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How to Write an Auto Repair Estimate Customers Approve

What goes on an auto repair estimate, a sample with real math, how to order it by priority, and how to record approval so there's no dispute later.

Ijharul Islam October 11, 2026 8 min read

A good auto repair estimate does two jobs: it tells the customer exactly what they're paying for before you touch the car, and it gives you a record of what they approved. Customers approve estimates they can read, so the format matters as much as the price.

More on this topic: Running an auto repair shop, every guide in one place.

Below: what to include, a sample estimate with worked numbers, how to order lines by priority, and how to record approval. Several states regulate estimates, and we quote California's rules as an example; check your own state's.

The short answer

Write an auto repair estimate as one line per job: a plain description, labor (hours × your rate), parts with quantities and prices, and any fees, then a subtotal, tax where it applies and the total. Group lines as safety now, soon and later, let the customer approve each line, and record who approved, when and how before starting work.

Key takeaways

Each job is its own line with labor, parts and fees, so the customer can approve one and decline another.
Labor is hours × your labor rate; build the hours from your own labor guide or experience and use the same method every time.
Order lines by priority (safety now, soon, later) and say why each one matters in a sentence.
Get authorization before any work and before any added work, and record the date, time, who approved and how.
State rules differ: California, for example, bans a general "shop supplies" charge and keeps sales tax off the estimate. Check your state.

Disclosure: we make BayRobin, an AI receptionist and front office for independent repair shops, and show where it fits. Everything here works without it. Figures from other companies come from their public pages, checked in October 2026 and linked at the end.

What should an auto repair estimate include?

Shop and customer details: your shop name, address and license or registration number if your state issues one; the customer's name and phone.
Vehicle: year, make, model, VIN or plate, and mileage in. Pasting the VIN into a free VIN decoder gives you the year, make, model, trim and engine from NHTSA, so the estimate names the right vehicle.
The customer's concern in their words ("grinding noise when braking").
One line per job with a plain description, labor (hours × rate), parts (quantity, price, and whether new, used or rebuilt) and any fees for that job.
Fees such as hazardous waste disposal, itemized.
Subtotal, tax and total, and how long the estimate is good for.
An authorization block: which lines were approved, by whom, when and how.

Some of this is legally required in some states. California's Bureau of Automotive Repair says an estimate is required before a repair dealer performs repairs, and it must describe the specific job and give the estimated price for all parts and labor, with each part new unless identified as used, rebuilt or reconditioned.

How do you calculate labor on an estimate?

Labor is the hours for the job times your labor rate. Pick a method for the hours (a published labor guide, your own flat-rate menu, or your techs' tracked times) and use it consistently. If your posted rate is $140 an hour and a front brake job takes 1.6 hours, labor is 1.6 × $140 = $224.

For reference, Tekmetric's 2026 survey of posted labor rates puts the national average at $132 an hour, from $100 in West Virginia to $161 in Alaska. Setting your own rate is covered in how to set your auto repair labor rate.

Diagnosis is its own line. If you don't know the fix yet, estimate the diagnostic time, get it approved, then write the repair estimate once you know what's wrong.

What does a sample auto repair estimate look like?

Here's an illustrative estimate for a 2016 midsize sedan at 112,000 miles, using a $140 labor rate and an 8.25% tax on parts. The numbers are an example, not a price guide, and tax rules vary by state (some tax labor, some don't tax repairs at all).

Priority	Job	Labor	Parts	Line total
Safety: now	Replace front brake pads and rotors (pads at 2 mm, rotors scored)	1.6 h × $140 = $224.00	Pads $68.00; 2 rotors at $89.00 = $178.00	$470.00
Soon	Brake fluid exchange (fluid dark, tested high moisture)	0.8 h × $140 = $112.00	Brake fluid $18.00	$130.00
Later	Replace cabin air filter (dirty, photo attached)	0.3 h × $140 = $42.00	Filter $24.00	$66.00
Fee	Hazardous waste disposal (brake fluid)			$6.00
Fee	Shop supplies, where your state allows it			$12.00

If the customer approves everything: jobs $666.00 + fees $18.00 = $684.00 subtotal; tax 8.25% on $288.00 of parts = $23.76; total $707.76. If they approve only the brakes: $470.00 + $6.00 + $12.00 = $488.00, plus $20.30 tax on $246.00 of parts, for $508.30. Show both the full total and the per-line totals so a partial approval is easy.

What California does differently

California is a good example of why you should check your state. Its Bureau of Automotive Repair says the labor rate isn't included on the estimate or invoice, sales tax goes only on the invoice, and charging for items generally noted as shop supplies or miscellaneous parts is prohibited: the customer can be charged only for supplies used on their vehicle, included in the estimate and itemized on the invoice. Hazardous waste disposal charges must be itemized with the shop's EPA identification number. In California you'd drop the shop supplies line and the tax from the estimate above.

How should you prioritize lines on an estimate?

Customers rarely approve everything at once, and they shouldn't have to. Sort the estimate the way they'd decide:

Safety, now: brakes, tires, steering and anything that makes the car unsafe to drive.
Preventing bigger damage, soon: leaks, worn belts, overdue fluids.
Maintenance and comfort, later: filters, wipers, cosmetic items.

Give each line one sentence of why, tied to what the tech found: "Pads at 2 mm; below 3 mm they start to damage the rotors." Inspection photos make this easier, see the digital vehicle inspection guide. When the customer declines a line, keep it on file and follow up; that's covered in declined repairs follow-up.

How do you get and record authorization?

Get approval before any work starts, line by line, and record it on the estimate. California's rules are a useful model even if you're elsewhere:

How approved	What to record (California)
Written	The customer's signature and the date
Oral (phone)	Date, time, name of the person authorizing and the phone number called
Electronic (text or email)	Date, time, name of the person authorizing and the email address or phone number contacted

Two more points from the same rules: a note left with a car dropped off after hours isn't authorization, and if you find more work, you need a revised estimate with the added parts, labor and new total, approved and recorded before you do it.

A phone script for the added-work call:

Hi Dana, it's Marco at Elm Street Auto. While doing the brakes we found the rear pads are at 3 mm too. That's another $295 with parts and labor, so the new total would be about $803 with tax. I've texted you a photo. Would you like us to do the rears today, or leave them for next time?

How do you get more estimates approved?

Send the estimate with the inspection photos, not instead of them.
Make it readable on a phone: short line names, totals visible without zooming.
Let customers approve or decline each line on the same link, and call about anything red.
Follow up on open estimates within a few days; many customers just haven't decided yet.
Price the same job the same way every time with canned jobs, so two service writers don't quote one brake job two ways.

In BayRobin, repair orders are made of labor (hours at your labor rate), parts and fees, built from canned jobs; the customer approves or declines each service on one link, and phone approvals are recorded with your name. Open estimates get follow-up texts on day 2, 5 and 10. BayRobin has no labor guide, so you set your own hours and prices.

Frequently asked questions

Is a written estimate required for auto repair?

In some states, yes. California requires an estimate before a repair dealer performs repairs, with the price for parts and labor and the customer's recorded authorization. Rules differ by state, so check with your state's consumer protection or automotive repair agency.

Can I charge for shop supplies on an estimate?

It depends on your state. California prohibits charging for items generally noted as shop supplies or miscellaneous parts; you can charge only for supplies used on the vehicle, included on the estimate and itemized on the invoice. Elsewhere, if you charge one, show it as its own line.

What if the repair costs more than the estimate?

Stop and get approval before doing the added work. Prepare a revised estimate with the new parts, labor and total, contact the customer, and record who approved, when and how.

Should the labor rate be shown on the estimate?

Many shops show hours and the rate so the math is clear, but rules vary: California says the labor rate isn't included on the estimate or invoice. Showing hours per job helps either way, because customers can see what the labor charge is for.

How long should an auto repair estimate be valid?

There's no single rule; many shops state a period such as 30 days because parts prices change. Put the period on the estimate so it isn't a surprise later.

Where BayRobin fits

BayRobin builds repair orders from canned jobs at your labor rate, lets the customer approve or decline each service on one link, records phone approvals with your name and follows up on open estimates automatically. BayRobin is free until your first 10 booked jobs, no card up front. Start free or see pricing.

Sources

Competitor details in this post were checked against these public pages in October 2026. Products and prices change, so confirm with each vendor before you decide.

#estimates #service writing #customer trust #compliance