Document the change (before you do the work)
Even a short written approval reduces disputes. Include what changes, cost impact, and schedule impact.
Use clear line items
Add change order work as separate line items with descriptions that match the approved scope.
Reference the change order on the invoice
Include a change order number and date so it’s easy to reconcile later.
Frequently asked questions
What is a change order?
A change order is an approved change to the original scope—adding, removing, or modifying work—with associated cost and timeline impacts.
How do I bill a change order?
Document approval, assign a change order number, describe the work clearly, and add it as separate line items on the invoice (or a separate change-order invoice).
Should change orders be separate invoices?
It depends. For small changes, adding line items to the next invoice may be fine. For larger changes, separate invoices can keep billing clean and reduce disputes.