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Your insurance company's first estimate is a starting point. It is not a final number, and it is not always accurate. Most people do not know they can push back, and most people do not have to, because a good body shop does it for them.
Here is how the negotiation actually works, and what you can do if the estimate does not seem right.
Why the first estimate is often lower than what the repair costs
An adjuster looks at your car, usually quickly, and writes down what they can see. The problem is that some damage does not show up until the car is on a lift and panels come off. A bent frame rail, a cracked subframe, a damaged sensor behind the bumper cover. None of that is visible from the outside.
Parts pricing is another source of gaps. Adjusters often price out aftermarket or recycled parts instead of the original manufacturer's parts. Aftermarket parts can be fine for some things. For structural components and safety-related hardware, the fit and the safety standard both matter. You can read about that in OEM vs aftermarket parts in collision repair.
None of this means the adjuster is cutting corners on purpose. Early estimates are written before the car is fully inspected. The real picture comes after the car is torn down and all the damage is visible.
What a supplement is and why it is normal
When a shop finds additional damage during the repair, they file a supplement with your insurance company. A supplement is a written update to the original estimate that documents the new findings and requests approval for the added work.
Supplements are part of almost every collision repair. A shop that never files one is either working on cosmetic-only damage or not looking hard enough. When a supplement is approved, the insurer pays the added cost. Your out-of-pocket stays at your deductible.
At Mashore Autobody we handle supplements directly as part of The Painless Collision Process. We document the damage, write the supplement, and work through the approval with your insurer. You get updates, not phone calls.
The most common points of dispute
Parts type. Adjusters often price out aftermarket parts because they cost less. If you want original manufacturer parts, ask your adjuster what your policy covers and make the request in writing. Your shop can make this case with documentation when the part fit or quality is an issue.
Scope of repairs. If the estimate misses visible damage, your shop photographs it, writes it up, and presents it to the adjuster. Most scope disputes resolve once the documentation is in front of the right person.
Total loss disagreements. If your insurer wants to total the car and you believe it is worth repairing, an independent estimate from a shop you trust shows the real repair cost. One of our customers was rear ended in his 2005 Audi. The insurance tried to total it and undervalue his car. We provided a realistic repair estimate and he kept his car with a clean title. A second opinion is worth getting before you accept any settlement offer.
What you can do if the estimate does not look right
- Get an independent estimate. Bring the car to a shop you trust and let them write their own assessment. A significant gap between that and the insurance estimate is documentation worth using.
- Ask about parts in writing. Request your adjuster to confirm what type of parts are included and whether your policy covers OEM parts.
- Let your shop handle the adjuster. A shop that deals with insurance claims every day knows how to document additional damage and get supplements approved. You do not need to argue on your own behalf.
- Request a reinspection. If visible damage was missed, ask the adjuster to come back with your shop's documentation in hand.
You generally have the right to choose your own shop regardless of what your insurer suggests. We explain that in do I have to use the body shop my insurance recommends.
Understanding how adjusters think
Adjusters look at your car against a set of standard repair procedures and parts prices. They are not always aware of what your specific vehicle model requires or what additional damage may exist underneath the surface. A shop familiar with your vehicle can make that case with documentation. Read more in what insurance adjusters look for in a collision repair estimate.
One thing to clarify before the repair starts
Do not sign a repair authorization if you are unclear about what is and is not approved. If your shop and insurer are still working through a supplement, make sure you understand what is covered before work begins. A good shop walks you through this. If no one explains it, ask before you sign anything.
You can push back on a collision repair estimate. Most of the time you do not have to do it yourself, because a good shop does it for you. The key is working with a shop that knows how claims work and cares about getting the repair right, not just the fastest approval.
If you want an honest look at your damage and someone to handle the insurance from there, bring your car to Mashore Autobody. A free estimate is where it starts. Making collision repair painless is what we do. Call us at 925-516-1930 or stop by our Brentwood shop.
Frequently asked questions
Can I argue with my insurance company about a repair estimate?
Yes. You can push back on a low estimate, request OEM parts if your policy covers them, and ask your shop to file a supplement for additional damage found during the repair. In most cases your body shop handles the negotiation for you.
What is a supplement in auto body repair?
A supplement is a written update to the original insurance estimate that documents additional damage found once the car is on the lift and panels come off. Your shop files it with the insurer, who reviews and approves the added work. Supplements are a normal part of most collision repairs.
What if my insurance company wants to total my car but I want to keep it?
Request an independent estimate from a body shop you trust before accepting a total loss offer. If the repair cost is lower than the insurer's number, that documentation supports keeping the car. Bring it in and we will give you an honest assessment.
Will a supplement cost me more out of pocket?
No. When a supplement is approved, your insurer pays the added cost. Your out-of-pocket stays at your deductible, the same as it would for the original estimate.
Do I have to use my insurance company's preferred body shop?
Generally no. In California you usually have the right to choose your own repair shop. Your insurer can suggest one but cannot require you to use it. Confirm the specifics with your insurer or the California Department of Insurance.
Next step
Call (925) 516-1930 or stop by 44 Sycamore Ave, Suite A in Brentwood. Estimates are free. Read about our how we work with your insurance company, how we work, or get directions and hours. We serve Brentwood, Oakley, Antioch, Discovery Bay and Byron.