Construction pricing guide

Published by ChangeProof. Last updated: 2026-06-24.

How to Price a Construction Change Order

A practical guide for small contractors pricing extra work, hidden damage, upgrades, substitutions, credits, and schedule impact before turning the work into a customer-ready change order.

Direct answer

To price a construction change order, total the direct labor, materials, equipment, subcontractor, delivery, disposal, permit, and other project-specific costs. Add the overhead and profit permitted by your contract, account for credits or deductions, record any taxes or fixed fees, and document the resulting contract and schedule impact.

The contract may define the permitted pricing method.

Markup and overhead/profit percentages vary. No percentage in this guide is a universal industry requirement.

Review the project contract and applicable requirements before sending the change order.

Calculate Your Change Order Price See the worked example

1. Review the contract before pricing the change

The underlying contract may define the required pricing format, approval authority, documentation, and schedule-extension procedure. Check whether the change should be priced as lump sum, unit price, time and materials, cost plus, or another contract-defined method.

Allowed overhead and profit
Subcontractor markup and documentation
Required backup for labor, materials, equipment, and permits
Who can approve the change
How schedule extensions or no-impact statements must be handled

Contract language varies. This guide explains practical pricing steps, not legal, tax, or accounting advice.

2. Define the changed scope

Before pricing, define exactly what is being added, deleted, substituted, excluded, or delayed. Tie the description to rooms, areas, drawings, selections, or field conditions when possible.

Weak

Repair wall damage.

Better

Remove water-damaged pantry-wall sheathing discovered after demolition, replace affected framing, install moisture-resistant drywall, tape, texture, and prime the repair area.

3. Calculate direct labor

Estimate the labor hours required for the changed work. Include the crew mix, wage or burdened labor cost as appropriate, direct supervision involved in the change, overtime only when it applies, and mobilization or remobilization when the change causes it.

Avoid assuming every payroll-related cost is recoverable. The contract or pricing method may define which labor costs belong in the change order.

4. Add material costs

Price material quantity, unit price, freight or delivery, waste, taxes where applicable, price changes, restocking charges, and deleted-material credits. Supplier quotes and delivery tickets make the price easier to explain later.

5. Add equipment and tool costs

Include rented equipment or equipment usage directly associated with the change, along with delivery, pickup, fuel, and consumables where appropriate. Small tools may be handled differently by different contracts, so check the pricing method.

6. Add subcontractor costs

Review each subcontractor proposal for scope alignment, exclusions, schedule impact, and supporting documentation. If the contract permits contractor markup on subcontractor work, apply only the allowed method and basis.

7. Add permits, disposal, protection, and other direct costs

Other direct costs can include permits, inspections, disposal, protection of finished work, temporary facilities, engineering, design support, additional testing, or expedited delivery. Capture these costs while the reason for the change is still fresh.

8. Add overhead and profit

Overhead is not the same as profit, and markup is not the same as margin. The contract may cap percentages, define the basis that a percentage applies to, or treat some support costs as already included elsewhere.

ChangeProof calculator formula

Direct costs + overhead + profit markup + fixed fees = change-order amount

This is the ChangeProof calculator's current transparent method. It is not a universal contractual formula.

Open the calculator

9. Account for additions, deductions, and credits

A change order can be positive, negative, or a net combination of additions and credits. Include deleted work, returned material credits, unused allowances, and substitutions. Avoid applying markup to amounts where the contract does not permit it.

10. Calculate the revised contract total

Original contract amount + previously approved changes + current change order = proposed adjusted contract total

A complete change order should make the financial effect easy to understand, especially when multiple prior changes have already adjusted the project price.

11. Document schedule impact

State whether the change adds or removes calendar days or working days. Note material lead times, inspection delays, sequencing consequences, or a no-schedule-impact statement when that is accurate. If the revised completion date is known, include it.

12. Review and obtain approval before extra work

The practical sequence is to define scope, calculate price, document schedule impact, prepare the change order, obtain the required approval, retain the decision record, and update project records.

Not every project uses the same approval method. Some require a physical signature, while others allow a written, electronic, or contract-defined approval process.

Worked fictional example

Hidden pantry-wall damage during a kitchen remodel

Fictional example percentages, not recommended or universal rates. This example uses a 10% overhead calculation and a 15% profit markup on direct cost plus overhead only to show the math.

Labor	$1,200.00
Materials	$550.00
Equipment	$100.00
Subcontractors	$0.00
Disposal/delivery/other	$75.00
Direct cost	$1,925.00
10% overhead on direct cost	$192.50
Subtotal before profit	$2,117.50
15% profit markup on direct cost plus overhead	$317.63
Fixed fees	$25.00
Change-order total	$2,460.13
Original contract	$45,000.00
Previously approved change orders	$2,500.00
Adjusted contract total	$49,960.13
Schedule impact	Adds two working days.

Open These Numbers in the Calculator Download the Free Construction Change Order Template Create a Change Order Online

Pricing-method comparison

Method	How it works	Useful when	Watch for
Lump sum	The contractor proposes one total price for the changed scope.	The scope is clear enough to price before the work begins.	Hidden exclusions, unclear schedule impact, or missing credits.
Unit price	The change is priced using agreed rates per unit, such as each fixture or linear foot.	Quantity may vary but unit rates are defined or easy to document.	Measurement rules, minimum charges, and whether overhead or profit is already included.
Time and materials	Labor time, material invoices, equipment, and other direct costs are documented as they occur.	The scope is urgent or uncertain and the contract permits this method.	Required records, labor-rate rules, and customer approval before costs grow.
Cost plus	Actual allowable costs are documented, then overhead, fee, or profit is added using the project method.	The contract defines allowable cost categories and markup basis.	Contract caps, excluded costs, and double-counted overhead.
Credit/deductive change	Deleted work or returned material is credited back and netted against additions when applicable.	The customer removes work, substitutes a lower-cost item, or returns unused material.	Whether markup is allowed on credits, restocking fees, and documented deleted scope.

Cost-category checklist

Use this as a documentation checklist, not estimating software. The contract should still decide which categories and support are required.

Category	What to consider	Useful support	Contract check
Labor	Expected hours, crew mix, direct supervision, overtime only when applicable, and remobilization tied to the change.	Daily notes, time records, field notes, or crew schedules.	Check allowed rates, burden treatment, supervision rules, and emergency-work procedures.
Materials	Quantity, unit price, waste, freight, delivery, taxes where applicable, price changes, and return credits.	Supplier quotes, invoices, delivery tickets, and takeoff notes.	Check whether taxes, delivery, waste, restocking, or deleted-material credits are recoverable.
Equipment	Rented equipment, project equipment used directly on the change, pickup, delivery, fuel, and consumables.	Rental quotes, tickets, usage logs, and delivery records.	Check rates, small-tool rules, standby time, and whether ownership costs are permitted.
Subcontractors	Sub proposal amount, included scope, exclusions, timing, coordination, and permitted contractor markup.	Subcontractor quote, scope sheet, exclusions, and schedule notes.	Check subcontractor-markup basis, documentation requirements, and excluded costs.
Delivery/freight	Special delivery, freight, expedited shipping, or pickup required by the changed work.	Freight quotes, delivery tickets, and receipts.	Check whether delivery is direct cost or already included in another rate.
Disposal	Hauling, dumpsters, landfill fees, hazardous-material handling, or cleanup tied to the changed scope.	Receipts, dump tickets, photos, and scope notes.	Check whether disposal is directly billable and whether special handling requires approval.
Permits/inspection	Permit changes, inspection fees, reinspection fees, or jurisdictional charges caused by the change.	Permit receipts, fee schedules, and inspection notices.	Check who pays permit changes and whether approvals are required before proceeding.
Temporary protection	Dust control, floor protection, temporary walls, weather protection, or security needed for the change.	Photos, material receipts, and field notes.	Check whether protection is included in general conditions or separately priced.
Engineering/design	Design support, engineering review, revised drawings, testing, or specialty review.	Professional proposals, invoices, and revised documents.	Check authorization, professional-fee rules, and who directs the design change.
Overhead	Business or project support cost permitted by the contract method.	Contract clause, pricing exhibit, or written pricing rule.	Check the percentage, basis, cap, and whether overhead is already included elsewhere.
Profit	Profit markup or fee allowed by the contract or customer agreement.	Contract clause, pricing exhibit, or customer-approved terms.	Check the permitted percentage and whether it applies to direct cost, cost plus overhead, or another basis.
Taxes/fees	Applicable taxes, fixed fees, card fees, jurisdictional fees, or other project-specific charges.	Fee schedules, invoices, receipts, and tax guidance from an appropriate professional.	Check whether these costs are direct, included in markup, or excluded.
Credits/deductions	Deleted work, returned material, unused allowances, or lower-cost substitutions.	Original scope, supplier credits, return receipts, and revised selections.	Check whether credits are netted before markup and how deductive changes are handled.
Schedule impact	Added or removed calendar or working days, lead time, inspections, sequencing, and revised completion date.	Schedule excerpts, lead-time notices, inspection dates, and field notes.	Check notice requirements, time-extension procedure, and approval authority.

Common pricing mistakes

Pricing before the changed scope is defined.
Forgetting deleted-work credits.
Omitting labor burden or direct support costs when they apply and are allowed.
Double-counting overhead.
Confusing markup with margin.
Missing subcontractor exclusions.
Omitting permit, disposal, delivery, or protection cost.
Using a percentage that is not permitted by the contract.
Failing to state schedule impact.
Starting work before the required approval.
Failing to retain supporting records.

Transparent formulas

Change-order amount

Direct costs + overhead + profit markup + fixed fees

Proposed adjusted contract total

Original contract amount + previously approved changes + current change order

Limits

This guide does not provide legal, tax, or accounting advice and does not prescribe a universal markup percentage. Contract terms, project requirements, jurisdictional rules, and customer agreements can change the right pricing method.

FAQs

How do you calculate a construction change order?

Define the changed scope, total the direct labor, materials, equipment, subcontractor, and other project-specific costs, then apply the overhead, profit, fees, credits, and schedule-impact method required by the contract or customer agreement.

What costs should be included in a change order?

Common categories include labor, materials, equipment, subcontractors, delivery, disposal, permits, protection, engineering or design costs, overhead, profit, taxes or fees, credits or deductions, and schedule impact. The contract may limit or define what is allowed.

How much markup should a contractor add to a change order?

There is no universal markup percentage. The contract may define or cap overhead, profit, subcontractor markup, or fee percentages. Use the method applicable to the project and avoid presenting any example percentage as a required rate.

Is change-order markup the same as profit margin?

No. Markup is a percentage added to a cost basis. Margin measures profit as a percentage of the final price. A 15% markup is not the same as a 15% margin.

Should overhead and profit be included?

Overhead and profit may be included when the contract, pricing exhibit, or customer agreement permits them. The contract may also cap percentages, define the basis, or treat some costs as already included.

How do you price a deductive change order?

Identify the deleted scope, calculate the value of omitted labor, materials, equipment, subcontractor work, or other costs, then apply the contract's method for credits, restocking, and markup. Avoid assuming markup applies to credits unless the project rules allow it.

Should a change order include a revised contract total?

Yes, when possible. Showing the original contract amount, previously approved changes, current change order, and proposed adjusted contract total makes the financial effect easier to understand.

Should a change order include schedule impact?

Yes. State added or removed calendar or working days, known lead-time effects, inspection delays, sequencing consequences, or that there is no schedule impact when that is accurate.

Can a contractor start extra work before approval?

The practical sequence is to define the scope, price it, document schedule impact, prepare the change order, obtain the required approval, and retain the decision record. The required approval method depends on the contract and applicable rules.

Does ChangeProof calculate and document the price?

Yes. The free calculator helps calculate the price, the template provides a printable document, and the generator creates a customized Change Order PDF. After signup, ChangeProof can also create an approval link and proof packet when a customer decision exists.

Sources and further reading

Case Western Reserve University - Pricing of Construction Contract Change OrdersOwner-specific pricing exhibit revised July 2010. Useful as an example of contract-defined pricing provisions, not current universal guidance.Caltrans Construction Manual - Contract Change OrdersConstruction Manual Section 5-3, published July 2025. Caltrans-specific administration guidance on construction contract change orders and records.Washington State Auditor - Best Practices for Change OrdersBest Practices for Change Orders, updated January 2026. Owner/public-works guidance for documentation and controls, not a universal private-contract standard.AIA Contract Documents - The Fundamentals of Change Orders in ConstructionContract-document publisher guidance on what change orders are and how they change construction contracts.AIA Contract Documents - Contractors' Overhead and Profit on Change OrdersContract-document publisher guidance showing why overhead and profit treatment depends on the contract and change type.

Turn the price into a change order

The guide explains the pricing process. The calculator performs the math, the template gives you a printable document, and the generator creates a customized Change Order PDF.

Change Order Cost & Markup CalculatorCalculate labor, materials, overhead, profit markup, fees, and adjusted contract total.Free Construction Change Order TemplateDownload a blank PDF template or customize it online.Free Change Order GeneratorCreate a customer-ready Change Order PDF for the priced scope.Unapproved Extra Work Cost CalculatorEstimate the annual cost of starting extra work before approval.