You quoted $4,800. Then they asked for the bonus-room duct and a Saturday start. If that extra work is not on a page they sign, it comes out of your weekend.

Change Order Desk is a one-file browser desk for US 1099 / service operators. Enter the original quote, deposit already paid, and extra lines. It prints a one-page change order with original, extras, revised total, remaining balance, and signature blocks. A Python CLI does the same math from JSON. Nothing is uploaded.

WHAT YOU GET
• change-order-desk.html — runs offline
• changeorder.py + sample-change-order.json (Python 3.10+, no pip)
• example-output.md from that sample (Oak St: original $4,800.00, extras $600.00, revised $5,400.00, remaining $3,960.00)
• Personal or commercial license

HOW IT WORKS

1. Open the HTML file
2. Load the Oak St sample or type your job
3. Add extra lines
4. Print the change order before the extra work starts

NOT THIS
Educational change-order arithmetic. Not a lawyer-drafted contract, not licensed legal advice, and not a promise anyone will sign or pay. 365-day download access (you keep files you downloaded). 7-day refund if the HTML will not run or changeorder.py errors on sample-change-order.json.