Change Order Cost Calculator
Price construction change orders with itemized materials and labor, overhead, profit, and impact on the original contract.
What This Calculator Does
This calculator prices construction change orders by itemizing additional materials and labor, applying overhead and profit markups, and showing the impact on the original contract value. It supports multiple line items and produces a professional change order cost summary.
The Formula
Change orders are priced using the same cost buildup as the original bid: direct costs (materials plus labor at the applicable rate), overhead allocation, and profit margin. The total is added to the original contract value. Most construction contracts specify allowable markup percentages for change orders.
Step-by-Step Example
Enter original contract value
The current contract amount before this change. Example: $150,000.
Add change order items
For each scope change, enter the description, material cost, labor hours, and hourly rate. Example: Additional outlet relocation - $200 material, 4 hours at $65/hr.
Apply overhead and profit
Use the same rates as your original bid or as specified in the contract. Example: 25% overhead, 10% profit.
Review impact
See the change order total, new contract value, and the percentage change from the original contract.
Real-World Use Cases
Contract Administration
Price change orders consistently and transparently to maintain good client relationships and avoid disputes.
Project Budget Tracking
Monitor cumulative change orders as a percentage of the original contract to identify scope creep early.
Documentation
Create detailed change order breakdowns that satisfy contract requirements and protect against claims.
Common Mistakes to Avoid
Forgetting to include overhead and profit on change orders. Some contractors only charge direct costs for changes, which erodes profit on the overall project.
Not documenting the scope change in writing before performing the work. Verbal approvals lead to payment disputes.
Using a flat markup instead of the contractually specified method. Many contracts dictate allowable overhead and profit percentages for changes.
Not accounting for schedule impact costs when a change order extends the project timeline (extended general conditions, insurance, supervision).
Frequently Asked Questions
Accuracy and Disclaimer
Change order pricing must comply with your specific contract terms, which may dictate allowable markup percentages, documentation requirements, and approval procedures. This calculator provides a general pricing framework. Consult your contract and legal advisor for compliance with your project agreements.
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