How do I charge for extra work a customer adds mid-job?
By OwnerKits Editorial · Reviewed before publishing · · 3 min read
Short answer
Stop before you start the extra work, tell the customer the added price and time, and get their approval in writing. Price it from your hourly rate plus materials, and charge for any extra trip. Put it on the invoice as its own line so the original price stays clear.
General information only, not legal, tax or financial advice. Rules differ from place to place, so check with a licensed professional before you act on it. Our sources are listed below.
Why "while you're here" needs a price
Small extras feel too minor to write down, but they are where a fixed-price job loses its margin. Ten minutes becomes forty once you go out to the truck, move furniture and clean up. And if the customer doesn't remember agreeing to a cost, you end up arguing about it at the end of the job with nothing in writing.
Decide ahead of time what you'll do for free. A rule like "anything under 10 minutes with no parts" saves you from making the call on the spot.
A message you can copy
When the request comes up, send something like this and wait for the reply:
Happy to do that. It will take about 45 minutes and needs some parts, so it adds $79 to today's total and we'd finish around 3 instead of 2. Reply YES and I'll add it.
A signed change order is the strongest record. If you can't get a signature on the spot, a text or email where the customer says yes still gives you something in writing. Some states are stricter.
When the law gets involved
New York requires any changes to a covered home improvement contract to be in writing and signed by all parties.
The FTC's Cooling-Off Rule generally doesn't apply to a visit the customer asked for to repair or maintain personal property, but anything you sell beyond that repair can be covered. If it is, the customer can have three days to cancel that part and you owe them the cancellation paperwork. Rules vary, so ask your state's consumer protection office or a local attorney how they apply to your work.
Steps
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Stop and name the change
Before doing anything extra, repeat back what the customer wants. Check your written scope to see whether it is part of the original job or something new.
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Work out the price
Estimate the added time and multiply by your hourly rate. Add materials with your usual markup. If it needs another trip or a parts run, include that too.
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Say how it changes the schedule
Tell the customer when you will now finish and whether it moves anything else.
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Get a written yes before you start
Use a change order the customer signs. If that isn't possible, send a text or email that states the work and the added price, and get a reply.
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Bill it as its own line
Keep the original price on one line and the change on another, and save the approval with the job record.
Worked example
Say you're on a $162.16 fixed-price job when the customer asks you to replace a loose towel bar and patch the old holes. The numbers are examples, based on an hourly rate of $75 and a 25% materials markup. Added time: 0.75 hours × $75 = $56.25 Materials: $18.00 × 1.25 = $22.50 Added trip: none, since you're already there Added price: $78.75, rounded to $79 New total: $162.16 + $79 = $241.16. If the job needs a 30-minute parts run first, add 0.5 × $75 = $37.50, and the added price becomes $116.25. Do the towel bar for free instead and it costs you about $63: 45 minutes at a $60 cost per billable hour, plus $18 in parts.
Common mistakes
- Starting on a spoken yes and trying to bill for it later.
- Giving away small extras with no limit. A few free favors can wipe out the profit on a job.
- Changing the original price on the invoice instead of adding a separate line.
- Forgetting the time impact and running late for your next job.
- Agreeing to work your license or insurance doesn't cover because you're already there.
Everything for handyman businesses
Guides to read next
- How Much to Charge for Handyman Services (2026 Pricing Guide)
What US handymen charge per hour and per job in 2026, how to build your shop rate from your real billable hours, and a worked quote for a 4.5-hour punch list with trip and minimum charges.