An estimate does two jobs. It tells the customer what the repair will cost before you start, and it protects you when the final bill comes up. A vague estimate fails at both: the customer argues about the total, and you have nothing in writing to point to.
What goes on it
- Your shop: name, address, phone, and any license or registration number your state requires.
- The customer: name and phone, plus email if you’ll send it that way.
- The vehicle: year, make, model, VIN and the odometer reading at drop-off.
- The complaint, in the customer’s words: “grinding from the front when braking”, not “brake job”.
- What you found, in plain language the customer can follow.
- Parts, one line each, with quantity and price.
- Labor, with the hours and your rate, or a flat price per job.
- Shop supplies, fees and tax, each shown, not hidden in the total.
- The total, and how long the estimate stays valid.
- Room for the customer’s approval: a signature, or a note of when and how they said yes.
Diagnose before you estimate the repair
Don’t price a repair you haven’t confirmed. If the cause isn’t obvious, sell the diagnosis first: a set fee to find the problem, approved on its own. Then estimate the repair once you know what’s wrong.
This keeps the estimate honest. “Front pads and rotors, $480” is easy to approve. “Could be the pads, could be a caliper, maybe $300 to $900” isn’t, and it invites an argument later.
Parts and labor, line by line
List each part separately. Customers trust an estimate they can read, and line items let them approve part of the work. Pads and rotors now, the tie rod next month.
For labor, show the hours and your rate, or a flat price for the job. Most shops quote from a labor guide’s book time, so the customer pays the same whether the job goes quickly or slowly. If you’re not sure which to use, see flat rate vs hourly billing.
Get approval in writing
Before you start, get the customer’s yes, and keep a record of it: a signature on the estimate, or a dated note of a phone or text approval with the amount they agreed to. If the job grows, stop and get approval for the new amount before you do the extra work. A customer who approved $480 shouldn’t find $700 on the invoice.
Some states have specific rules on written estimates and approvals above a certain amount. Check your state’s consumer protection or automotive repair agency before relying on a verbal yes.
Turn the estimate into the invoice
When the work’s done, the invoice should match the approved estimate, plus anything else the customer approved along the way. If you build the estimate in your shop software, the invoice is the same record with the final numbers, so nothing gets retyped or dropped.