Free construction change-order estimator
Calculate direct construction change costs, overhead and an estimated selling price using a target gross margin.
Change order
Price a proposed scope change using labor, materials, equipment and subcontract cost.
How to use this calculator
Why write up a change?
A written change order helps document what is changing, why, price adjustments and schedule impact. The required authorization process depends on your contract.
How pricing works
Add labor, materials, equipment and subcontract costs. Apply an overhead allowance, then divide the resulting cost by one minus target gross margin.
Approval comes first
This calculator does not create contractual authorization. Document scope, exclusions, potential schedule changes and approval in the format required by your agreement.
These are general estimating aids, not industry standards or professional advice. Check your actual rates and contract.