How to Calculate and Document Diminished Market Value of a Vehicle After Repairs Following a Car Accident in NJ

The information on this site is for general informational purposes only, may be outdated, and is not legal advice; do not rely on it without consulting your own attorney. See full disclaimer.

Disclaimer: This article is for educational purposes only and does not constitute legal advice. Always consult a qualified attorney about your specific situation.

Detailed Answer

After a car accident in New Jersey, your vehicle can suffer hidden losses in value even after quality repairs. This reduction—called diminished market value—is the difference between your car’s pre-accident value and its post-repair market value. You can pursue this loss from the at-fault driver’s insurer or your own carrier (if your policy covers diminished value).

1. Establish Pre-Accident Value

  • Obtain a market valuation report from sources such as Kelley Blue Book or NADA Guides for your make, model, year, mileage and condition.
  • Gather comparable sales listings within New Jersey.
  • Document the condition with dated photographs prior to repairs if available.

2. Obtain a Professional Post-Repair Appraisal

  • Hire an independent auto appraiser who specializes in diminished value reports.
  • Ensure the appraisal includes a line-item summary of structural and cosmetic repairs.
  • Photograph repaired areas, paint blending and frame alignment.

3. Calculate Diminished Market Value

Use one of these common methods:

  • Direct Comparison: Pre-accident value minus appraised post-repair value.
  • 17c Formula: Multiply pre-accident value by a standard loss-in-value percentage based on the severity of damage (e.g., 0.00–1.00% for minor, up to 10% for major structural damage), then adjust by mileage and market factors.

4. Document Your Claim

  • Collect all repair invoices and parts receipts.
  • Keep a copy of the New Jersey Police Crash Report (N.J.S.A. 39:4-130).
  • Include your appraisal report and comparable sales listings.
  • File your diminished value demand within two years per the New Jersey statute of limitations on property damage claims (N.J.S.A. 2A:14-2).

5. Submit a Demand Letter

  • Address the letter to the at-fault party’s insurer.
  • Summarize the accident, repairs performed and your diminished value calculation.
  • Enclose all supporting documents and request a prompt review.

Helpful Hints

  • Start documenting immediately: take clear, dated “before and after” photos of all damage and repairs.
  • Maintain a detailed repair log: note dates, shops used and parts replaced.
  • Obtain at least two independent appraisal opinions to strengthen your case.
  • Keep all communications in writing: emails, demand letters and insurer responses.
  • Consider consulting an experienced automobile claims attorney if the insurer undervalues your claim.

The information on this site is for general informational purposes only, may be outdated, and is not legal advice; do not rely on it without consulting your own attorney. See full disclaimer.