Cook County Value

856 Oak St, Winnetka, IL 60093

5 bed / 4 bath, 3,276 sqft, built 2009, in New Trier. Assessor market value for 2026: $1,802,260.

Cook County account 05202160020000

Assessor market value
$1,802,260
Tax year 2026 · before exemptions; the assessed value on your notice is 10% of it
Living area
3,276 sqft
$550 per sqft
Year built
2009
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 60093 and New Trier assessment pages.

Local guide: New Trier Township 2026 Property Tax Appeal Guide.

Appeal deadlines

The 2026 appeal windows for New Trier have closed (Assessor , Board of Review ). 2027 notices usually start in March.

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 decreased 9.4% from $1,990,310 in 2025 to $1,802,260 in 2026.
  • Assessor market value per square footThe current public record shows about $550 per square foot before any comparable-property adjustments.
  • Nearby comparison areaThis page starts the equity review with public records for the New Trier neighborhood and ZIP 60093.
  • Neighborhood value signalAmong 609 residential records in the same neighborhood, the average assessor market value is about $514 per square foot.
  • Area year-over-year signalNearby residential records with prior-year values moved about -2.0% on average.

Comparable assessments

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

  • 1041 Oak St, Winnetka, IL 60093
    3,334 sqft | $612/sqft | built 2009 | Similar size (3,334 vs 3,276 sqft); Built same year (2009); Similar lot size (8,850 vs 8,804 sqft)
    $2,040,010
  • 1092 Oak St, Winnetka, IL 60093
    3,283 sqft | $618/sqft | built 2009 | Similar size (3,283 vs 3,276 sqft); Built same year (2009); Similar lot size (8,850 vs 8,804 sqft)
    $2,030,010
  • 847 Cherry St, Winnetka, IL 60093
    3,172 sqft | $560/sqft | built 2006 | Similar size (3,172 vs 3,276 sqft); Similar age (2006 vs 2009); Similar lot size (8,782 vs 8,804 sqft)
    $1,777,850
  • 1096 Ash St, Winnetka, IL 60093
    3,368 sqft | $561/sqft | built 2009 | Similar size (3,368 vs 3,276 sqft); Built same year (2009); Similar lot size (8,850 vs 8,804 sqft)
    $1,890,010
  • 603 Provident Ave, Winnetka, IL 60093
    3,288 sqft | $580/sqft | built 2003 | Similar size (3,288 vs 3,276 sqft); Similar lot size (8,556 vs 8,804 sqft); Same quality (Average)
    $1,905,630

Recent comparable sales

Sales selected by similarity to the subject property.

  • 2404 Fox Meadow Ln Northfield, IL 60093
    3,274 sqft | $521/sqft | built 2000 | Similar size (3,274 sqft); Moderate age difference (9 years older)
    $1,706,500
  • 358 Winnetka Ave, IL 60093
    3,631 sqft | $826/sqft | built 2004 | 11% size difference (3,631 sqft); Moderate age difference (5 years older); Within 1 bedroom (4 vs 5)
    $3,000,000

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

Down 9.4% in 2026 from 2025.

Assessor market value by tax year, with the change from the previous year listed
Tax yearAssessor market valueChangeChange %
2026$1,802,260−$188,050−9.4%
2025$1,990,310+$582,600+41.4%
2024$1,407,710——
2-year total+$394,550+28.0%