Lyons Township Property Tax Appeal: Deadline & Trends
Lyons Township is being reassessed in 2026, which makes this the year that sets your home's assessed value for the next three years. And the 2025 results offer a useful map: 11.5% of Lyons homeowner appeals won a change, counting each appeal once — but the success rate climbed steadily with home size. Here's the deadline, the trends by home class, and what actually wins a residential appeal in La Grange, Western Springs, and Burr Ridge.
- Lyons is reassessed in 2026. Lyons's Assessor window ran July 23 to September 3, 2026; the appeal deadline is also printed on your notice and posted on the Assessor's Assessment & Appeal Calendar.
- In 2025, Lyons homeowners filed 4,162 appeals at the Assessor, counting each appeal once, and 480 won a change — an 11.5% success rate, or about one in nine.
- The rate rose with home size: condo appeals won just 5.9%, one-story homes 10.6%, and homes over 5,000 sq ft 21.2%.
- When homeowner appeals succeeded, the assessed value fell about 8.5% on average (about $5,600 per winning appeal). Residential appeals are won on comparable homes, recent sales, or factual errors in your record.
Why 2026 matters for Lyons homeowners
Cook County reassesses every property on a three-year triennial cycle. Lyons Township — in the south/west suburban group covering La Grange, Western Springs, Hodgkins, Indian Head Park, and Burr Ridge — is part of the triad being reassessed in 2026. The value the Assessor sets this year becomes the baseline that drives your tax bill until the next reassessment in 2029.
That's what makes a reassessment year the most important time to act. An assessment that's even modestly too high doesn't quietly correct itself — it compounds across three tax years. Catching an error now is worth far more than catching it later.
The notice you receive is not a tax bill. It states the Assessor's estimate of your home's market value and the assessed value derived from it (10% of market value for residential property in Cook County). A higher value doesn't automatically mean a proportionally higher bill — but if your value rose more than comparable homes around you, your share of the local levy can climb, and that's what an appeal addresses.
The Lyons Township appeal deadline
Cook County doesn't use a single county-wide deadline. Each township opens on its own schedule, and the dates shift year to year. The reliable way to find yours is the Assessor's Assessment & Appeal Calendar, which lists when Lyons "opens" and the "last file date" — and in a reassessment year, the deadline is also printed on the last page of your reassessment notice.
- Spring–summer 2026 Your Lyons reassessment notice mails Lyons's Assessor window ran July 23 to September 3, 2026. Your filing deadline is also on the notice itself.
- Several weeks from the mail date Cook County Assessor (CCAO) window The first and fastest path to a correction. File before the last-file date on your notice.
- Open October 8 – November 6, 2026 Cook County Board of Review (BoR) An independent body that opens after the Assessor's window. You can appeal here even if the Assessor denied or only partly reduced you — or if you skipped the Assessor entirely.
- Result Reduction flows to your tax bill Any reduction carries through automatically; you don't re-file to claim it.
The window is short — several weeks (42 to 47 days in 2026) from the notice's mail date, and the date is printed on the notice. Treat the notice arrival as your signal to act, not the deadline. Filing early also means a calmer, better-supported evidence package.
What the 2025 Lyons results show
The clearest read on what happens to a Lyons appeal comes from the 2025 results. Across 4,162 homeowner appeals, counting each appeal once (a condo building's units, decided together, are one appeal), 480 ended in a change — a success rate of 11.5%, or roughly one in nine. But the township-wide number hides a clear pattern: the success rate rose steadily with home size and value.
| Home class | What it is | Appeals | Success rate |
|---|---|---|---|
| 2-99 | Residential condominium | 51 | 5.9% |
| 2-11 | Apartment, 2–6 units | 213 | 8.0% |
| 2-34 | Split-level residence | 536 | 8.2% |
| 2-03 | One-story home, 1,000–1,800 sq ft | 971 | 10.6% |
| 2-78 | Two+ story home, 2,001–3,800 sq ft | 635 | 12.3% |
| 2-06 | Older two+ story, 2,201–4,999 sq ft | 414 | 15.0% |
| 2-09 | Two+ story home, 5,000+ sq ft | 113 | 21.2% |
Two patterns stand out for homeowners. First, larger single-family homes had the highest success rates — the 5,000+ sq ft class won 21.2%, nearly double the homeowner average, and older large homes won 15.0%. Second, condo appeals (Class 2-99) had a strikingly low 5.9% rate (3 of 51), a reminder that filing volume doesn't equal success and that condo appeals need especially strong support.
The likely reason larger homes fare better: they have more assessment complexity and more room for the Assessor's mass-appraisal model to be off, which a good set of comparables can expose. None of this is a guarantee for any single property — but it does show where the evidence has historically been strongest.
How much assessed value actually moved
A change isn't only about whether the appeal succeeded — it's about how much value came off. In Lyons in 2025, winning homeowner appeals cut assessed value by about $5,600 on average, or roughly 8.5%; the typical (median) cut was about $3,330. Across all appeals of every property type, the total assessed value removed was about $19.8 million.
Why it matters: your appeal targets your assessed value, which determines your share of the local tax levy. A lower assessed value doesn't rewrite the entire bill, but it reduces the portion tied to your property — sustained across the full three-year cycle until the next reassessment in 2029.
Most Lyons homeowner appeals (about 88%) ended in no change in 2025. The opportunity is real, but it's earned with evidence — not automatic. A careful look at your comparables before filing is what separates a reduction from a wasted filing.
What actually wins a Lyons appeal
The Assessor and Board of Review reduce residential assessments for specific, evidence-backed reasons. Three carry the most weight:
1. Lack of uniformity (the strongest residential argument)
If comparable homes near you — similar size, age, style, and lot — are assessed for less per square foot than yours, your assessment is "non-uniform" and should be brought in line. In Lyons' established neighborhoods, strong comparables are often available.
2. Overvaluation
If recent sales of similar nearby homes — or a recent purchase or appraisal of your own home — come in below the Assessor's implied market value, you can argue the assessment overstates what your property is worth.
3. Factual error in your property record
The Assessor's description of your home may be wrong: too much square footage, a finished basement that isn't finished, an incorrect bathroom count. Correcting the record can lower the assessment on its own.
| Evidence that wins | Evidence that rarely helps |
|---|---|
| Assessed values of comparable neighbors | "My taxes went up too much" |
| Recent comparable sales below your value | Your personal budget or hardship |
| A recent appraisal or purchase price | The condition of local roads |
| Photos/records correcting a factual error | Comparison to a different township |
How to file your Lyons appeal, step by step
- Find your PIN and read the notice. Your Property Index Number is on the reassessment notice. Note the proposed assessed value and the deadline on the last page.
- Pull your comparables. Identify similar homes near you and compare their assessed values to yours. This is where most of the work — and most of the win — lives.
- Choose your grounds. Usually lack of uniformity, overvaluation, or a factual correction (often a combination).
- File with the Assessor before the last-file date. The CCAO accepts appeals online; attach your comparables and supporting documents.
- If needed, file with the Board of Review when its window opens — a separate, independent second chance.
- Wait for the decision. Any reduction carries through to your tax bill automatically.
Working with us on a Lyons appeal
Appeals are won case by case, on the strength of the comparables. What experience buys you is judgment: which Lyons homes are genuinely over-assessed and which aren't, which comparables the Assessor and Board of Review respond to, and how to package a filing so it isn't dismissed on a technicality.
We charge nothing upfront. We work on contingency — paid a share of the savings only if your appeal actually reduces your bill. If there is no reduction, there is no fee. And if your home isn't over-assessed, the right answer is to tell you so. The whole process, from looking up your PIN to a filed appeal, can usually be completed online in a single sitting.
See if your Lyons home is over-assessed
Enter your address and we'll check your 2026 assessment against comparable Lyons Township homes — free, no obligation, and no upfront cost to file.
Check my assessment →Lyons Township appeal FAQ
When is the Lyons Township appeal deadline in 2026?
Lyons is reassessed in 2026, so the deadline is printed on the last page of your reassessment notice and posted on the Assessor's Assessment & Appeal Calendar. Lyons's 2026 Assessor window ran July 23 to September 3, 2026; the Board of Review's Lyons window is open October 8 to November 6, 2026.
What was the residential appeal success rate in Lyons?
In the 2025 results, 11.5% of Lyons homeowner appeals won a change, counting each appeal once. The rate varied by home class: condo appeals won 5.9%, one-story homes 10.6%, two-story homes 12.3%, older large homes 15.0%, and homes over 5,000 sq ft 21.2%. Past results don't guarantee any individual outcome.
Will appealing make my assessment go up?
Rarely. Across 2021-2025, about 1 in 1,000 decided Cook County appeals ended in a higher assessment; the rest resulted in a reduction or no change. The downside of a well-supported appeal remains small.
How much could a successful appeal reduce my assessment?
In Lyons in 2025, homeowner appeals that succeeded lowered assessed value about 8.5% on average — roughly $5,600 per winning appeal. Your result depends on how over-assessed your specific home is.
Do I need comparable properties to appeal?
They help a lot, especially in a lack-of-uniformity case. The Assessor says comparable properties should share similar characteristics, and staff can review comparables even if you don't submit your own list — but a strong comparable set is the most reliable way to win a residential appeal.
Do I have to pay anything to appeal?
Filing yourself with the county is free. Working with our firm, there's no upfront cost — we work on contingency and are paid only a share of the savings if your appeal succeeds. If there is no reduction, there is no fee.
