Job Variation Pricing Calculator
This job variation pricing calculator prices extra or changed work properly. Add up the variation costs, recover your overheads and add a margin, so a change on site does not quietly cost you money.
The extra work
Enter what the variation costs you — the same way you would cost any part of a job. Leave anything that does not apply at 0.
Overhead and profit
The extra work still uses your business overheads, and it should make a margin like the rest of the job.
A practical guide, not tax or accounting advice. Figures exclude VAT.
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Leave an honest Google reviewReviews are optional. Please only review based on your genuine experience.Extra work is not free work
When a job changes on site — more tasks, better materials, a customer request — that extra work has a cost. Priced properly, it protects your profit; absorbed quietly, it eats it.
It is tempting to “just do” a small change to keep the customer happy. But a few unpriced variations across a job can turn a good margin into a break-even.
This calculator prices a variation the same way you would price any work: add up the costs, recover your overheads, and add a fair margin.
A price you can put in writing
Enter the variation costs and the calculator shows the full build-up.
How a variation is priced
A change adding 120 of labour and 80 of materials, with 15% overhead recovery and a 20% margin.
200
30
230
287.50
57.50
Agree it before you do it
The cleanest way to avoid a dispute is to price the variation and get it approved — in writing — before the extra work starts.
Give the customer the figure up front, note that it is a change to the original quote, and only proceed once they have said yes. It keeps the relationship clear and makes invoicing simple.
Build the original quote first
The cost is not the price
The cost of a variation is what it takes you. The price is what it should sell for — after overheads and profit.
Overhead recovery covers the share of your admin, van and running costs the extra work uses. The margin is what you make for taking it on. A variation priced at bare cost quietly gives your profit away.
Check your material markup and margin
Who is this calculator for?
Watch: how to price variations on trade jobs
The "can you just?" trap: small on-site requests that use labour, materials and time but never reach the invoice - and the four steps to confirm, record, price and approve extra work before you do it.
Keep the variation attached to the job
That makes it easier to see what the job really made once the changes are included — one connected record from first enquiry to final payment.
Price the job and every change
Use these alongside your variation pricing.
Is a Quote Legally Binding?
When your quote binds you, and how to change the price once it's accepted.
Read the quotes guide →Video: How To Price Variations
The "can you just?" trap: confirm, record, price and approve extra work before you do it.
Watch the video →Free tools for the job
Put these numbers to work — free FieldHive tools, no sign-up.
Quote & Estimate Builder
Build a professional quote or estimate — line items, VAT and a valid-until date.
re-quote the variation →Job Sheet Generator
Record on-site work and capture a customer sign-off, then export a clean A4 PDF.
record the variation →Quote Profit Margin Calculator
Check the gross profit and margin on a job before you send it.
check the new margin →Job variation pricing questions
Quick answers to the questions people ask most.
Never give away extra work again
Price every variation with overheads and profit, get it approved, and keep it attached to the job with FieldHive.
