A contractor sends a change for an upgraded finish. The total includes the new material, but the proposal does not explain what happens to the material already included in your agreement. Before comparing prices, ask for both sides: what is added and what is removed or credited.
This article gives an owner review method, not a finding about a contractor's conduct or a legal decision. A disputed charge, concealed condition or safety issue may need qualified local assessment or advice.
Start with the accepted document
Identify the contract line, selection or drawing that the change affects. Keep its revision and date. The FTC's home-improvement guidance recommends written estimates describing work, materials, completion and price, and notes that contract requirements vary by state. Apply the same care when asking for a clear explanation of a change.
Free six-question review checklist
Copy these questions into your notes and add the change ID to each answer. Missing evidence is an open question; it is not a zero cost.
- Baseline: Which accepted line is being changed, and which revision proves it?
- Difference: What work, materials, quantities and supporting work are added or deleted?
- Credits: What happens to the original allowance or unused purchase? Are returns or restocking fees documented?
- Price bridge: What exact bases do markup and tax apply to, and are they already included?
- Timing: What milestone and payment trigger change? Do delay periods overlap?
- Decision: What remains unresolved, and what approval evidence is required before proceeding?
A credit can change the calculation
Here is an original hypothetical USD example, not a local price benchmark. Added material is $1,280 and labor is $360. The provider confirms a $900 credit. Under an assumed 10% markup on the net direct amount, with no additional tax or fees:
- Net direct change: $1,280 + $360 - $900 = $740.
- Assumed markup: $740 × 10% = $74.
- Proposed net change: $740 + $74 = $814.
If the proposal instead shows $1,804, ask whether it applied 10% to $1,640 and omitted the credit. The $990 difference only follows from the assumptions above. Actual return conditions, fees and percentage bases may differ. Request a revised written reconciliation; this example is not evidence that anyone owes you $990.
Separate an estimate from an accepted change
Put pending changes beside the accepted contract total, rather than inside it. For example, a $40,000 original contract with an accepted $814 addition and $600 credit has a current accepted value of $40,214. A separate pending request remains a forecast exposure until the appropriate decision and documentation are complete.
California CSLB describes written change orders signed by both parties before the covered change. That is a California-specific rule, not a nationwide approval standard. Check your own agreement and local requirements. An owner checklist is not an executable change-order form.
Ask about related work and dates
An equipment or finish change can leave restoration, disposal or delivery outside the new quote. Ask who performs each item, how it is priced and whether it already appears elsewhere. A shared mobilization charge should not silently appear in two change totals.
The Mississippi State Board of Contractors consumer contract guide (PDF) identifies detailed scope, payment schedules, start and completion dates, permit responsibilities and warranties as important contract records. It supplies local consumer context; it does not replace a review of the requirements where you live.
A price can fit while its due date does not
Keep the approved value, household forecast and payment timing separate. If a modeled $4,000 contractor payment and $450 owner purchase fall in the same period, they need $4,450. Available funds of $3,500 leave a $950 timing gap. This is an invented planning example, not a suggested financing arrangement or a payment demand.
Finish with one concrete next step
Record either the properly documented decision or the precise missing answer, its owner and requested response date. Keep the old proposal when a revision arrives. Later, match each invoice line to the accepted change ID and prior billing.
Use the free contractor quote comparison calculator for initial proposal comparisons. For an ongoing project, the Change-Order Cost Control Workbook adds three complete cases, six reusable record sheets and 30 fillable fields across 22 pages. It costs £9.99 GBP; the examples are USD. You can use this free checklist without buying the PDF.
Already own our general renovation or contractor comparison book? Those introduce change budgets. The new workbook focuses on the change-review packet; another purchase is optional. There are no verified customer outcomes or purchase-demand findings yet.
Primary links checked October 26, 2026. All calculations and checklists are original teaching material. Sources do not endorse HomeCostEngine. This article is educational planning guidance, not technical, legal or tax advice.