Updated August 23, 2026 · The Renovation Room
The south suburbs have been hit by severe storms twice in three weeks — the July 27 storms and the August 11 tornadoes. Cook County’s own officials are telling damaged homeowners to act: “If you want to challenge the [next] tax bill, now is the time,” Board of Review Commissioner Larry Rogers Jr. said at a news conference this week, WBEZ reported August 20. Storm damage that’s substantial enough to affect your home’s value can lower a future tax bill — if you document it correctly, in the right window, through the right office. This guide covers all three, with every fact sourced to the county’s own pages and officials’ public statements.
⏰ First, the honest timing — two things most coverage gets muddled
1. The bill arriving around September 1 cannot be reduced by storm damage. That’s the second installment of your 2025 taxes (mailed ~Sept 1, due Oct 1). Board officials confirmed storm relief isn’t available for it — this year’s damage “could be reflected on 2027 charges if the proper forms and evidence are submitted.”
2. But the timing still favors you: 2026 is the south and west suburbs’ triennial reassessment year. Reassessment notices are mailing right now, and your township’s appeal window opens with them — which makes this exactly the moment to have your damage documented.
General information, not legal or tax advice — The Renovation Room is not affiliated with any county office. Confirm dates with the Assessor or Board of Review before acting.
What qualifies — and what honestly doesn’t
The Cook County Assessor’s standard: a reduction applies only “if the damage is substantial enough to adversely affect the property value.” Their published lists:
| ✓ Can qualify | ✗ Doesn’t qualify |
|---|---|
| Structural damage to foundation or walls · flooring in the living area · central heating & A/C · electrical or plumbing systems · drywall and insulation · mold problems | Personal property (carpeting, furniture, appliances, clothing — not taxed in Illinois) · “normal weather damage such as basement seepage, roof leaks, or loss of gutters” |
Per Commissioner Rogers: “If your property saw significant damage that compromised your ability to live in the property and affected its habitability, you can receive relief on next year’s tax bills if you document that.” He also noted damage is weighed “case by case” — meaning qualifying damage beyond the living space, like a garage, can still be factored in; it doesn’t reinstate the excluded everyday-weather items above.
Build one evidence folder — it works for everything
The Assessor’s own damage-appeal guidelines and Commissioner Rogers’ news-conference list overlap almost completely. One folder covers your insurance claim, an SBA disaster loan, and the tax appeal:
- Interior and exterior photos — taken before cleanup or repair, dated
- Insurance information — claim documents and insurance estimates
- Written repair estimates, bills, and contractor invoices
- Hotel bills if you were displaced, and any evacuation order or occupancy certificate from your village
- Any federal disaster-loan amount approved for the property
- A written description of the damage, with dates
The three doors, in order
1. The Assessor’s damage appeal — during your township’s window
File a Residential Assessed Valuation Appeal with the Assessor while your township is open, attaching the evidence folder above. Filing is online, by mail, or in person. Windows already open on the south side (per the Assessor’s calendar, updated Aug 20):
- Lyons — appeals due September 3
- Bremen — appeals due September 24
- Lemont — appeals due September 29
- Calumet — appeals due October 2
Thornton, Rich, Bloom, Worth, Orland and Proviso: your reassessment notices haven’t mailed yet — your window opens when they do. Watch the Assessor’s calendar, and have the folder ready.
2. Missed the Assessor window? The Board of Review is the second chance
Filing at the BOR is free, staff help with appeals, and homeowners can represent themselves (property held in an LLC requires an attorney). Township windows are rolling, open at least 30 days, and are not set in advance — check cookcountyboardofreview.com for your township’s dates, and check whether the Board’s appeals portal offers pre-registration for your township so your appeal is ready when it opens.
⚠️ The September 1 filing / September 11 evidence deadlines you may have seen in the news belong to seven north-side townships (Evanston, New Trier, Norwood Park, Oak Park, River Forest, Riverside, Rogers Park), per the Board’s own published 2026 schedule — which lists no south-suburban windows yet. Don’t panic about those dates, and don’t wait either: the folder you build now is the appeal you file later. (One exception worth a phone call: the Assessor’s calendar shows a Palos Board of Review window of Aug 3–Sept 1 that the Board’s own schedule doesn’t list — Palos owners should call the BOR at 312-603-5542 before September 1 rather than rely on either date.)
Board of Review Chair George Cardenas, in the same WBEZ report: “We encourage you to follow through. To ensure you get the right assessment.”
3. Substantially damaged in the declared storms? Ask the Assessor about disaster reassessment (PTAX-245)
Illinois law (35 ILCS 200/13-5) has a separate track for property substantially damaged in a disaster: a reassessment prorated from the declaration date, requested on form PTAX-245. The form’s stated condition is that the county has been “declared a major disaster area by the President of the United States or the Governor of the State of Illinois.” Governor Pritzker issued a State Disaster Proclamation on August 18 covering Cook County for the July 27 and August 9–11 and 13–16 storm events — though it doesn’t use that exact statutory phrase, and the county hasn’t yet published guidance applying it to these storms. So make the county the decider: when you file your damage appeal, ask the Assessor’s Office (118 N. Clark St., 3rd Floor, Chicago, IL 60602) whether the August 18 proclamation qualifies and whether to include PTAX-245 with your appeal. No filing deadline is printed on the form.
Rebuilding after severe damage? A separate catastrophic-event provision can exempt up to $75,000 of the rebuilt structure’s added value from your assessment if you rebuild within two years — ask the Assessor about the catastrophic-event home improvement exemption when you file.
One document a contractor can provide
Photos and insurance papers you already have. A written repair estimate appears on the Assessor’s own evidence list (“insurance estimates, repair estimates and/or bills, contractor invoices”) and on Commissioner Rogers’ — and the same document supports your insurance claim and an SBA loan file. To be clear: it’s one of several acceptable evidence types — an insurance adjuster’s estimate, repair bills, or invoices serve the same role, and no contractor estimate is required to file or win an appeal.
If you’d like one, every contractor in The Renovation Room network is a verified member of the RRCA (The Renovation Room Contractors Association), vetted for licensing and insurance. Asking for a written estimate is free, and it isn’t a commitment to hire anyone:
Get a written repair estimate How to pay for storm repairs →
Quick answers
Will this lower the tax bill I’m getting September 1?
No. That bill is the second installment of your 2025 taxes (due October 1) and storm relief can’t reduce it. Damage documented and appealed now can be reflected on your 2027 charges, per Board of Review officials.
My roof leaked and I lost some gutters — do I qualify?
Usually not on its own. The Assessor’s published standard excludes “normal weather damage such as basement seepage, roof leaks, or loss of gutters” — the county is looking for substantial damage that affects the home’s value (structural, living-area flooring, mechanical systems, mold). Document what you have anyway — it supports your insurance claim even when it won’t support a tax appeal.
My township’s window isn’t open yet. Am I stuck?
No — you’re early, which is the good position. Thornton, Rich, Bloom, Worth, Orland and Proviso notices haven’t mailed yet; the window opens when they do. Build the evidence folder now, watch the Assessor’s calendar, and if you miss the Assessor window, the Board of Review is a free second chance later in the cycle.
Do I need a lawyer to appeal?
Not for a home held in your own name — you can represent yourself, filing at the Board of Review is free, and staff help with appeals. Property held in an LLC or other corporate entity must be represented by counsel.
Sources: Cook County Board of Review (2026 session dates & FAQ) · Cook County Assessor’s Office (Floods & Disaster Areas, appeal guidelines, PTAX-245, Assessment & Appeal Calendar as of Aug 20, 2026) · Illinois General Assembly, 35 ILCS 200/13-5 · WBEZ Chicago (Aug 20, 2026 news-conference coverage) · Cook County news releases (Aug 18, 2026 tax-bill schedule; July 30 & Aug 14 disaster proclamations) · Governor Pritzker’s office (Aug 18, 2026 State Disaster Proclamation) · Cook County Treasurer (due dates).
This page is general information for Cook County homeowners, current as of August 23, 2026 — windows, dates and county guidance can change, so confirm with the Assessor or Board of Review before acting. It is not legal or tax advice, and The Renovation Room is not affiliated with any county office.