Change orders: invoice approved extras before the work expands
Extra requests can erase a fixed quote if approval and billing lag behind the work. Turn agreed changes into a priced change order before starting.
Treat extra work as a fresh pricing event, not a favor hidden inside the original quote. Before starting the added task, compare it with the approved scope, price the new labor and costs, and carry the written approval into the next invoice.
Separate the request from the quote
When a client asks for more work, compare the request with the approved quote, revision limits, and assumptions. Mark what is already included and what changes deliverables, timeline, materials, taxable amount, or payment timing.
Price the added work before starting
Estimate labor, materials, subcontractors, rush time, and payment fees before treating the change as approved. Use the margin you need to decide whether the extra work should be a fixed add-on, hourly item, or separate quote.
Carry approval into the invoice
Send a short change-order quote or invoice line with the added scope, price, due date, and schedule impact. Confirm contract, consumer, licensing, tax, and collection rules for your location before pausing work or adding customer-facing fees.