Cook County Value

12818 Rosa Ln Lemont, IL 60439

4 bed / 3 bath, 3,002 sqft, built 2023, in Lemont Assessor market value for 2026: $870,000.

Cook County account 22232090060000

Assessor market value
$870,000
Tax year 2026 · before exemptions; the assessed value on your notice is 10% of it
Living area
3,002 sqft
$290 per sqft
Year built
2023
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 22.5% from $710,000 in 2025 to $870,000 in 2026.
  • Assessor market value per square footThe current public record shows about $290 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 636 residential records in the same neighborhood, the average assessor market value is about $286 per square foot.
  • Area year-over-year signalNearby residential records with prior-year values moved about +33.3% on average.

Comparable assessments

Similar public appraisal records selected for this property's equity comparison.

  • 12777 Rosa Ln Lemont, IL 60439
    3,064 sqft | $268/sqft | built 2023 | Similar size (3,064 vs 3,002 sqft); Built same year (2023); Lot 13% smaller (11,699 vs 13,384 sqft)
    $820,000
  • 12831 Collina Ln Lemont, IL 60439
    2,873 sqft | $268/sqft | built 2016 | Similar size (2,873 vs 3,002 sqft); Lot 10% smaller (11,992 vs 13,384 sqft); Same quality (Average)
    $770,000
  • 12855 Collina Ln Lemont, IL 60439
    3,232 sqft | $266/sqft | built 2019 | 8% larger (3,232 vs 3,002 sqft); Similar age (2019 vs 2023); Lot 12% smaller (11,728 vs 13,384 sqft)
    $860,000
  • 12879 Collina Ln Lemont, IL 60439
    3,270 sqft | $260/sqft | built 2023 | 9% larger (3,270 vs 3,002 sqft); Built same year (2023); Lot 12% smaller (11,749 vs 13,384 sqft)
    $850,000
  • 12878 Collina Ln Lemont, IL 60439
    3,212 sqft | $258/sqft | built 2016 | 7% larger (3,212 vs 3,002 sqft); Lot 13% smaller (11,699 vs 13,384 sqft); Same quality (Average)
    $830,000

Recent comparable sales

Sales selected by similarity to the subject property.

  • 12655 Derry Dr Lemont, IL 60439
    June-29-2026 | 2,672 sqft | $266/sqft | built 2025 | 11% size difference (2,672 sqft); Similar age (2025); Sold after the valuation date
    $710,150
  • 12554 Eileen St Lemont, IL 60439
    June-29-2026 | 3,421 sqft | $272/sqft | built 2025 | 14% size difference (3,421 sqft); Similar age (2025); Sold after the valuation date
    $930,895
  • 1217 Woburn Dr Lemont, IL 60439
    2,576 sqft | $318/sqft | built 2016 | 14% size difference (2,576 sqft); Moderate age difference (7 years older); Same beds (4)
    $819,000

Public appraisal comparison for 2026. Prepared . Appraisal source: Cook County Assessor's Office. Sales data checked in this snapshot: . Showing the last prepared sales evidence while recent sales are refreshed. Matches consider available size, age, location and property characteristics. How comparisons work.

Value history

Up 22.5% in 2026 from 2025.

Assessor market value by tax year, with the change from the previous year listed
Tax yearAssessor market valueChangeChange %
2026$870,000+$160,000+22.5%
2025$710,000$00.0%
2024$710,000−$16,240−2.2%
2023$726,240+$686,090+1708.8%
2022$40,150$00.0%
2021$40,150$00.0%
2020$40,150——
6-year total+$829,850+2066.9%