A change order markup calculator handles the arithmetic; it does not decide what the contract allows. Enter the labor, material, and other direct costs for the added scope, then enter the markup rate permitted or agreed for that change. The calculator returns the direct-cost total, markup dollars, and proposed change-order price.
The governing contract and applicable law control allowable cost categories, markup rates or caps, notice, authorization, and the pricing method. For example, a 20% markup on $4,000 of direct cost adds $800 and produces a $4,800 price. Use that result as a documented proposal, then follow the contract procedure for approval, written directives, or emergency work before committing labor or material.
How to Use the Calculator
Enter the cost buckets the governing contract permits for the added scope. Labor should be the allowed loaded or burdened labor cost, not automatically the raw wage. Material should reflect the allowed delivered cost. Other can capture permitted equipment, subcontractor, fee, or similar costs without double counting. Then enter the contract rate or the rate the parties agree for the change.
If the contract sets different rates or caps by cost category, run the categories separately and combine the permitted results. Use the labor-burden calculator when the estimate starts with wage rates rather than loaded labor cost.
Direct cost = labor + material + other permitted direct costs.
Markup amount = direct cost × markup rate.
Proposed change-order price = direct cost + markup amount.
For $2,000 in labor, $1,500 in material, and $500 in other costs, the direct-cost total is $4,000. At a 20% markup, the markup amount is $800 and the proposed price is $4,800. This is markup on cost, not margin as a share of final price. The calculator does not determine whether every input or the selected rate is recoverable under a specific contract.
Let the Contract Set the Pricing Rules
Do not assume a change order automatically earns a higher markup than the base bid. Start with the change clause. It may set rates, caps, allowable cost buckets, notice deadlines, supporting records, and who can authorize the work. If it is silent on rate, seek written agreement on the pricing method instead of treating a calculator result as an entitlement. Disruption and resequencing can create real cost, but include them only when the contract and applicable law permit them and the records support them.
For federal construction and architect-engineer contracts in FAR 31.105, the cost principles apply to covered contracts and contract modifications when cost analysis is performed. The rule also lists pricing changes and other contract modifications among its uses (FAR 31.105). That is a limited federal rule, not a default markup framework for private or state work.
Markup Is Not Margin
Keep the terms straight in the proposal. This calculator applies markup to cost: a 20% markup on $4,000 adds $800. The resulting $800 divided by the $4,800 price is a 16.67% margin, not 20%. If the agreement uses margin terminology, convert deliberately rather than entering the same percentage as markup. State the cost base, markup rate, markup dollars, and final proposed price. Use the construction markup calculator when a target margin must be converted to markup.
Follow the Notice and Authorization Procedure
Read the change clause before added work starts. Give notice in the required form and on time, identify the scope and schedule effect, attach cost support, and obtain the authorization the contract requires. A signed change order often provides the clearest record, but some contracts also use written directives, construction change directives, or emergency-work procedures. Follow the method that actually governs the job.
Written authorization improves the payment record; it does not guarantee payment. Keep the request, response, daily reports, labor hours, material invoices, equipment logs, subcontractor quotes, and schedule impact together. If price cannot be agreed before urgent work, document the directive and reserve the cost and time impact in the manner and deadline the contract requires.
Change Order Reference
| Reference |
Calculation or action |
Check before use |
| Direct cost |
labor + material + other |
Include only permitted, supported cost buckets |
| Markup amount |
direct cost × markup rate |
Use the contract rate, cap, or agreed rate |
| Proposed price |
direct cost + markup |
A calculation is not authorization |
| Markup vs margin |
20% markup = 16.67% margin |
The percentages use different denominators |
| Authorization |
Follow notice and approval terms |
Signed order, written directive, or emergency procedure |
FAQ
How do you price a change order?
Total the permitted direct costs for the added scope, then apply the markup rate or pricing method allowed by the contract or agreed for the change. The calculator returns direct cost, markup dollars, and a proposed price.
What markup should I use on a change order?
Use the rate or cap in the governing contract. If the contract is silent, seek written agreement on the pricing method before work when possible. Applicable law and the contract control what is recoverable.
Is markup the same as margin on a change order?
No. Markup is calculated on cost; margin is measured against price. A 20% markup produces a 16.67% margin. State the cost base, rate, markup dollars, and proposed price.
Should the change order be signed before the work?
Follow the contract notice and authorization procedure. A signed change order before work is usually the clearest record, but the contract may also allow a written directive or emergency-work process. Written approval supports the record but does not guarantee payment.