New Hampshire Diminished Value Claims — The Complete Guide.

A Recognized Loss, Backed by Precedent.

New Hampshire treats the residual drop in your vehicle's market value after a proper repair as compensable property damage when another driver is at fault, and it has a Supreme Court decision saying so. In Copadis v. Haymond, the court held that the measure of damage to a vehicle is the difference in its value before and after the accident (plus loss of use), or, alternatively, the reasonable cost of repair with an allowance for any remaining difference between the original value and the value after repairs. That allowance for the post-repair value difference is diminished value. Recovery is pursued against the at-fault driver's liability insurer.

So if you were rear-ended in Manchester, Nashua, Concord, Derry, Dover, or Portsmouth and your car was properly repaired, the at-fault driver's insurer owes you the gap between your vehicle's pre-accident market value and its lower post-repair value, and you have three years to pursue it.

Three facts define a New Hampshire DV claim:

1. The right is well-grounded. New Hampshire case law (Copadis v. Haymond) recognizes the post-repair value difference as recoverable, so the existence of the right is rarely the fight, the amount is.

2. The fault rule is forgiving. New Hampshire is modified comparative (RSA 507:7-d): you recover if you were not more than 50% at fault, reduced in proportion to your share.

3. The clock runs three years. New Hampshire's statute of limitations for property damage (and personal injury) is three years (RSA 508:4).

The Rules That Govern New Hampshire DV Claims

New Hampshire's framework is favorable: appellate precedent recognizing the post-repair value difference, a forgiving modified-comparative fault rule, and a three-year window, third-party only, with a practical wrinkle around uninsured drivers. The open question is the amount, which a credible appraisal is built to settle.

Insurers May Quote 17c in New Hampshire — But It Has No Legal Force Here.

The 17c formula originated in Georgia's State Farm v. Mabry settlement and carries no statutory or precedential weight in New Hampshire. A New Hampshire DV claim is measured by the vehicle's actual loss in market value, the before-and-after difference recognized in Copadis v. Haymond, so an insurer that opens with a 17c-based number is offering a negotiating anchor, not applying New Hampshire law.

That cuts in your favor. The 17c formula caps DV at a small fraction of pre-accident value and applies aggressive damage and mileage modifiers, so its output is almost always far below the true market loss a comparable-sales analysis documents. Because New Hampshire recognizes the full post-repair value difference as recoverable, an insurer's 17c offer is simply the floor of the negotiation. Run the number so you know what they are anchoring to, then counter with market evidence of the actual loss.

17c calculator

See what a 17c-based offer looks like, then compare it against the market-based loss your New Hampshire claim can actually document and recover.

Filing a Diminished Value Claim in New Hampshire.

New Hampshire recognizes your right to recover the value your vehicle lost from the at-fault party, with precedent behind it. The process is about confirming an insured at-fault driver, building credible evidence, and pressing a documented demand within the three-year window.

1. Confirm the at-fault driver is insured. Because New Hampshire does not mandate insurance, DV here is third-party, and the state does not allow DV under your own UM coverage, an uninsured at-fault driver can leave you with no insurer to claim against. Verify coverage before investing in the claim.
2. Complete repairs and gather documentation. The crash report, repair invoices, pre- and post-repair photographs, and a Carfax/accident-history record establish both liability and the loss.
3. Establish pre-accident market value (PAMV). Use actual comparable sales from New Hampshire markets, Manchester, Nashua, Concord, Portsmouth. Local comparable sales control; book values are only a starting point.
4. Commission a USPAP-grade valuation report. The credible appraisal sets the number that Copadis's measure calls for. The report must show comparable selection, condition and mileage adjustments, and working calculations, not a single bare figure an adjuster can wave off.
5. Send a written demand with the appraisal attached. Cite New Hampshire's recognition of DV (Copadis v. Haymond), frame the loss as the difference between original value and value after repairs, state your documented number, attach the appraisal, and set a reasonable response deadline.
6. Counter the 17c lowball with market evidence. Expect a 17c-based offer. Do not argue the formula on its own terms, replace it with your comparable-sales analysis, which reflects the actual market loss New Hampshire recognizes.
7. Mind comparative fault. If some fault may be assigned to you, remember New Hampshire lets you recover up to 50% fault (reduced proportionally) and bars recovery above 50%. Build the liability record accordingly.
8. Escalate to the New Hampshire Insurance Department if needed. The Department takes consumer complaints about insurer claims handling. A complaint frequently moves a stalled or unreasonably low claim.
9. Consider small claims for smaller amounts. New Hampshire Circuit Court handles small claims (commonly up to $10,000), a fast, attorney-optional venue for a documented DV claim. Larger claims proceed in superior court.
10. File within three years. The SOL is three years (RSA 508:4). Document early, the comparable-sales evidence is strongest soon after the loss.

Insured Driver, Documented Number.

New Hampshire gives you a recognized right with precedent behind it and a forgiving fault rule, but the recovery path depends on an insured at-fault driver. Three things determine the outcome:

1. Whether the at-fault driver is insured. With no insurance mandate and no UM coverage for DV, an uninsured at-fault driver is the single biggest obstacle, confirm coverage first.

2. The quality of your valuation evidence. New Hampshire measures DV as the post-repair value difference, so a USPAP-grade report with real New Hampshire comparable sales and shown calculations is what beats the 17c anchor.

3. Fault. You recover up to 50% fault (reduced proportionally), barred only above 50%, so a clean liability record protects the full number.

New Hampshire Diminished Value Questions.