After the dispute starts
The work is done and they are disputing it. Here is what actually gets you paid.
Almost every piece of advice about extra work assumes you have not done it yet. That is useless at 9pm on invoice day, when the customer has just replied 'I never agreed to that' about work that is already in their house. The question now is not how you should have handled it. It is what evidence you already have, how to present it without starting a fight, and how much this is worth chasing.
Direct answer
Do not argue the memory. Assemble the written trail first - the request, your price, and their reply - then send one calm message that shows the record instead of debating it. Most customers back down when they see their own words with a date on them. Decide your walk-away number before you send anything.
01Workflow
What to do in the first 24 hours
- 1
Do not reply while you are angry. Nothing you send in the first hour will help.
- 2
Collect the entire exchange, not just their approval - the message where you stated the price matters more than their 'go ahead.'
- 3
Screenshot or export it with dates visible, and put it somewhere you can find in thirty seconds.
- 4
Send one message that presents the record plainly and offers a way to settle without anyone admitting fault.
- 5
Decide in advance what you will accept, and what number is not worth your time to chase.
02Practical notes
What matters in the field.
A 'go ahead' on its own is weak evidence.
A screenshot of the customer saying 'yes' proves they agreed to something. It does not prove what. If the message containing the scope and the price is not in the same picture, you are back to competing memories. Capture the whole thread, or at minimum the price message and the approval together.
Most disputes are memory, not fraud.
Contractors describe the same pattern over and over: the customer genuinely does not remember agreeing, because the conversation happened in a hallway three weeks ago while they were thinking about something else. Leading with 'you agreed' triggers defensiveness. Leading with the dated record lets them update their own memory without losing face.
The ones who get paid are the ones who can produce it fast.
One contractor keeps a folder on his phone labeled 'I told you so' - nothing but screenshots of approvals. He has used it twice, and both times the customer went quiet as soon as he pulled it up. The evidence only works if you can find it while the conversation is still happening.
Know what the fight is worth before you start it.
Chasing $180 through three weeks of hostile texts costs more than $180. Many experienced contractors set a threshold in advance: below it, take the loss, tighten the front end, and move on. Above it, escalate deliberately - a formal demand letter, a lien if your state allows one for the work type, or small claims. What loses money is the middle ground where you neither collect nor let go.
Even when you lose the money, extract the lesson.
One contractor described getting written up over a fire alarm change order that never got signed - everyone involved knew the work was needed, the general contractor was pushing to finish, and it still became a serious problem because the paper was missing. Whatever happens with this invoice, the fix is the same: the approval has to exist before the work does.
03Checklist
Before you send the dispute message
The message where you stated the scope and price, with the date visible
Their reply approving it, in the same screenshot if possible
Photos from before and after the added work
Your original quote showing the work was outside it
A specific number you are asking for, not a general complaint
A settlement option you would genuinely accept
Example
The message to send
Hi [name] - I want to clear this up quickly. On [date] I sent you the added work and the price, and you replied to go ahead. Here is that exchange.
I know a lot has happened since then and it is easy for this to get lost. The amount in question is $180 for [work].
If it helps, I am happy to split it across the two remaining payments. Let me know what works and we can close this out.
04FAQ
Common questions.
What if I have nothing in writing at all?
Then you are negotiating, not proving. Be honest about that with yourself. Photos of the work, the original quote showing it was out of scope, and a reasonable partial offer are your tools. Many contractors settle for half in this situation and change their process the same week, because the alternative is spending days on a case they cannot win.
Should I threaten a lien or small claims?
Not in the first message. Threats end the cooperative path immediately and are hard to walk back. If you do escalate later, know the actual rules first - lien rights, deadlines, and what qualifies vary by state and by the type of work, and getting the procedure wrong can void your claim. This is a point to check with a local attorney rather than guess.
They approved by text but now say the price was different.
This is exactly why the price message matters more than the approval message. If your text stated a specific figure and their reply followed it, show both together in one image. If you never named a figure before starting, that is the gap - and it is the single thing to fix for next time.
See what the approval record looks like.
Open the sample PDF first, then download SiteTicket AI if this is close to how you handle added work, customer approval, and invoice backup.
Related guides
Change order with signature: what to capture before extra work starts.
When a contractor needs a signed change order, what to include, when to collect the signature, and how to keep a clean approval record.
Extra work approval text: wording to send before continuing.
Copy-ready wording contractors can send when a customer asks for extra work while the job is already underway.
Contractor change order template for small extra work.
A practical contractor change order template for extra work, added cost, customer approval, and invoice handoff.