How to write a variation quote the customer signs first
Your customer wants a change mid job? Price what is added or removed, refer to the original quote, show the new finish date and get it signed before work starts.
- Six steps for handling any change to the job
- A priced example: rot found under a bathroom floor
- A clause that sets up variations before they happen
By WhizQuote Editorial · 8 minute read
A variation quote is a written price for a change to an accepted job. It names the original quote, describes what is added or removed, prices labor, materials and any credit, states the effect on the finish date, and has a signature line. Get it approved before doing the work, then carry the agreed amount onto the next invoice.
What a variation is
A variation is any change to the agreed scope after the customer accepts your quote. It can add work, remove work or swap one material or method for another. Because the original price covered only the original scope, each variation needs its own price and its own approval, recorded in writing and numbered so it can be traced to the invoice.
Variations come from four places:
- The customer changes their mind: a larger window, a different tile, two extra outlets.
- Hidden conditions: rot under a floor, a cracked drain, rock where the footing goes.
- Design or specification changes from an architect, engineer or inspector.
- Provisional sums and allowances that turn out higher or lower than allowed, such as a fixture allowance of $600 when the chosen fixture costs $840.
Change order vs variation: same idea, different words
A change order and a variation do the same job: they record and price a change to an accepted scope. The difference is mostly regional vocabulary. Variation is the usual word in Australian, New Zealand and British building work; change order is the usual word in the United States and Canada. Contracts may use either, so follow the term in yours.
| Term | Where you usually hear it | Typical number format | Notes |
|---|---|---|---|
| Variation | Australia, New Zealand, United Kingdom, Ireland | V-01, V-02 | Common on residential and trade jobs |
| Variation order | Commercial construction in many countries | VO-001 | Often issued by the client or their consultant |
| Change order | United States, Canada | CO-1, CO-2 | Used on everything from remodels to large builds |
| Extra work order | Some service and maintenance trades | EWO-15 | Usually for small, quick additions |
If you need a ready layout, the change order template works for either name.
Handling a variation in six steps
The process is the same for a $90 extra outlet and a $9,000 extension: stop, write it down, price it, state the time effect, get approval, then bill it. Skipping the approval step is where most money is lost, because a customer who never agreed a price in writing can dispute the amount, or that they asked at all.
- Stop before the extra workWhen a change comes up, pause that part of the job. Work done before the price is agreed is the hardest money to collect.
- Describe the changeWrite what is added, removed or swapped, where, and why, in two or three sentences a stranger could follow.
- Price it line by lineLabor hours at your rate, materials at cost plus your markup, any hire or disposal, less a credit for work no longer needed.
- State the time impactSay how many working days the change adds or saves and the new expected finish date.
- Get written approvalSend it with a variation number and a signature line, and wait for a signature or a written yes before you start.
- Do the work and bill itCarry the approved amount onto the next progress invoice or the final invoice, listed under its variation number.
How to price a variation
Price a variation the same way you priced the original job: labor at your rate, materials at cost plus your usual markup, plus hire, disposal and the time spent organizing it. Then subtract a credit for any original work that is no longer needed, valued at what you charged for it in the original quote.
| Cost | How to price it | Common mistake |
|---|---|---|
| Labor | Hours at the rate in your original quote | Forgetting setup, cleanup and travel for a return visit |
| Materials | Current cost plus your normal markup | Charging at cost, so the extra work earns nothing |
| Hire and disposal | Actual cost plus markup | Missing an extra day of scaffold or a second dumpster |
| Admin and supervision | An hour or two at your rate on bigger changes | Treating the paperwork as free |
| Time on site | Extra days of site costs if the job runs longer | Ignoring knock-on delays to other trades |
| Credits | Removed work at its original quoted price | Crediting at cost, which looks mean, or at full price after materials are already bought |
The guide to materials markup and the markup calculator help keep variation pricing consistent with your original quote.
Worked example: rot under a bathroom floor
A renovator has an accepted quote of $14,600 for a bathroom. When the old floor comes up, two joists and part of the subfloor are rotten. At the same time the customer drops the heated towel rail, priced at $240 in the original quote. One variation covers both, priced at the original labor rate of $78 per hour and a 15% materials markup.
| Line | Working | Amount |
|---|---|---|
| Labor: remove and replace joists and subfloor | 6 hrs × $78 | $468.00 |
| Subfloor sheets | 3 × $64 = $192 at cost | |
| Joist lumber and fixings | $86 at cost | |
| Materials with 15% markup | $278 × 1.15 | $319.70 |
| Extra disposal | Flat charge | $45.00 |
| Admin and inspection with customer | 1 hr × $78 | $78.00 |
| Credit: heated towel rail removed | As priced in the original quote | −$240.00 |
| Variation V-01 total, before tax | $670.70 | |
| Revised contract price | $14,600 + $670.70 | $15,270.70 |
Time impact: one extra working day, finish date moves from 13 to 16 November because of the weekend. Tax is added at the rate on the original quote. The customer signs V-01 before the new joists go in.
What to write on a variation quote
A variation quote needs enough detail to stand on its own if the customer, or anyone else, reads it months later. That means a reference to the original quote, a number for the variation, a plain description, the priced lines, the time effect, the new contract total and a signature line with a date.
- Variation number and date, such as V-01, 6 November 2026
- Original quote number and job address
- Reason: customer request, hidden condition or design change
- Description of the change, in plain words
- Priced lines, credits and the variation total
- Effect on the finish date
- Revised contract total, so the customer sees the running figure
- Approval block: name, signature, date
A ready layout for describing, pricing and signing off a change to an accepted job.
Avoiding variation disputes
Most variation disputes start with a verbal “yes, go ahead” and no price. The fix is a habit: every change gets a number, a price and a signature before the work, and every variation is listed in one place so the running total never surprises anyone. A simple register does this on any job size.
| No. | Date | Description | Amount | Status |
|---|---|---|---|---|
| V-01 | 6 Nov | Joist and subfloor repair, towel rail removed | $670.70 | Signed |
| V-02 | 9 Nov | Upgrade to niche shelf in shower | $310.00 | Sent |
| V-03 | 10 Nov | Extra outlet by vanity | $185.00 | Declined |
- Send the register with each progress invoice.
- Do not let small changes pile up unpriced; five $80 changes are a $400 argument.
- If the customer will not sign, confirm the change by email and ask for a written reply.
Put the variation process in the original quote
The best time to agree how variations work is before the first one happens. A short clause in the original quote sets the rate, the markup and the approval rule, so pricing a change later is arithmetic rather than negotiation. Building work in some countries has its own rules on variations, so check the page for your country.
More clauses are in quote terms and conditions, and the Australian, New Zealand and UK pages cover local building rules we checked.
Variation and change order questions
Can I charge for a variation that was only agreed verbally?
Possibly, but it is much harder to prove the customer asked for it and agreed a price. If you cannot get a signature in time, send an email that same day describing the change and the price, and ask for a written reply before you start.
Should a variation include markup?
Yes. Extra work carries the same overheads and risk as the original job, so price materials at cost plus your usual markup and labor at your normal rate. Charging variations at cost means the busiest part of a job earns you nothing.
Who pays for variations caused by hidden problems?
It depends on your quote. If it excludes hidden conditions or sets a rate for them, the customer normally pays for the extra work as a variation. If the quote is silent, you are in a weaker position. Put a hidden conditions term in every quote for work that opens up walls, floors or ground.
Is a change order the same as a new quote?
It is a priced offer like a quote, but it amends an existing contract instead of creating a separate one. It refers to the original quote number, and the agreed amount is added to, or taken from, the original contract total.
How should variations appear on the final invoice?
List the original contract price, then each approved variation by number and amount, then the revised total, less deposits and progress payments already received. The customer can then trace every dollar back to a signed document.