Cook County Value

3 Martin Ct Lemont, IL 60439

5 bed / 5 bath, 4,020 sqft, built 2025, in Lemont Assessor market value for 2026: $1,450,000.

Cook County account 22242050150000

Likely too high

about $353,000

8 similar homes nearby point to a value about $353,000 lower than yours.

Assessor market value$1,450,000
Similar homes$1,096,776
$353,224 gap · bars start at $0

How sure: High · 8 similar homes (5 shown below) · public records only

Assessor market value
$1,450,000
Tax year 2026 · before exemptions; the assessed value on your notice is 10% of it
Living area
4,020 sqft
$361 per sqft
Year built
2025
Average quality

Why we think so

Similar homes' assessments

Strong

7 of 8 similar homes are assessed lower per square foot. Their similarity-weighted median is $261.68/sqft, but land is valued apart from the home, and some of them have less land value per square foot of home than yours, which counts as $233,100. Counting your land in place of theirs where theirs is less, they support a value of $1,096,776.

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 changed from $639,440 in 2025 to $1,450,000 in 2026. A change this large often reflects new construction, a reclassification or a record correction, so check it against the county record.
  • Assessor market value per square footThe current public record shows about $361 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 321 residential records in the same neighborhood, the average assessor market value is about $244 per square foot.
  • Area year-over-year signalNearby residential records with prior-year values moved about +52.5% on average.

Comparable assessments

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

  • 52 Brookside Dr Lemont, IL 60439
    4,041 sqft | $380/sqft | built 2025 | Similar size (4,041 vs 4,020 sqft); Built same year (2025); Same quality (Average)
    $1,534,500
  • 42 Horseshoe Ln Lemont, IL 60439
    3,951 sqft | $256/sqft | built 2001 | Similar size (3,951 vs 4,020 sqft); Similar lot size (59,372 vs 62,160 sqft); Same quality (Average)
    $1,010,010
  • 11201 Dineff Rd Lemont, IL 60439
    4,169 sqft | $235/sqft | built 2001 | Similar size (4,169 vs 4,020 sqft); Lot 11% smaller (55,190 vs 62,160 sqft); Same quality (Average)
    $980,000
  • 1 115th St Lemont, IL 60439
    4,483 sqft | $262/sqft | built 2001 | 12% larger (4,483 vs 4,020 sqft); Similar lot size (56,000 vs 62,160 sqft); Same quality (Average)
    $1,173,130
  • 62 Horseshoe Ln Lemont, IL 60439
    3,682 sqft | $337/sqft | built 2009 | 8% smaller (3,682 vs 4,020 sqft); Same quality (Average); Same neighborhood
    $1,241,000

Recent comparable sales

Sales selected by similarity to the subject property.

  • 12554 Eileen St Lemont, IL 60439
    June-29-2026 | 3,421 sqft | $272/sqft | built 2025 | 15% size difference (3,421 sqft); Similar age (2025); Sold after the valuation date
    $930,895

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 126.8% in 2026 from 2025.

Assessor market value by tax year, with the change from the previous year listed
Tax yearAssessor market valueChangeChange %
2026$1,450,000+$810,560+126.8%
2025$639,440+$242,420+61.1%
2024$397,020$00.0%
2023$397,020−$38,400−8.8%
2022$435,420$00.0%
2021$435,420−$38,980−8.2%
2020$474,400——
6-year total+$975,600+205.6%