The blank "diminished value request form" templates that turn up in search results are not issued by anyone. Filling one in adds nothing an insurer needs and leaves out most of what they do need.
What a request actually is
Three things, sent together, in writing:
- A letter addressed to the insurer handling the claim that already paid for your repair, quoting that claim number.
- A number, with the calculation behind it.
- The documents that support each input to the number.
That is the whole shape of it. The reason no form exists is that the second item cannot be reduced to a box: what your car lost depends on your car, your repair and your market, and an insurer evaluating it needs to see how you got there.
What goes in the letter
Keep it to one page and keep it unemotional:
- Your name, the claim number, the date of loss, the vehicle and the VIN.
- One line stating the other driver was at fault.
- Two or three sentences on what the repairs involved.
- The amount you are asking for, and one sentence on how it was calculated.
- A list of what you have enclosed.
- A date by which you would like a response.
No adjectives, no history of how the accident felt, no threats. The letter is a cover sheet for the evidence.
What to enclose
- The final repair invoice, with every supplement — not the first estimate. It shows what was replaced rather than repaired.
- A pre-accident value you can support, with the working attached.
- Comparable listings, with and without disclosed accident history, screenshotted with the date, mileage and price visible.
- A vehicle history report, showing how and when the accident appears.
- Any written dealer offer you hold. A dealer's own number is the hardest single document to wave away.
Why some insurers appear to have one
Some carriers will send you something to complete once a request is open. That is an internal intake document for their own file, not a claim form in the sense of an official template you are supposed to find and submit. If you are sent one, complete it and still send your letter and evidence: the form collects their fields, not your argument.
Nothing stops you from asking. "Is there a form you would like me to use?" is a reasonable question in your first written contact, and the answer tells you how they route these.
Where to send it
To the claim that already exists. The repair was paid on it and it already has a number, so a diminished value request is an addition to that file rather than a new claim. Use a channel the insurer publishes — the claim portal, the app, or the address on the correspondence you already received. Our insurer pages list what each of the major carriers publishes.
Send it in writing and keep proof of sending. A phone call leaves no record of what you asked for or when.
Questions
Is there an official diminished value claim form?
No. No regulator or insurer publishes one, and there is no industry standard template. The request is a letter with a documented number and supporting evidence attached.
What about the blank forms I can download?
They are not issued by anyone with authority over the claim. They also tend to collect the wrong things — a box for "amount claimed" with nowhere to show the calculation is the part an insurer would ask about first.
How do I submit a diminished value claim?
In writing, to the insurer handling the claim that paid for your repair, quoting that claim number, with your letter and evidence attached. Use a channel they publish and keep proof of what you sent and when.
What is needed for a diminished value claim?
A supportable pre-accident value, the final repair invoice showing what was replaced, market evidence for vehicles like yours with and without an accident on record, and a vehicle history report. A written dealer offer helps more than any of them.
Do I need to use certified mail?
You need proof of delivery, and the method is up to you. What matters is that you can show what you sent and the date you sent it.