How a diminished value claim works, start to finish

The five stages

1. The repair closes. The insurer pays the shop, the claim stays open on their system, and the accident begins appearing on vehicle history reports. Nothing about diminished value has happened yet.
2. You build the file. Final repair invoice, a supportable pre-accident value, comparable listings with and without accident history, the history report. This is the stage that decides the outcome, and it is entirely in your hands.
3. You send the request. A letter to the existing claim, quoting its number, with the figure and the evidence attached.
4. They respond. Usually a formula-based counter-offer, sometimes a request for more, sometimes silence.
5. You answer the response, or you escalate. Each of those answers has a different reply, which is the part most guides skip.

Who you are claiming from, and why it matters

This is normally a third-party claim — against the insurer of the driver who caused the crash. You are not their customer, which cuts both ways: you have no policy obligations to them, and they have no contractual relationship with you either.

A first-party claim, under your own policy, is a different question and in most states the answer is no: standard policies promise to repair or replace, not to make up a market difference. Your state page gives the position where your accident happened.

If you were at fault, there is generally nobody to claim from. If the car was a total loss, it was not repaired, so the argument is about actual cash value instead.

What happens on their side

The request lands with the person handling the property damage file. In most cases the response is produced by running a short formula — commonly 17c: ten percent of the pre-accident value as a ceiling, cut by a damage multiplier, then cut again by a mileage multiplier. It takes minutes and it does not look at your market.

That is why a formula answer is not really a rejection of your evidence. It is usually a number produced without reading it. See what that formula pays on your car, and the comparison is the argument.

How long it takes

There is no reliable published average, and we will not invent one. What is predictable is the shape: insurers are not quick on these, expect weeks rather than days, and expect at least one round of back-and-forth before anything is resolved.

Two timing facts are worth holding on to:

• Your state's filing period runs from the accident date, not from when the repair finished or when you first wrote. It does not pause while a claim is open. Check yours.
• Evidence decays. Listings come down as vehicles sell, repair photographs become impossible once the panels are back on, and the person handling your file may be reassigned. Early is cheaper than late.

Where claims stall

Three places, in order of how often they happen:

• No number. "My car is worth less now" is a belief. Nothing can be evaluated against it, so the path of least resistance is a formula or a decline.
• No market evidence. A number with a method but no listings is an assertion about a market nobody has been shown.
• No follow-up. Silence costs the insurer nothing until it costs them something. Two or three written follow-ups, roughly two weeks apart, are normal before escalating.

If it does not resolve

In order, and be clear about what each one can do: a follow-up to the adjuster's supervisor; a complaint to your state's insurance regulator, which addresses how the claim was handled and not what your car is worth, and does not pause your deadline; then small claims court, which is the forum that can actually decide the value question. What to do if your claim is denied covers the five answers and what each one calls for.