A diminished value claim is a letter with evidence attached. There is no special form and no lawyer required for a straightforward one. What defeats most people is the first refusal, which is scripted.
Before you start, three checks
- Was someone else at fault? Diminished value is normally recovered from the at-fault driver's insurer. If you caused it, there is usually nobody to claim from
- Is the accident on the car's record? If no future buyer will ever see it, there may be no loss
- Does your state allow it? Most do for third-party claims. Check your state's position, including the filing deadline
Step 1: gather the evidence
- The police report or claim number
- The full repair invoice, itemised
- Photographs of the damage before repair
- The vehicle history report entry showing the accident
- Comparable local listings for clean equivalents of your car
- Two written dealer trade-in offers, if you can get them
Step 2: work out the number
Do not send a claim without a figure. An open-ended request invites a token offer. See how to calculate diminished value, and expect the adjuster to counter with the 17c formula.
Step 3: write to the at-fault insurer
Address it to the adjuster handling the claim. Keep it short and factual:
- Your claim number, the date and the vehicle
- A single sentence stating you are claiming inherent diminished value
- Your figure, and the one-line method behind it
- A list of what you have enclosed
- A reasonable deadline for a response, commonly 30 days
Send it in a way that creates a record. Email is fine; keep everything.
Check a VIN: you can run any US VIN on CarWorthIt for a free VIN report (specifications, open recalls, safety ratings and running costs), with an optional paid report that prices it against cars actually for sale near you and shows what it cost new.
Step 4: expect the standard refusals
| What they say | What it means | How to answer |
|---|---|---|
| "We do not pay diminished value" | Often a first-line script | Ask them to confirm that refusal in writing, citing the policy or statute it rests on |
| "The repair restored the vehicle" | Conflates condition with market value | The claim is not about repair quality. It is that buyers pay less for a car with an accident on record. Point at your comparables |
| "Our formula gives $X" | The 17c formula, capped at 10% | You are not obliged to accept it. Provide market evidence and ask them to address it directly |
| "You need an appraisal" | Sometimes reasonable, sometimes a delay | On larger claims, get one. On small ones, dealer offers in writing are usually enough |