Article source: Mag Mile Law Trial Attorneys
Property insurers spent the last decade defending weather-driven claim surges. In 2026 they are defending something more structural: a wave of class actions attacking not whether a loss is covered, but how carriers calculate what they owe once coverage is conceded. For litigators watching the plaintiffs’ bar retool, this shift in theory — from coverage denial to systematic underpayment — is the more consequential development.
The mechanics are worth understanding, because they travel across carriers and jurisdictions. Rather than fighting over whether a peril falls within a policy’s grant of coverage, these suits target the adjustment process itself: the depreciation formulas applied to replacement-cost claims, the internal payout guidelines that narrow what a policy appears to promise, and increasingly the algorithms carriers use to flag, sort, and scrutinize claims before a human adjuster ever looks at the file.
From Coverage Fights to Adjustment Fights
The traditional first-party dispute is binary. A homeowner submits a claim, the carrier denies it, and the parties litigate whether the loss was covered. Those cases remain, but they resist class treatment because coverage turns on individualized facts.
The newer theory is built for aggregation. When a plaintiff alleges that an insurer applied a uniform, undisclosed method to reduce payouts across an entire book of business — a depreciation practice not stated in the policy, or a claims-handling rule that contradicts the coverage the policyholder bought — the alleged conduct is common to the class by design. That commonality is what makes certification plausible. Illinois has become a focal point: a proposed class action alleging that a major insurer’s roof-claim guidelines relied on definitions and exclusions absent from customers’ actual policies is one of several theories now being tested. For practitioners tracking how these arguments are being framed at the policyholder level, a detailed breakdown of the class-action claims Illinois homeowners are raising over State Farm’s claim-handling and payout practices lays out the specific allegations now in circulation.
What unites these cases is a move away from the policy’s four corners and toward the carrier’s operational conduct — the memos, the software, the adjuster scripts. That is fertile ground for discovery, and defense counsel should expect it to be the battleground.
The Regulatory Overlay
Class litigation is not developing in a vacuum. Regulators are generating a parallel record that plaintiffs’ lawyers are watching closely.
In Illinois, the Department of Insurance opened a market conduct examination into a large homeowners carrier in late 2024, seeking granular, zip-code-level data on premiums, coverage types, and claims. When the carrier declined to produce the data, the state escalated: the Illinois Attorney General filed suit to compel production of the homeowners insurance data the Department had demanded. The Department has published material from that examination on its own site, and regulatory findings of this kind can supply plaintiffs with a factual scaffold that would otherwise take years of discovery to assemble.
For defense counsel, the interaction between a market conduct exam and pending civil litigation raises real strategic questions — about the discoverability of examination materials, about parallel proceedings, and about the sequencing of settlement discussions. None of those answers is uniform across states, but the pattern of a regulator’s data demand feeding private litigation is one to plan for.
Why Illinois Rewards the Plaintiff’s Theory
Illinois is a useful lens because its statutory framework gives claim-handling conduct teeth. Beyond a straightforward breach-of-contract claim, Illinois law provides an extracontractual remedy where an insurer’s delay or refusal to pay is found to be vexatious and unreasonable. Under Section 155 of the Illinois Insurance Code, a court may award attorney fees and a statutory penalty on top of the amount owed, calculated against a capped formula.
Section 155 does not, by itself, create a freestanding bad-faith tort in Illinois, and courts generally read it as supplementing rather than replacing contract remedies. But it changes the settlement calculus. A carrier evaluating a class claim over systematic underpayment is not only exposed to the aggregated shortfall; it faces a fee-shifting mechanism that can make even modest per-policyholder recoveries worth pursuing at scale. Layer in potential claims under the state’s consumer fraud statute, and the plaintiff’s leverage grows.
Depending on jurisdiction, the availability and scope of these remedies varies considerably, which is precisely why venue and choice-of-law fights matter so much in this category. Statutory interpretation of penalty provisions is rarely settled, and counsel on both sides should treat the fee-and-penalty exposure as a live, fact-dependent question rather than a fixed number.
What This Means for Litigators
Three practical points follow for lawyers on either side.
First, the discovery target has moved. In an adjustment-practices case, the decisive documents are the carrier’s internal estimating guidelines, depreciation schedules, and — increasingly — the training data and decision logic behind automated claims tools. Defense teams should audit that material early; plaintiffs will ask for it.
Second, certification will be won or lost on uniformity. Plaintiffs need to show a common practice applied across the class; defendants will emphasize the individualized judgment that adjusters exercise on each file. The record built during a regulatory examination can cut hard in the plaintiff’s favor on that question.
Third, the exposure is asymmetric in fee-shifting states. Where a statute like Illinois’s Section 155 applies, the downside for a carrier that misjudges the reasonableness of its conduct extends well past the underlying payout.
The through-line is that property insurance litigation is becoming a fight about process, not just about perils. Carriers that treated claims-handling methodology as an internal operational matter are finding that methodology dragged into open court — and, in states that penalize unreasonable delay, doing so carries a price that ordinary contract damages never captured. For litigators, the class action built on adjustment conduct is likely to define first-party insurance disputes for the next several years.
