🔨 Contractor Tools
Change Order Calculator
Price change orders correctly — covering extra labor, materials, admin, and profit.
Change order details
Fill in the details and click calculate.
Frequently Asked Questions
How should change orders be priced?
Same math as the original bid — labor, materials, overhead, profit — plus disruption cost: remobilization, schedule impact, and rework. Never price change work at cost to "keep the client happy."
Should change orders carry a higher markup than the base contract?
Often yes, 5–10 points higher. Mid-project changes disrupt sequencing and crew flow, and the pricing should reflect that reality. State your change-order terms in the original contract.
What is the golden rule of change orders?
No signature, no work. Verbal approvals become payment disputes. A one-page written change order with price and schedule impact, signed before work proceeds, prevents most contractor-client conflicts.
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