an unsupported allowance.
This is a required change, since the roof cannot be finished over rotten substrate. The written order lists the affected sheets at an agreed unit price and adds two days for re-sheathing and inspection. The homeowner reviews the evidence and signs before the new materials arrive, and the contractor identifies any temporary protection needed while approval is pending.
The signed order does two things. It authorizes the extra work, and it fixes the price before anyone can argue about whether concealed repairs belonged in the original bid.
Switching to triple-pane windows
Partway through planning a window installation, the homeowner asks for triple-pane units in place of the specified standard windows. Nothing went wrong on site. This is an elective upgrade, so the homeowner can decline it with no consequence to the project.
Before the contractor releases the replacement order, the written change confirms the model, dimensions, performance specifications, and installation requirements. It records the price difference between the original and replacement products, any return or cancellation charges on the first order, the special-order lead time, and the revised installation date.
Now the homeowner can weigh the upgrade on its real terms: more comfort and efficiency, more money, more waiting. Getting the decision in writing also prevents the homeowner from planning around an installation date the contractor can no longer meet.
Removing part of a siding package
A homeowner wants to spend less, so part of the planned siding package comes out. This change is also elective, but it runs in the opposite direction: the order credits money back instead of adding cost.
The contractor identifies the exact elevation and boundary, explains how the remaining siding will terminate, and states how the omitted area will stay weather-protected. The deductive change order sets out the credit, accounts for materials already committed for the removed section, and records the revised completion information. If dropping the work will not shorten the schedule because other activities still control completion, the document says so rather than letting the homeowner assume a faster finish.
The homeowner receives a defined reduction instead of expecting an unspecified discount on the final invoice. The contractor keeps a clear record of what the installation no longer includes.
Every scenario answers the same three questions: what changed, what it costs or credits, and what happens to completion. Required discoveries still need that answer in writing before work continues. Elective changes deserve it before you sign.
Superior Home Improvement offers exterior remodeling to your needs, style, and budget, including windows, roofing, and siding. Call +1 (801)-466-6620 or request a free bid to discuss the proposed scope, and ask us to review how any pending change affects your price, completion date, and warranty before you authorize it.
