A written change order turns an informal renovation request into an agreed scope, price, schedule, and record. Use the checklist and copy-ready template below before any changed work begins, then keep the approved document with your contract, invoices, and project photos.
Overview
A contractor change order is a document that modifies the original agreement. It may add work, remove work, substitute materials, adjust the completion date, or record unexpected conditions that were not reasonably visible when the estimate was prepared. A change order is not simply a revised invoice or a text message saying, “We will take care of it.” It should show what changed and how that change affects the project.
Good documentation protects both the homeowner and the contractor. The homeowner can compare the approved change with later invoices, while the contractor has a clear record of the requested scope and authorization. This is particularly important for bathroom renovations, kitchens, flooring, windows, HVAC work, appliance installation, and other projects where one concealed condition can affect several trades.
Before signing, confirm that the change order answers these questions:
- What work or material is being added, removed, or replaced?
- Why is the change needed or requested?
- What are the separate labor, material, permit, disposal, and other costs?
- What is the revised completion date or schedule impact?
- Does the change affect permits, inspections, code-related work, or access requirements?
- How will payment be handled, and when is it due?
- Does the change affect a warranty, product guarantee, or responsibility for future repairs?
- Who approved it, and when?
Keep the change order connected to the original contract rather than treating it as a separate, unexplained agreement. If you are still comparing proposals, the line-by-line approach in How to Compare Contractor Estimates can help you identify whether the proposed change overlaps with work already included in the base scope.
How to estimate
Estimate each change using the same categories used in the original proposal. A simple calculation is:
Change total = added labor + added materials + equipment or delivery + permit or inspection costs + disposal or protection costs − credits for removed work
Ask the contractor to show quantities and units where practical. “Additional tile” is less useful than “remove and replace approximately 18 square feet of damaged tile, including adhesive and grout.” The exact quantity may remain an estimate until demolition is complete, but the assumption should be stated.
For labor, record the estimated hours, number of workers or trades, and applicable rate or lump-sum amount. For materials, identify the product, size, finish, model, allowance, and whether tax, delivery, or handling is included. For a substitution, document both the original item and the replacement so the price difference is visible.
Use a running project cost log alongside the individual change orders. Suggested columns include:
- Change order number and date
- Description and reason
- Added labor
- Added materials and delivery
- Permits, inspections, disposal, or other charges
- Credit for deleted work
- Net change
- Approved payment and amount paid
- Schedule impact
- Invoice reference and photo location
Then calculate the revised contract value as: original contract amount + approved additions − approved credits. Do not add proposals that were discussed but declined, and do not count an unapproved allowance as a completed change. For broader planning, compare this log with the labor, material, permit, and contingency assumptions in the Home Renovation Cost Calculator and Planning Guide.
Inputs and assumptions
Use the following copy-ready template for each proposed change. Both parties should receive the completed version before the changed work begins, except where immediate action is necessary to protect people or prevent significant property damage. In an urgent situation, document the reason, photographs, temporary work, and expected cost as soon as possible.
CONTRACTOR CHANGE ORDER
Project: [property address or project name]
Original contract date: [date]
Change order number: [number]
Date proposed: [date]
Requested or discovered change:
[Describe the work, material, area, quantity, and finish in specific terms.]
Reason for change:
[Homeowner-requested upgrade, concealed damage, unavailable product, design correction, code or permit issue, or other reason.]
Work included:
[List demolition, preparation, installation, testing, cleanup, and protection.]
Work excluded:
[Identify anything not included, such as painting, moving furniture, patching adjacent surfaces, or electrical upgrades.]
Cost detail:
Labor: [hours or lump sum] × [rate, if applicable] = [amount]
Materials: [items, quantities, and specifications] = [amount]
Delivery, equipment, disposal, permits, or inspections = [amount]
Credit for removed work = [amount]
Net change: [amount]
Schedule:
Work begins: [date or project phase]
Added or reduced duration: [days or hours]
Revised substantial completion date: [date]
Permit and inspection impact:
[None known, permit required, inspection required, or confirmation pending. Identify who is responsible for obtaining and scheduling it.]
Payment terms:
[Due with next progress payment, upon material delivery, at completion, or another agreed milestone.]
Warranty impact:
[No change, revised product warranty, workmanship limitation, or separate warranty document attached.]
Attachments:
[Before-and-after photos, drawings, product links, samples, measurements, invoices, or manufacturer instructions.]
Approval:
Homeowner name and signature: __________________ Date: ________
Contractor name and signature: __________________ Date: ________
Photographs should show context as well as detail. Take a wide image identifying the room, a closer image of the condition, and additional images after removal or installation. Label files with the date and change order number. For appliance work, product details and site preparation can matter; use the Appliance Installation Checklist when a change involves a dishwasher, range, washer, dryer, or similar equipment.
Worked examples
Concealed damage
During a bathroom demolition, a contractor finds damaged subfloor beneath the existing shower. The change order should describe the visible condition, attach photographs, identify the affected area, and separate removal, replacement, drying, and disposal. It should also state whether the shower installation must pause and whether the completion date moves. Waterproofing is a separate quality checkpoint, so the homeowner should confirm the revised scope before tile covers the work. The installation sequence in Bathroom Renovation Installation Order provides useful context for checking that dependencies are documented.
Material substitution
A selected flooring product becomes unavailable. The change order should name the original product, the proposed replacement, the reason for substitution, the price difference, and any effect on installation method, lead time, warranty, appearance, or maintenance. A sample or product sheet should be attached. If the replacement costs less, record the credit rather than leaving the original allowance unchanged.
Homeowner-requested upgrade
A homeowner chooses upgraded cabinet hardware after the kitchen scope is signed. The change should list the new model or finish, quantity, labor difference, delivery timing, and any credit for the original hardware. It should not be bundled into a vague “kitchen extras” line. A precise description helps prevent a disagreement about whether installation, drilling, patching, or return handling is included.
System-related decision
If an HVAC project changes from repair to replacement, document the reason for the revised recommendation, the equipment specifications, included removal, disposal, connections, testing, controls, and warranty documents. The homeowner should compare the revised scope with the original repair proposal and ask whether any previously paid diagnostic or preparation work is credited. The repair-or-replace HVAC guide can support that conversation without replacing the contractor’s site-specific assessment.
When to recalculate
Recalculate the project total whenever a change is proposed, approved, rejected, credited, invoiced, or completed. Do not wait until the final invoice. At each update, reconcile the running log against the original contract and mark every item as proposed, approved, completed, paid, or disputed.
Revisit the schedule after changes involving demolition, concealed conditions, custom materials, inspections, weather exposure, or multiple trades. Revisit warranty language when a product, installation method, or responsible trade changes. Revisit permit assumptions before work that alters structure, electrical, plumbing, HVAC, safety systems, or other regulated elements; requirements vary by location and project, so confirm with the contractor and the relevant local authority.
Before final payment, assemble the signed contract, approved change orders, receipts or invoices, product documents, permits where applicable, test results, and before-and-after photos. Use a final walkthrough and punch list to verify changed work, then compare the final invoice with the approved log. The Home Improvement Final Walkthrough Checklist can help organize testing, photographs, unresolved items, and warranty handoff.
The practical rule is simple: pause whenever the scope changes, write down the consequences, obtain approval, and update the total before work proceeds. A change order cannot eliminate every renovation surprise, but it can make surprises visible, priced, and manageable.
