Illinois Diminished Value Claims — The Complete Guide.

Illinois's Both-Elements Recovery Framework.

Illinois follows the both-elements framework established in Trailmobile Div. of Pullman, Inc. v. Higgs, 12 Ill. App. 3d 323 (1973). The Illinois Court of Appeals held that "if the property is worth less after it is repaired than its value before the injury, the measure of damages is the difference in the market value before the injury and in its repaired condition in addition to the reasonable cost of repairs." This both-elements framework — repair cost AND residual diminution — gives Illinois claimants the same broad recovery available in Ohio under Rakich.

Illinois pairs this favorable framework with a 5-year statute of limitations under 735 ILCS 5/13-205 (one of the longest in the country, matching Missouri) and UMPD coverage that includes DV. The combination — favorable case law, long SOL, UMPD coverage — makes Illinois one of the most claimant-friendly DV jurisdictions outside Georgia, Washington, and Maryland.

Illinois Authority: Case Law, Statute, UMPD

Illinois DV law combines a clear appellate framework with statutory provisions on limitations, small claims, and UMPD coverage.

Illinois Insurers Use 17c — Trailmobile Doesn't.

Illinois's controlling standard from Trailmobile is market-based and includes BOTH repair cost AND residual diminution. The 17c formula's mechanical 10% cap and severity multipliers don't match this. Major Illinois insurers (State Farm, headquartered in Bloomington; Allstate, headquartered in Northbrook) default to 17c. A demand letter quoting Trailmobile's exact both-elements language puts the claim on solid Illinois appellate footing.

Run 17c first to anticipate the insurer's initial offer, then quantify the gap to Trailmobile's both-elements standard:

Filing a Diminished Value Claim in Illinois.

Illinois's framework is among the most favorable for claimants. Both-elements recovery. 5-year SOL. UMPD coverage. The procedural path is well-developed.

1. Document liability. Illinois's modified comparative negligence (50% bar) is forgiving up to that threshold. Police report, witnesses, dashcam, traffic camera footage establish fault percentage.
2. Determine recovery path. Three options: third-party against at-fault driver's liability insurer (most common), UMPD against your own policy if at-fault driver was uninsured/hit-and-run, or both.
3. Complete repairs. Illinois DV is calculated post-repair. Document repairs comprehensively per the both-elements framework's emphasis on showing both repair cost and residual market loss.
4. Establish pre-accident market value. Illinois-market comparables — Chicago metro (Cook, DuPage, Lake counties), Aurora, Naperville, Rockford, Springfield, Peoria. Chicago's high used-vehicle volume produces excellent comparable data.
5. Document post-repair value. Two written dealer trade-in offers post-repair plus comparable sales of similar Illinois vehicles with accident-history Carfax. Discount typically runs 12-22%.
6. Prepare a USPAP-compliant appraisal. The appraisal cites Trailmobile v. Higgs, references 735 ILCS 5/13-205's 5-year window, and uses Illinois-market comparables. Both repair cost and residual diminution should be documented.
7. Send a demand letter. Quote Trailmobile's both-elements language. Reference 735 ILCS 5/13-205. Send certified mail.
8. Allow 30 days for response. Illinois insurers familiar with Trailmobile typically respond within 14-30 days.
9. File an Illinois Department of Insurance complaint. idoi.illinois.gov handles consumer complaints. IDOI complaints add regulatory pressure.
10. Small claims for $10,000 or less; circuit court above. Illinois small claims (Cook County and elsewhere) handles claims up to $10,000. Attorneys are permitted. Filing fees are modest. Circuit court handles larger claims with full procedure.

Illinois DV Questions