Can you recover diminished value in New Hampshire?
Yes. A New Hampshire owner can present a third-party claim for vehicle value that remains lost after repair, but the owner must document the loss. The state's leading automobile-damages case permits reasonable repair cost with an allowance for the difference between original value and value after repairs, plus loss of use. It does not promise a payment whenever an accident appears on a history report.
Start with the correct New Hampshire claim path
New Hampshire diminished value claim paths| Claim path | Starting position | What controls |
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| At-fault driver | Present a documented residual-loss claim after repair. | Copadis, fault, repair evidence, before-and-after values, causation, and limits. |
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| Own policy | The Insurance Department says diminished value is not covered. | The complete policy, physical-damage coverage, exclusions, appraisal, and other endorsements. |
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| Government vehicle | State agencies and political subdivisions use different notice and forum rules. | Entity identity, 180- or 60-day notice path, immunity, forum, and filing period. |
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Copadis allows repair cost plus proved residual loss
In Copadis v. Haymond, 94 N.H. 103, 47 A.2d 120 (1946), the New Hampshire Supreme Court approved the Restatement measure for harm to a vehicle that was not totally destroyed: the owner may use the difference between value before and after the harm or reasonable repair cost, when feasible, with due allowance for any difference between original value and value after repairs, plus loss of use. The repairs in Copadis did not restore the car to its former condition, and a qualified vehicle-market witness supplied value evidence.
Couture v. Marquis, 107 N.H. 47 (1966) later described Copadis as New Hampshire's property-damage rule and held that paid repair cost can be competent damage evidence. Together, the cases support a proof-based measure, not a fixed age limit, repair threshold, accident-history percentage, or automatic recovery.
The Insurance Department separates first- and third-party claims
The New Hampshire Insurance Department's current Automobile Insurance Consumer's Guide directly addresses diminished value. It says diminished value is not covered under the owner's own policy because it is not physical damage to the auto. When claiming against another driver's insurance, the owner may present diminished value, but bears the burden of documenting the loss.
Do not treat ordinary collision coverage, an uninsured-driver situation, and a third-party liability claim as interchangeable. Read the policy, endorsements, definitions, exclusions, deductible, appraisal language, and duties after loss. Copadis defines tort damages; it does not rewrite an insurance contract.
Formula 17c is not New Hampshire's legal measure
No New Hampshire authority cited here requires Formula 17c, a 10% cap, or generic mileage and severity multipliers. The Formula 17c guide can provide a rough worksheet, but Copadis and the Insurance Department require loss-specific support. A useful valuation identifies its source data, dates, geography, transaction level, comparable selection, adjustments, repair history, prior damage, mileage, equipment, and title status.
The ordinary filing period is generally three years
RSA 508:4 generally requires personal actions to be brought within three years of the complained-of act or omission, subject to its discovery language. Do not assume that repairs, valuation work, negotiations, a regulator complaint, or a delayed denial restarts or pauses the period. Contract claims, releases, estates, government defendants, and unusual accrual facts can follow different rules.
A claimant at 50% fault may recover a reduced amount
Under RSA 507:7-d, claimant fault does not bar a property-damage recovery when it is not greater than the defendant's fault, or the defendants' combined fault when recovery is allowed against more than one. Recoverable damages are reduced by the claimant's percentage. Preserve crash photos, video, witness information, reports, citations, vehicle data, and written liability decisions.
Government claims have early notice traps
A claim involving a New Hampshire state agency can fall under RSA Chapter 541-B. RSA 541-B:14 generally requires the claim within three years and written notice to the agency within 180 days. RSA 541-B:11 says the claimant first files with the agency; the Board of Claims and Superior Court roles then depend in part on the amount and statutory jurisdiction.
A town, city, county, school district, or other political subdivision follows a different route. RSA 507-B:7 generally requires the action within three years and registered-mail notice to the governmental unit's clerk within 60 days. The statute addresses prejudice from missing notice, but relying on that exception is risky. Identify the vehicle owner and employing agency immediately.
Use the New Hampshire market that would buy the vehicle
Manchester, Nashua, and the Interstate 93 and Route 3 corridors can overlap the northern Massachusetts buyer market. Concord and central New Hampshire may support a separate set. Portsmouth, Dover, Rochester, and the Seacoast can reasonably reach into southern Maine when the buyer market does. Laconia and the Lakes Region, Lebanon and the Upper Valley, Keene and the Monadnock Region, and Berlin, Littleton, and the North Country may need wider radii. Explain every distant or cross-border comparable instead of mixing markets silently.
Match model year, trim, drivetrain, mileage, equipment, condition, title status, prior use, and earlier damage. Dealer asking prices, documented sales, trade bids, auctions, and private-party listings answer different questions. Peer-reviewed used-car market research supports only the limited point that credible vehicle information can affect pricing behavior; it does not establish New Hampshire liability or a diminished-value percentage.
Repair, total-loss, and title rules answer different questions
New Hampshire's official Ins 1002 claim-settlement rules say an insurer may not require a particular repair facility. A repair offer must represent a fair and reasonable area price and include the required willing-shop and choice disclosures. Aftermarket parts must be at least equal in like kind and quality for fit, quality, and performance, and connected hidden damage must be addressed in a negotiated repair settlement.
The New Hampshire Supreme Court's Keene Auto Body v. State Farm opinion addresses a repair-price and post-loss assignment dispute, not diminished value. It confirms that the repair rules form a framework for disagreements over fair and reasonable repair cost. Keep that issue separate from the market loss allegedly remaining after the completed repair.
For a total loss, Ins 1002.15 requires a fair-market-value method and a valuation report. It uses local sales or quotations with defined alternatives and gives a claimant a limited 20-day route to present two reliable sources for recalculation in qualifying cases. RSA 261:22 separately defines total loss and salvage-title treatment. Its 75% repair-cost rule applies to damage during the vehicle's model year or the next four calendar years; the statute also covers vehicles that are physically or economically impractical to repair. It is not a universal 75% settlement formula for every car.
The DMV's Salvage Repair and Title Program requires a salvage inspection before a qualifying vehicle can receive a New Hampshire rebuilt title. A branded salvage or rebuilt vehicle is not the same valuation problem as a repaired clean-title vehicle.
Evidence to collect before making the demand
- ownership, VIN, loss date, claim number, crash report, fault proof, and damage photographs;
- final repair invoice, supplements, parts list, scans, measurements, calibrations, and warranties;
- a post-repair inspection identifying any remaining condition, function, fit, finish, or warranty issue;
- pre-loss mileage, condition, options, title status, service history, prior use, and earlier incidents;
- before-and-after values using consistent dates, geography, condition, and transaction level;
- comparable sales or listings, dealer bids, or an appraisal with sources and adjustments explained; and
- insurer estimates, valuation worksheets, payments, policy language, denial reasons, and proposed release.
How to submit a New Hampshire diminished-value demand
- Identify the vehicle owner, responsible driver, insurer, claim path, limits, and fault evidence.
- Calendar the ordinary three-year date and immediately screen for a 60- or 180-day government notice.
- Complete safe repairs and document their scope, quality, and any remaining difference.
- Use the diminished value calculator as a starting estimate, then replace generic assumptions with Copadis-specific market proof.
- Send a dated demand stating the amount, valuation dates, methodology, prior payments, and exhibits. Adapt the claim letter template.
- Ask for the insurer's valuation, assumptions, claim authority, and denial reasons in writing.
- Read every property-damage release before accepting payment because it may resolve more than one issue.
Insurance complaints and New Hampshire Small Claims
The Insurance Department's consumer complaint form and instructions explain its assistance and formal complaint process. First send the insurer a focused written request and supporting evidence. The Department enforces insurance law, but its guide warns that it cannot always obtain the remedy a consumer wants. A complaint does not file a lawsuit or pause a deadline.
RSA 503:1 currently defines a small claim as a money claim not exceeding $10,000, excluding interest and costs. Claims over $5,000 require mediation if neither party requests a jury transfer, and a defendant may request a jury when the claim exceeds $1,500. Review venue, parties, service, proof, transfer rights, and the effect of reducing a larger claim before filing.
Related state guides
Cross-border crashes and buyer markets can involve different rules. Compare the Maine guide, Massachusetts guide, and Vermont guide, but do not assume a neighboring state's law controls a New Hampshire loss.
Source and scope note: Reviewed July 28, 2026. This guide uses current New Hampshire court, legislature, Insurance Department, DMV, Board of Claims, and Judicial Branch materials, plus the cited used-car research. Copadis is a tort-damages decision; it is not a guarantee of payment or a holding that an owner's policy covers diminished value. Results depend on repair and market proof, fault, causation, policy language, limits, releases, ownership, title history, and deadlines. This page provides general information, not legal, insurance, repair, or appraisal advice.