Cook County Value

802 Warner Ave Lemont, IL 60439

5 bed / 3 bath, 2,776 sqft, built 1893, in Lemont. Assessor market value for 2026: $550,000.

Cook County account 22291130300000

Assessor market value
$550,000
Tax year 2026 · before exemptions; the assessed value on your notice is 10% of it
Living area
2,776 sqft
$198 per sqft
Year built
1893
Average quality

Compare this assessment

Start with the county value and property facts, then review appraisal comps, recent sales, and prior-year changes to decide whether the assessment is worth challenging. The comps on this page are free to review; email sign-in is only used to save a printable report.

For nearby context, browse ZIP 60439 and Lemont assessment pages.

Local guide: Lemont Township 2026 Property Tax Appeal Guide.

Appeal deadlines

For Lemont, appeals to the Assessor closed . Board of Review dates for Lemont have not been published yet.

Deadline rule: Set by township: file with the Assessor by your township's last file date, and with the Board of Review while your township is open there. Evidence is reviewed by the Cook County Assessor's Office or, in a separate appeal, by the Cook County Board of Review. Dates checked against the official source.

Assessment snapshot

These public CCAO records highlight what may be worth checking before you file.

  • Assessment changeThe assessor market value increased 31.0% from $420,000 in 2025 to $550,000 in 2026.
  • Assessor market value per square footThe current public record shows about $198 per square foot before any comparable-property adjustments.
  • Nearby comparison areaThis page starts the equity review with public records for the Lemont neighborhood and ZIP 60439.
  • Neighborhood value signalAmong 1,277 residential records in the same neighborhood, the average assessor market value is about $255 per square foot.
  • Area year-over-year signalNearby residential records with prior-year values moved about +25.5% on average.

Comparable assessments

Showing 5 of the 8 similar homes in this property's equity comparison, from public appraisal records.

  • 711 Walnut St Lemont, IL 60439
    2,606 sqft | $188/sqft | built 1893 | 6% smaller (2,606 vs 2,776 sqft); Built same year (1893); Similar lot size (8,973 vs 8,280 sqft)
    $490,000
  • 221 Freehauf St Lemont, IL 60439
    3,026 sqft | $172/sqft | built 1905 | 9% larger (3,026 vs 2,776 sqft); Similar lot size (8,400 vs 8,280 sqft); Same quality (Average)
    $520,000
  • 916 Singer Ave Lemont, IL 60439
    2,489 sqft | $197/sqft | built 1885 | 10% smaller (2,489 vs 2,776 sqft); Similar lot size (8,520 vs 8,280 sqft); Same quality (Average)
    $490,000
  • 523 Czacki St Lemont, IL 60439
    2,435 sqft | $205/sqft | built 1906 | 12% smaller (2,435 vs 2,776 sqft); Similar lot size (8,160 vs 8,280 sqft); Same quality (Average)
    $500,000
  • 317 Freehauf St Lemont, IL 60439
    2,578 sqft | $155/sqft | built 1891 | 7% smaller (2,578 vs 2,776 sqft); Similar age (1891 vs 1893); Lot 19% smaller (6,708 vs 8,280 sqft)
    $400,010

Recent comparable sales

No usable comparable sales are available in this data snapshot.

Public appraisal comparison for 2026. Prepared . Appraisal source: Cook County Assessor's Office. Sales data checked in this snapshot: . Matches consider available size, age, location and property characteristics. How comparisons work.

Value history

Up 31.0% in 2026 from 2025.

Assessor market value by tax year, with the change from the previous year listed
Tax yearAssessor market valueChangeChange %
2026$550,000+$130,000+31.0%
2025$420,000$00.0%
2024$420,000$00.0%
2023$420,000+$101,680+31.9%
2022$318,320$00.0%
2021$318,320+$100.0%
2020$318,310——
6-year total+$231,690+72.8%