Tygart Media · Auto Claims Guides · Diminished value
What the letter has to do
The letter has five jobs, and a good sample does all five in about a page:
- Identify the claim. Your name, the claim number, the date of the accident, and the car. The adjuster should be able to match the letter to the right file in seconds.
- State a specific demand. One clear amount, stated as your diminished value claim. A letter that says the car is worth less now, without naming what you are asking for, gives the adjuster nothing concrete to approve or negotiate.
- Attach the evidence. The appraisal or other value evidence, the final repair invoice, and the history report belong with the letter, not described inside it. The letter points to the attachments; the attachments carry the proof.
- Set a response expectation. Ask for a written response and say when you expect to hear back. Keep the wording polite and plain — you are setting a record that you asked and when, not making a threat.
- Create a paper record. Sent in writing and kept, the letter proves what you demanded, what you sent with it, and when. Phone calls do not create that record; this letter does.
Where the letter goes
For a diminished value claim after another driver’s accident, the letter normally goes to that driver’s insurer — a third-party claim against the at-fault driver’s policy. Which insurer pays is covered in Who pays diminished value — my insurer or theirs? Use the claim number that insurer assigned, and address the letter to the adjuster handling the file.
Attach the appraisal and the key evidence rather than describing them at length. A letter that says an appraisal exists invites a request for it and a delay; a letter with it attached can be evaluated on the first read.
The sample letter
This is an example to adapt to your facts, not a form issued by any insurer or court.
[Your street address]
[Your city, state, and ZIP code]
[Your email address]
[Your phone number]
[Claims department or adjuster name]
[Insurer street address]
[Insurer city, state, and ZIP code]
Claim number: [claim number]
Date of accident: [date of accident]
Vehicle: [vehicle year/make/model]
Insured driver: [name of the at-fault driver, if known]
[Your signature]
[Your full name]
Read the finished letter once as the adjuster will. The claim number is on it, the amount is stated plainly, and the attachments are listed. If your appraisal words the value loss differently, copy its figure exactly — the letter and its main attachment should agree.
Get The Signal
What we actually ran, what it measured, and what it means for a restoration shop — every week, including the flops.
How to send it, and what to keep
- Send it in a way that proves delivery. Email with a delivery or read confirmation you can save, or tracked mail with a receipt, both work. What matters is that you can later prove the letter was sent and received, and on what date.
- Attach, do not just mention. Include the appraisal, the final itemized repair invoice, and the vehicle-history report as actual attachments or enclosures, and list them at the end of the letter.
- Keep a complete copy. Save the exact letter you sent, the attachments as sent, and the delivery proof together in your claim folder. That set is your record if the claim is disputed, transferred to a new adjuster, or escalated later.
After you send it
The most common response is a counteroffer lower than your demand, often built on a standard formula the insurer uses instead of your appraisal. How those calculations work is covered in How is diminished value calculated? A low first answer is a negotiating position, not a final verdict. Reply in writing, point to the specific evidence the response leaves out, and keep every exchange in the same folder as the letter.
If the insurer refuses outright or stops responding, the next steps are escalation — the routes laid out in Disputes. Your letter and its delivery proof are the foundation for any of those steps.
Frequently asked questions
Who do I send a diminished value claim letter to?
For a third-party claim, send it to the insurer for the driver who was at fault, using the claim number that insurer assigned. If liability is still being decided, send it to the insurer handling the property damage claim and keep proof of delivery.
Should I attach my appraisal to the letter?
Yes. Attach the appraisal and the key evidence instead of only describing them in the letter. The letter states the demand and the attachments give the adjuster the documents needed to evaluate it.
What happens after I send the letter?
Expect a response that may be lower than your demand, often explained with a formula or a standard calculation. Read the reasoning, compare it with your evidence, and reply in writing if the response leaves out repairs or market facts your file documents.
Can signing a release hurt my diminished value claim?
Yes, it can. A general release signed with a repair payment can end related claims, including diminished value, even if you meant to accept only the repair money. Read any release carefully and do not sign it until the diminished value demand is resolved or the release clearly leaves that claim open.
A diminished value demand letter, at a glance
| Part of the letter | What it does |
|---|---|
| Claim identification | Matches the letter to the right claim, accident, and car |
| The specific amount demanded | Gives the adjuster a concrete figure to evaluate |
| Attached appraisal and evidence | Carries the proof, so the letter stays short |
| A written response request | Sets the expectation and keeps the reply on the record |
| Proof of delivery and your kept copy | Proves what was sent, what was in it, and when |
Get The Signal
What we actually ran, what it measured, and what it means for a restoration shop — every week, including the flops.
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