Every subbie knows the moment. You are on site, the head contractor points at something and says “just do it, I’ll look after you.” You do the work. Weeks later the invoice goes in, and suddenly nobody remembers agreeing to anything.
Verbal variations are where good money quietly disappears. Not because the work was not real, but because there is nothing to prove it. This guide covers why verbal variations are so risky, and the simple habits that turn a handshake into a claim that actually gets paid.
This is general admin help, not legal or financial advice. Your contract sets its own rules for how variations must be notified and approved, so always check it.
Why “I’ll look after you” is a trap
A verbal agreement can be perfectly genuine and still leave you exposed, for three reasons:
- Memory fades and people move on. The foreman who agreed it leaves the job. The client “does not recall” it that way. Six weeks later it is your word against theirs, and you are the one out of pocket.
- The proof gets buried. The extra drainage you ran is under a metre of fill. The extra framing is behind plasterboard. Once the work is covered, the evidence is gone with it.
- It never makes the claim. Because it was never written down, it does not land on the monthly progress claim, and unbilled work is the easiest kind to forget.
None of that means you should refuse the work. It means you should capture it the moment it is agreed, so the handshake is backed by a record.
Get it in writing where you can
The cleanest protection is simple: get the instruction in writing before you start. That does not need to be a formal document. A text or email that says “confirming you have asked us to add X for $Y, we will proceed” is often enough, and it puts the agreement on the record while it is fresh.
If the client will not put it in writing, you still can. Send a short confirmation yourself: “As agreed on site today, we are proceeding with X at approximately $Y. Let me know if that is not your understanding.” A one-way confirmation that goes unchallenged is far stronger than nothing, and it costs you thirty seconds.
When it has to stay verbal, record it yourself
Sometimes there is no time and no signal and the work just has to happen. That is fine, as long as you make your own record on the day. Capture four things while it is fresh:
- What the extra work was, in one plain line.
- Who approved it, by name, and how (in person, by phone, by text).
- The amount, even a rough estimate you can firm up later.
- A dated photo of the work, taken at the time.
That last one does the heavy lifting. A photo with a date on it is hard to argue with, even months later when the work is buried or built over. No photo, no claim, so make the photo the one habit you never skip.
For more on building this into a system across all your jobs, see our guide on how to track site variations so every one gets billed.
What actually wins a disputed variation
If a client pushes back at claim time, the argument almost always comes down to evidence. The subbie who wins is not the one who argues hardest. It is the one who can show:
- a record made at the time, not reconstructed later,
- who agreed to it and when,
- a dated photo of the actual work, and
- a clear, consistent amount that matches the claim.
Line those up and most disputes end before they start, because there is simply nothing to dispute. That is the whole point of recording variations properly: not paperwork for its own sake, but proof that gets you paid.
Do it in seconds, on site
You are not going to fill in a form on a dusty phone while the client is waiting. That is exactly why we built Variation Tracker:
- 60-second capture. Log the variation before you leave site: a title, the amount, done.
- Photo evidence. Attach a dated photo to every variation, so the proof is locked in the moment the work happens.
- Billing-date reminders. It tracks each client’s monthly billing date and reminds you before the cut-off about every unclaimed variation, so the handshake job you did three weeks ago still makes it onto the claim.
It is built for one-person and small crews, at $29 a month for two users, with a free 30-day trial and no credit card required.
Free download: grab our Variation Register template to start recording verbal variations properly today, even before you try the app.
Frequently asked questions
Is a verbal variation legally binding?
It often can be, but binding and provable are two different things. Even a genuine verbal agreement is hard to enforce if you cannot show what was agreed, by whom, and when. Get it in writing where you can, and where you cannot, make your own dated record on the day.
What do I do if a client refuses to pay for a verbal variation?
Lead with evidence, not argument: your same-day record, the name of who approved it, a dated photo, and a consistent amount. A clear contemporaneous record resolves most of these quickly. For anything serious, check your contract and get professional advice.
How do I prove extra work actually happened?
A dated photo taken at the time is the strongest everyday proof, especially once the work is backfilled or built over. Pair it with a short written note of who approved it and the amount.
Should I stop doing verbal variations?
No, that is not realistic on a busy site. The fix is not to refuse the work, it is to capture it properly the moment it is agreed so you are protected either way.
How do I make sure a verbal variation still gets billed?
Record it on the day, keep it on one list with the client's billing date, and make sure it is on the next progress claim. A reminder before each billing cut-off is what stops "I'll look after you" turning into work you never got paid for.
This guide is general admin help, not legal or financial advice. Whether a verbal variation is enforceable depends on your contract and the law in your state. Check your contract and seek professional advice on any specific claim. Last reviewed August 2026.