Cook County property tax
Lemont Township property tax appeal guide
Your township: Lemont
Cook County Assessor
Window closed September 29, 2026 Official Cook County Assessor source ↗
Board of Review
Deadline: December 8, 2026 · 29 days remaining Official Board of Review source ↗
Lemont Township: the Board of Review is accepting appeals through December 8, 2026.
File with the Cook County Board of Review · $0 filing fee ↗Latest published calendar source date: November 6, 2026.
When were the calendar records checked?
- Cook County Assessor: last retrieved .
- Board of Review: last retrieved .
These are separate source retrievals, not editorial reviews or a guarantee that filing is open. A published source date can be older than its retrieval date. Missing dates do not mean there is no deadline.
Lemont Township extends beyond the village that shares its name, making the township designation the relevant one for the assessment calendar rather than the municipality used in a mailing address. It was reassessed for 2026 as part of the South Triad and is next scheduled for 2029. The Board of Review nevertheless opens a township window every year.
Cities and villages in Lemont Township
Property addresses in Lemont Township most often list these cities:
- Lemont — 7,419 single-family parcels (100% of this township's single-family parcels)
A city can span more than one township, so confirm your township on your assessment notice or the Cook County Assessor's site.
Recent home sales in Lemont Township
From August 11, 2024 through August 11, 2026, the comparison pool contains 482 recorded single-family sales.
- Median sale price: $600,000
- Middle-half sale price range (25th–75th percentile): $445,000–$734,774
- Median sale price per square foot: $263
- Median building size: 2,195 square feet
- Median year built: 1996
These are recorded single-family sales used as comparison evidence, not an estimate of any home's value.
Evidence to review
- Reconcile the Assessor's separate land and building measurements with the available property records before selecting sales.
- Compare houses from a similar era and construction type, especially when newer homes or major rebuilds appear in the same search area.
- Account for lot shape, frontage, and site access when two parcels have similar recorded land area but function differently.
- Use date-stamped photographs and a concise condition log to distinguish longstanding defects from work completed after the relevant appeal year.
To check property facts on the county map, follow our CookViewer property comparison walkthrough. Keep assessment values separate from recorded sale prices.
Official sources
Cook County Assessor calendar · Cook County Board of Review appeals
You file directly with Cook County for free. We provide optional research, not representation or guaranteed savings.
Other South Triad townships
Related guides
- Cook County property tax appeal evidence checklist — Organize records, sales comparisons, photos, and submission confirmations with a printable preparation checklist.
- How much could a Cook County property tax appeal save? — Work through an illustrative tax calculation and understand why an assessment reduction is different from a tax saving.
- Wrong square footage on your Cook County assessment? — Verify property measurements, document a record error, and prepare a correction request with an evidence checklist.
- Why are my neighbor’s property taxes lower in Cook County? — Separate assessments from exemptions, compare similar homes, and work through a neighbor comparison before appealing.
- Cook County property tax appeal after buying a home — Assessment higher than your purchase price? Compare the figures, gather closing documents, and check your appeal window.
- How to use CookViewer to compare Cook County properties — Find the official map, compare property facts, and keep assessment figures separate from recorded sale prices.
- Why did my Cook County property tax bill go up? — Work through annual totals, assessment changes, exemptions, and tax rates before choosing your next step.
- How to read your Cook County assessment notice — Understand the numbers, verify your property facts, and turn your notice into an evidence checklist.
- Missed your Cook County property tax appeal deadline? — Find out which window closed, check the other appeal office, and prepare for what comes next.
- Assessor appeal vs Board of Review appeal — Understand the two appeal offices, their separate calendars, and the evidence each reviews.
- How to find comparable sales — Review a hypothetical sales comparison and print a blank research worksheet.
- How to appeal without a lawyer — Gather evidence, check your township window, and file directly with Cook County.
- Cook County property tax exemptions: are you missing one? — Check which exemptions apply, renew automatically, or need annual filing.
- What happens after a Board of Review appeal? — Understand PTAB's role after a Board of Review decision and its filing instructions.
- How to find your Cook County PIN — Find your 14-digit PIN on county records and use it for filings and research.
- Cook County property tax appeal research guide — See how property records and comparable sales can support an assessment appeal.
Guide revision dates describe changes to this guidance. County calendar retrievals are shown separately above; confirm filing dates with the office receiving your appeal.