How Repair Shops Estimate Car Damage
A shop estimates damage by writing down what's broken, what it costs to fix or replace, and how many hours the labor will take.
The estimate is a list of parts and labor, priced out line by line
A repair shop walks around the car, sometimes with a scanning tool for anything electronic, and writes down each damaged part. For each one they decide whether it can be repaired or needs to be replaced, then price it using labor rate guides and parts costs. The total is the sum of those lines, not a single number they guess at.
What changes the estimate is what's underneath the dent, not just what you can see. A bumper cover that looks like a simple scuff might hide a cracked bracket or a damaged sensor behind it. That's why shops often ask to take a panel apart before they'll give a final number, and why the first estimate sometimes grows once they're actually inside the repair.
Whether your insurer sends their own estimate first
If you're going through a claim, your insurer may send an adjuster to write an estimate before you ever get the car to a shop. That estimate is the insurer's number, not the shop's, and the two don't always match. A shop can look at the same damage and find things the adjuster's estimate didn't account for, especially hidden damage behind a bumper or fender.
When the numbers differ, the shop will usually write a supplement, which is a request to the insurer to cover the additional cost once they've opened up the repair and can see what's actually involved. This is normal and it happens on a lot of claims. Ask the shop directly whether they expect to supplement before they start, so you're not surprised later.
If you're paying out of pocket instead of filing a claim, none of this applies. The shop's estimate is the number you're working from, and you can ask for it in writing before they start.
Why two shops can estimate the same car differently
Shops don't all use the same labor rate, and labor rate is set by the shop, not by some industry standard. A shop in a higher cost area or one that does more specialized work may simply charge more per hour for the same job. That alone can make two estimates for the same damage look very different even when both shops agree on what needs fixing.
Shops also differ on parts. Some use original manufacturer parts, some use aftermarket parts, and some use used parts pulled from another vehicle. Original parts usually cost more. If you want to compare two estimates fairly, check whether they're both pricing the same kind of part, not just the same total.
If your insurer is involved, ask them directly whether they require a specific type of part or a shop from their network, since that can also affect which estimate they'll accept.
Questions people ask about this
Why did my repair cost more than the original estimate?
This usually means the shop found additional damage once they opened up the car that wasn't visible during the first walk-around. It's common enough that most shops build a step into their process for writing a supplement once they're further into the repair. Ask the shop to explain what they found and why it added cost before you approve the extra work.
Can I get my own estimate instead of using the insurer's?
Yes, you can usually take your car to a shop of your choice and get their estimate, even if your insurer already sent an adjuster. Whether your insurer will pay the shop's number instead of their own depends on your policy and your insurer, so ask them directly how they handle a difference between their estimate and a shop's estimate.
Do I have to use a shop my insurer recommends?
In most states you are not required to use a specific shop, but your insurer may have a network of shops they work with directly and guarantee the repair on. Using a shop outside that network doesn't usually affect your coverage, but check with your insurer about how it affects the claims process.
What does it mean when a shop declares my car a total loss?
A shop doesn't declare a total loss, your insurer does, based on comparing the repair estimate to the car's value. If the shop's estimate comes in high, they'll usually tell you they expect the insurer to total the car rather than approve the repair. Ask your insurer directly how they calculate the car's value if this comes up.
Should I get more than one estimate before repairing my car?
Getting a second estimate is reasonable, especially if the first one seems high or if you're paying out of pocket. Keep in mind estimates can differ because of labor rates or the type of parts used, not because one shop is wrong. If you're using insurance, ask your insurer whether a second estimate affects your claim before you get one.
See what other drivers in your situation are paying for coverage before you decide anything.
Before you agree to any repair, ask the shop for the estimate in writing, broken down by part and labor, not just a total. If a claim is involved, ask your insurer whether they require a specific shop or type of part, and ask the shop whether they expect to supplement the estimate once they're further into the work. Keep a copy of every version of the estimate you're given, since the first number and the final number are often not the same. If the estimate seems high compared to the car's value, ask your insurer directly how they decide between repairing and totaling the car.
