You drop the car off with an estimate for $2,400, and a week later, the shop calls and the estimate is $4,100. The first estimate was written from the outside of a closed-up car, while the second was written after somebody took the bumper cover off.
That gap is where most collision repair disputes start, and where owners lose money by signing off on lines they never read. Below, we discuss what the insurer must pay, what it can refuse, and which lines are yours regardless of coverage.
The first estimate is a photo, not a diagnosis
Most initial estimates come from exterior damage: photos you upload, or an adjuster walking around the car with a tablet. Neither method sees behind the panel. A low-speed rear hit that looks like a scuffed bumper cover routinely turns into a bent absorber, a cracked bracket, a deformed rebar, and a dislodged park-assist sensor. On front hits, add the radiator support, condenser, and fan shroud.
None of that shows up until the shop pulls parts off, which is why teardown authorization is the real start of the repair. Be sure to ask for it early; a teardown that adds two days is cheaper than a repair that stalls at week three because the estimate was wrong from the beginning.
Supplements: How the approved number legally goes up
A supplement is an amended estimate the shop submits after finding damage the original missed. The shop documents it with photos and part numbers, sends it to the adjuster, and the adjuster approves or denies it line by line.
Two or three supplements on a moderate hit is normal. However, it’s a warning sign when a shop that orders parts on a supplement that no one approved, and then hands you the difference at pickup. Here are three steps to take:
- Ask for a copy of every supplement and every approval, not a verbal summary
- Confirm in writing which line items the carrier approved and which it denied
- Do not authorize work on denied lines until you know who is paying for them
Parts: OEM, aftermarket, recycled, and “like kind and quality”
This is the largest source of surprise on a repair bill. The Texas Department of Insurance states the position plainly: the insurer “is only required to pay for parts of like kind and quality to those that were damaged. It doesn’t have to pay for original parts from the manufacturer”. Most states work the same way. Unless your policy carries an OEM parts endorsement, the carrier is buying equivalent quality, not brand.
|
Part type |
What it is |
Typical cost vs OEM |
What to watch |
|
OEM |
New, from the vehicle manufacturer |
Baseline |
Paid in full mostly on newer cars or with an OEM endorsement |
|
Aftermarket |
New, from a third-party maker |
20% to 50% less |
Fit on complex panels, and sensor bracket compatibility |
|
Recycled (LKQ) |
Used original part off a salvage vehicle |
30% to 60% less |
Grading, and whether it needs its own repair first |
|
Remanufactured |
Rebuilt original part |
Varies |
Warranty terms, usually shorter than new |
|
Repaired |
Your original part, straightened and refinished |
Labor only |
No new-part warranty, and slower than replacing |
Mitchell’s collision data put repaired parts at 15.5% of parts on an estimate in 2025, up from 14.8% in 2024. OEM part prices rose 4.21% that year against 3.89% for aftermarket, so the spread that justifies an aftermarket decision is not closing.
If you want OEM and the policy pays aftermarket, you can pay the difference. Ask the shop to price both so you are choosing with a number in front of you.
Calibration is the line item nobody expects
If you’ve replaced a windshield, a bumper cover, a mirror, or a grille on a car built in the last eight years, it’s possible you may have moved a camera or a radar sensor. That means calibration, a separate billable operation often sublet to a dealer.
CCC’s Crash Course 2026 report found calibrations on 28.3% of repairable estimates. Mitchell counted estimates carrying calibration lines up 31.4% year over year in 2025.
There are two failure modes. The estimate omits calibration, the shop skips it, and lane-keep assist quietly stops working correctly, or it happens and nobody documents it. Get the pre-scan and post-scan reports into your file.
The parts of the bill that are yours regardless
There are three bill categories that you’ll pay out of pocket:
The deductible: Collision and comprehensive each carry one. Liability does not, because liability does not pay for your car.
Betterment: When a repair replaces a worn item with a new one (tires, a battery, an exhaust section), the carrier pays a prorated share and bills you for the improvement. A tire with 40% of its tread left gets roughly 40% coverage.
All of it, if you carry liability only: Texas minimum limits are 30/60/25: $30,000 per injured person, $60,000 per accident, $25,000 for property damage. Every dollar of that pays somebody else. Without collision and comprehensive, a repair after an at-fault accident is entirely yours. Drivers learn this at the counter more often than at renewal, which is why reviewing your auto policy limits with a licensed agent is worth doing before an accident rather than after one.
You pick the shop, not the insurer
In Texas this is statute, not custom. Insurance Code Section 1952.301 bars an insurer from limiting coverage by specifying the brand, type, kind, age, vendor, supplier, or condition of parts, or by restricting your choice of repair facility. Section 1952.302 adds three prohibitions:
- No referral fees for steering
- No telling a policyholder they must use a specific shop
- No requiring travel far enough to make the choice meaningless
TDI states it directly: “Some companies might give you a list of preferred repair shops, but they can’t require you to use a shop on its list.”
There is a limit worth discussing. The carrier owes the reasonable cost of repair, not whatever your shop charges. If your shop’s posted labor rate runs above what the carrier pays in that market, the shop and the adjuster negotiate, and the gap can land on you. Outside Texas, most states run a version of the same rule through their insurance department, so check yours.
When repair stops being the plan
Totaling the car is now the outcome on close to one claim in four. CCC’s 2026 report put total loss frequency at a record 23.1% of claims. Texas defines the trigger without a percentage. A vehicle is a salvage motor vehicle when repair cost, counting parts and labor but excluding repainting and sales tax, exceeds the actual cash value immediately before the damage. On a 12-year-old car with 180,000 miles, one airbag deployment can clear that bar.
If you disagree with the valuation, your policy almost certainly has an appraisal clause: you hire an appraiser, the carrier hires one, and an umpire settles the difference. It binds both sides, and it applies to your own carrier, not the other driver’s.
The 7-step version
- Photograph the damage before anyone touches the car
- Get the estimate itemized by part type, not as a lump sum
- Authorize a teardown and expect a supplement
- Ask what OEM would cost against what the estimate assumes
- Confirm calibrations and scans are on the estimate
- Ask which lines are betterment and what your deductible is
- Keep every estimate, supplement, approval, and scan report
FAQs
Can my insurer force me to use its preferred shop?
Texas Insurance Code Sections 1952.301 and 1952.302 prohibit it, and TDI confirms a carrier can recommend a list but cannot require it. Most states have a comparable rule.
Does my insurer have to pay for OEM parts?
Not by default; it owes parts of like kind and quality. OEM in full generally requires an OEM parts endorsement, or a vehicle new enough that no equivalent exists.
Why did the estimate go up after the car was already apart?
That is a supplement, the normal result of a teardown finding damage the first estimate could not see. Ask for written approval on each added line.
My car was totaled and I think the value is too low. What now?
Invoke the appraisal clause in your policy. Each side hires an appraiser, an umpire decides, and the result binds both parties.
