Stop giving away extra work.
A client asks for one more thing. You say yes. Your margin disappears. ChangeMargin Pro helps you price extra work, print the change order and track its approval.
One-time payment · No account · No subscription · English / Español
CO-004 · Kitchen remodel
Proposed total · example
“While you’re here, can you also…”
Extras get agreed verbally
Nobody writes down the new scope or price, so there is nothing to point to later.
Pricing happens on the spot
Without markup and tax, a ‘small’ extra quietly eats your profit.
Approvals get lost
Texts and notes scatter across phones. Which changes were approved?
Three steps to protect your margin.
- 01
Describe the change
Add it to the project’s change-order register.
- 02
Price it
Labor hours × rate + materials + other costs + markup % + sales tax %.
- 03
Print and track approval
Print the order with signature lines, send the pre-filled email, mark it draft, sent, approved or declined.
What should you charge for that extra?
Same pricing logic as ChangeMargin Pro. Example numbers until you edit them. Nothing you type leaves your browser.
Direct costs: $600.00
Gross profit before overhead: $180.00
Gross margin before overhead: 23.1%
Tax is excluded from gross profit. Example amounts only.
Everything for change orders. Nothing you don’t need.
Multiple projects
Each with its own change-order register.
Built-in pricing
Hours × rate + materials + other costs + markup + sales tax.
Print-ready orders
Clean change orders with signature lines.
Approval email
A pre-filled email to send the order to your client.
Status tracking
Draft, sent, approved or declined.
CSV export · JSON backup
Export to spreadsheets; back up and restore your data.
Works offline, no account
A single HTML file. Data is saved in your browser.
English / Español
Switch the interface language anytime.
Your crew speaks Spanish? Your client speaks English? Both work.
The interface switches between English and Spanish with one click, so everyone on the job can use the same tool.
One payment. Unlimited projects.
Delivered as a download. No account, no subscription.
Included
- Multiple projects with change-order register
- Labor × rate + materials + other + markup + tax
- Print-ready change orders with signature lines
- Pre-filled approval email
- Status: draft / sent / approved / declined
- CSV export and JSON backup/restore
- English and Spanish interface
- Works offline; data saved in your browser
Not included
- Cloud sync
- Verified e-signatures
- Payment processing
- Integrations
- Legal or tax advice
- Currencies other than USD
Questions, answered.
Does it work offline?
Yes. It is a single HTML file you open in your browser. No internet connection or account is needed to use it.
Where is my data stored?
In your browser on your own device. Nothing is sent to a server. Use the JSON backup regularly, and to move data to another computer.
Does it work on a phone or Mac?
It runs in a current browser, so it works on Mac and Windows. It is designed for desktop use; on phones it may open, but the experience is not optimized.
Are the signatures legally verified e-signatures?
No. Change orders include printed signature lines for you and your client to sign on paper. There are no verified electronic signatures.
How is sales tax handled?
You enter the sales tax % yourself and it is added to the total. The tool does not give tax advice; check the right rate for your area.
How is it delivered?
As a ZIP download with the single-file app and a quick start guide.
Do I get updates?
To be confirmed.
What is the refund policy?
To be confirmed. The refund policy will be published here before sales open.
Next time they ask for “one more thing,” have the price ready.
US$19 one-time. Offline. English and Spanish.
Buy ChangeMargin Pro · $19