Most people look at one number when they get a repair estimate: the total at the bottom. That's the worst way to evaluate whether a quote is fair.
A legitimate estimate is a document, not a number. If you can't see exactly how the shop arrived at that total, you're flying blind.
What Every Line Item Should Show
Parts
- Part name and description (e.g., "OEM front brake rotor, driver side")
- Part number
- Unit price
- Quantity
- Whether the part is new, remanufactured, or aftermarket — and ideally which brand
Labor
- Operation name (e.g., "Replace front brake rotors and pads, both sides")
- Estimated hours (e.g., 1.5 hrs)
- Labor rate per hour (e.g., $120/hr)
- Subtotal for that labor line
Fees
- Shop supply fee (itemized or flat rate, not a percentage)
- Disposal/environmental fee
- Any diagnostic fee, listed separately from the repair
Totals
- Parts subtotal
- Labor subtotal
- Fees subtotal
- Taxes (parts and/or labor depending on your state)
- Grand total
Red Flags in an Estimate
Watch for these:
- "Miscellaneous parts" with no description — ask what that covers before signing anything
- Labor listed as a flat amount with no hourly rate or hours shown — you can't verify if this is fair
- Parts listed without part numbers — makes it impossible to price-check
- "May require additional work" with no cap or explanation — this is how bills balloon
- No written estimate at all — walk out
"If the estimate isn't specific enough to be wrong, it isn't specific enough."
You Have the Right to Ask
In most states, shops are legally required to provide a written estimate before starting work. They also can't exceed that estimate by more than a set percentage (often 10%) without getting your approval first.
If a shop tells you they don't do written estimates — or hands you something vague with one line and a total — that's not a working style preference. It's a red flag.
Ask specifically: "Can I get this broken out by parts, labor, and fees separately?" A shop that refuses has already told you something useful.
For mobile mechanics, the same standards apply. Anyone doing legitimate work on your vehicle should be able to produce a proper written estimate. The fact that they're working out of a van rather than a bay doesn't change your rights as a customer.
EthicalMechanic.org can help you find shops and mechanics who operate transparently — before you hand over your keys.