Most contractors do not struggle with change orders because they do not know the work. They struggle because the process is loose.
The customer asks for a small change. The contractor says yes to keep things moving. The crew does the extra work. A week later the bill is bigger than expected, the customer is confused, and everyone feels like the other side changed the deal.
That is the real job of a change order: document the change before the work happens.
Download the template: Need a fill-in example for your next extra work request? Download the sample change order PDF.
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A good change order protects margin, keeps the relationship intact, and gives the customer a fair chance to approve the revised scope, cost, and timeline.
What is a change order?
A change order is a written revision to an already approved project.
It records a change in one or more of these areas:
- Scope
- Price
- Schedule
- Materials
- Quantities
- Terms
A change order is not just extra billing. It is the document that explains why the contract amount or job scope changed.
When contractors should use a change order
Use a change order when:
- The customer adds work
- The customer removes work
- The customer upgrades materials or finishes
- Hidden conditions require additional labor or materials
- Quantities change materially from the original estimate
- Schedule changes affect cost
- A substitution changes the price
Examples:
- Customer adds a walkway to a patio project
- Driveway thickness changes from 4 inches to 5 inches
- Demo reveals rotten subfloor not visible at estimate stage
- Landscaping customer adds lighting after approving the original install
If the cost or scope changed, write it down.
Why change orders matter
A lot of contractors treat change orders like bureaucracy. In reality, they solve three expensive problems.
1. Scope confusion
Without a written change, the customer may think it was included.
2. Margin erosion
Small extras pile up. Two hours here, extra material there, another trip tomorrow. That work is real cost.
3. Billing disputes
If the customer never approved the revised amount, your final invoice becomes the first time they hear about it.
What a construction change order should include
| Section | What to include |
|---|---|
| Reference info | Original estimate or contract number, job name, customer, date |
| Change order number | Unique identifier, such as CO-1048-1 |
| Description of change | What is changing and why |
| Added work | Labor, materials, equipment, subcontractors |
| Removed work | Credits for deleted scope |
| Net change | Added amount minus credits |
| Schedule impact | Added days or revised completion timing |
| Approval | Signature and date before work proceeds |
Include the reason for the change. It helps later.
Change order pricing formula
Net Change Order Amount = Added Costs + Overhead/Profit - Deleted Scope Credit
Example:
Added work:
- Extra concrete walkway: $1,250
- Drainage adjustment: $420
Deleted work:
- Removed planting bed: $300 credit
Net Change = $1,250 + $420 - $300 = $1,370
If the change affects time, note that separately.
How to price change orders fairly
Contractors who handle change orders well tend to use the same estimating logic they use on original bids:
- Labor hours times loaded rate
- Materials plus markup
- Equipment
- Subs
- Overhead and profit
- Any schedule disruption costs if justified
Example labor formula:
Added Labor Cost = Hours x Loaded Rate
If a change adds 10 crew hours at $52/hour:
10 x $52 = $520
Sample construction change order
Example: Patio project with added walkway
Original project:
- 400 sq ft patio
Customer requests:
- Add 80 sq ft walkway after the original estimate is accepted
| Change item | Quantity | Unit | Unit price | Total |
|---|---|---|---|---|
| Add concrete walkway | 80 | sq ft | $11.50 | $920 |
| Additional forming | 32 | linear ft | $5.00 | $160 |
| Extra excavation and base prep | 80 | sq ft | $1.85 | $148 |
| Additional cleanup | 1 | flat rate | $95 | $95 |
Added amount: $1,323
Deleted amount: $0
Net change order total: $1,323
Schedule impact: Adds 1 working day
Sample change order for deleted scope
Not all change orders add money.
Example:
- Customer decides not to install two landscape lighting fixtures
| Change item | Quantity | Unit | Amount |
|---|---|---|---|
| Credit for removing 2 path lights | 2 | each | -$290 |
Net change order total: -$290
Use a written change order for credits too.
What to say in the description
A strong description is specific and neutral.
Bad:
- Extra work
Better:
- Customer requested addition of 80 sq ft concrete walkway connecting patio to side gate after acceptance of original patio estimate.
Bad:
- More labor needed
Better:
- After demolition, unstable subgrade was discovered in the driveway area, requiring additional excavation, base material, and compaction not visible during initial site visit.
Common change order scenarios
Hidden conditions
Examples:
- Rot
- Poor subgrade
- Buried debris
- Drainage issues
- Non-code previous work
Customer upgrades
Examples:
- Upgrade from standard pavers to premium product
- Change from broom finish to stamped concrete
- Upgrade from basic shrubs to larger container plants
Quantity changes
Examples:
- More square footage than originally measured
- Added retaining wall length
- Additional trim or fencing
Schedule-related changes
If the customer delays selections, pauses work, or requests resequencing that costs money, document it.
Common change order mistakes
1. Doing the work first
If the change is billable, get approval first whenever possible.
2. Explaining verbally but not in writing
Customers forget. Verbal approval is weak protection.
3. No price breakdown
Itemized changes are easier for customers to trust.
4. No schedule impact listed
If the change adds a day or pushes completion, write it down.
5. Not showing credits for removed work
Fair credits build trust.
6. Rolling changes into the final invoice
This turns one conversation into an argument at the end of the project.
7. Using vague numbering or no numbering at all
Change orders should be easy to track.
Change order template
Use this structure:
Header
- Company name
- Change order number
- Date
- Customer name
- Job name and address
- Original estimate or contract reference
Description of change
Explain what is changing and why.
Pricing table
| Item | Qty | Unit | Price | Total |
|---|
Summary
- Added amount
- Deleted amount or credit
- Net change
- Revised contract total if applicable
Schedule impact
- No schedule change
- Adds X working days
- Revised completion target
Approval
- Customer signature
- Date
- Contractor signature if desired
How change orders affect invoicing
Once approved, a change order should feed directly into billing.
The cleanest final invoice shows:
- Original contract amount
- Approved change orders
- Payments received
- Current balance due
That way the customer does not feel like new charges appeared out of nowhere.
Keeping change orders organized
Estimation Builder lets contractors create a change order directly from an accepted estimate, using the original line items as a starting point. From there, you can add, remove, or modify items, assign a separate change order number, and export it as a PDF.
That is useful because change orders are usually not brand-new jobs. They are revisions to an existing one. Starting from the accepted estimate reduces retyping and makes it easier to show exactly what changed.
Final takeaway
The best time to manage a change order is before the extra work starts.
If the scope changes, document it. If the price changes, write it down. If the schedule changes, say so clearly.
For a clean example, download the sample change order PDF. If you want change orders created directly from accepted estimates and turned into invoices later, start Estimation Builder's 30-day free trial. No credit card is required.