Most of the money small contractors lose is not lost on site. It is lost between the job and the invoice.
A head contractor says “just do it, I’ll look after you.” You do the extra work. Then the month ends, the progress claim goes in, and the variation is not on it, because nobody wrote it down when it happened. By the time anyone notices, the trench is backfilled and the money is gone.
This guide explains, in plain English, why variations slip through, the one deadline that actually decides whether you get paid, and a simple system to make sure every bit of extra work lands on the claim.
This is general admin help, not legal or financial advice. Your contract sets its own rules for notifying and claiming variations, so always check it.
What counts as a variation
A variation is any work outside your original scope: extra power points the client asked for on site, rock you hit that nobody priced, a design change from the head contractor. If you are doing work you did not quote, that is a variation, and you should be paid for it.
The problem is not doing the work. It is capturing it, with proof, before the window to bill it closes.
Why variations slip through the cracks
The same few things catch subbies out on nearly every job:
- It is agreed verbally. A handshake or a “yeah, just do it” with nothing written down. Later it is your word against theirs — see our guide on getting paid for verbal variations.
- It is not recorded on the day. You mean to log it at the weekend, then three more jobs happen and it is gone.
- There is no proof. Once the wall is closed or the slab is poured, the evidence disappears with it.
- It misses the claim. The work was real, everyone knew about it, but it never made it onto the monthly progress claim, so it never got invoiced.
Every one of those is a recording problem, not a work problem. Fix the recording and you fix the leak.
The deadline that actually matters: your billing date
Forget complicated legal timetables for a moment. For most subbies, the deadline that decides whether a variation gets paid is simple: your client’s monthly billing date, the cut-off for the progress claim.
If the variation is captured and on the claim before that date, you get paid in the normal cycle. If it misses the cut-off, at best it waits a month, and at worst it gets forgotten and eaten. That billing cut-off is the clock you actually need to watch on every job.
Two things worth knowing beyond that: your contract often sets a notice period for variations (sometimes called a time bar), so read the variation and notice clauses before you sign, and some states have separate Security of Payment rules for chasing unpaid claims. Those are worth understanding, but they are the backstop. The everyday habit that keeps you paid is making the monthly cut-off, every time.
The three things that get you paid
You do not need a system that is any more complicated than this:
- Record the variation the day it happens. Not at month-end. On the day. Note the project, what the extra work was, who approved it, and the amount. Sixty seconds now saves thousands later.
- Take a dated photo. A photo taken at the time is proof the work happened, even after it is buried or built over. No photo, no claim, so make the photo automatic.
- Get it on the claim before the billing date. Keep every open variation in one place, know each client’s cut-off, and make sure nothing unclaimed slips past it.
Do those three things consistently and the leak closes.
A simple system you can start today
Start with a register. One list, per job, with a row for every variation: date, project, description, who approved it, approval type, amount, a photo reference, the status, and the client’s billing date. Update it the day work happens, and check it before every claim goes in.
A spreadsheet works right up until you are busy, which is always. That is when entries get missed and cut-offs get blown, so the real trick is making the habit effortless and adding a reminder before each billing date.
Free download: grab our Variation Register template (Excel, Google Sheets, and a printable PDF for the ute) and start recording variations properly today.
Make it automatic
Doing it by hand is better than nothing, but a busy week will still beat a spreadsheet. That is exactly the problem we built Variation Tracker to solve, and it does three things:
- 60-second capture. Log a variation from your phone before you leave site: a title, the amount, done. No more extras forgotten by the weekend.
- Photo evidence. Attach a dated photo to every variation, so you have proof even after the work is covered up.
- Billing-date reminders. It tracks each client’s monthly billing date and reminds you 7, 3 and 1 days out, and again on the day, about every unclaimed variation, so nothing slips off the progress claim.
You add a project once with its billing date, log variations as they happen, and it makes sure each one lands on the claim. It is built for one-person and small crews, not big builders, at $29 a month for two users. There is a free 30-day trial with no credit card required.
Frequently asked questions
What is variation tracking software for subcontractors?
It is a tool for logging variations (change orders) the moment they happen on site, so nothing gets forgotten before it is time to bill. It captures the details, attaches photo proof, and reminds you before each client's monthly billing date so every variation makes it onto the claim.
How do I track extra work on a construction site?
Log it from your phone as soon as it is agreed, before you leave site: a title, the amount, and a dated photo. Keep every entry against the project it belongs to, so you have a running record instead of a memory to rely on, then check it before each progress claim.
How does photo evidence help with progress claims?
A dated photo taken at the time of the work is proof the extra actually happened, even after it is backfilled or built over. It backs up your claim if the client questions it later.
Do verbal variations still count?
Often, in reality, no, unless you can prove them. Without a record it is your word against the client's, and the proof disappears once the work is covered up. Record every variation the same day with a photo and note who approved it and how.
How do I make sure a variation actually gets billed?
Capture it on the day, keep it on one list with the client's billing date, and check that list before every claim. A reminder in the days before each billing cut-off is what turns "I meant to" into "it is on the invoice."
This guide is general admin help, not legal or financial advice. Your contract sets its own requirements for notifying and claiming variations, and payment laws differ by state. Check your contract and seek professional advice on any specific claim. Last reviewed August 2026.