Harris Value

3719 Cosby St, Houston, TX 77021

980 sqft, built 1940, in South Side Appraised at $155,424 for 2026.

Harris County account 0770890030022

Appraised value
$155,424
Tax year 2026 · after any cap, before exemptions
Market value
$155,499
Living area
980 sqft
$159 per sqft
Year built
1940
Average quality
Homestead
Yes
Owner-occupied exemption on file

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 77021 and South Side assessment pages.

Protest deadline

The 2026 protest deadline was . The 2027 protest deadline is . 2027 notices usually arrive in April.

Deadline rule: May 15, or 30 days after your notice of appraised value is delivered, whichever is later. A deadline on a weekend or holiday moves to the next business day. Evidence is reviewed by the Appraisal Review Board (ARB). Dates checked against the official source.

Assessment snapshot

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

  • Assessment changeThe appraised value increased 10.0% from $141,295 in 2025 to $155,424 in 2026.
  • Appraised value per square footThe current public record shows about $159 per square foot before any comparable-property adjustments.
  • Market/appraised spreadThe county market value is $75 above the appraised value used on this page.
  • Nearby comparison areaThis page starts the equity review with public records for the South Side neighborhood and ZIP 77021.
  • Neighborhood value signalAmong 457 residential records in the same neighborhood, the average appraised value is about $137 per square foot.
  • Area year-over-year signalNearby residential records with prior-year values moved about +3.9% on average.

Comparable assessments

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

  • 3718 Cosby St, Houston, TX 77021
    984 sqft | $159/sqft | built 1940 | Similar size (984 vs 980 sqft); Built same year (1940); Similar lot size (7,068 vs 7,068 sqft)
    $156,278
  • 3722 Cosby St, Houston, TX 77021
    972 sqft | $159/sqft | built 1940 | Similar size (972 vs 980 sqft); Built same year (1940); Similar lot size (7,006 vs 7,068 sqft)
    $154,957
  • 3618 Idaho St, Houston, TX 77021
    1,002 sqft | $149/sqft | built 1940 | Similar size (1,002 vs 980 sqft); Built same year (1940); Similar lot size (6,900 vs 7,068 sqft)
    $149,771
  • 3703 Idaho St, Houston, TX 77021
    988 sqft | $155/sqft | built 1940 | Similar size (988 vs 980 sqft); Built same year (1940); Similar lot size (6,600 vs 7,068 sqft)
    $152,995
  • 3607 Idaho St, Houston, TX 77021
    988 sqft | $155/sqft | built 1940 | Similar size (988 vs 980 sqft); Built same year (1940); Similar lot size (6,600 vs 7,068 sqft)
    $152,995

Recent comparable sales

Sales selected by similarity to the subject property. Texas is a non-disclosure state, so these MLS-listed sales are supplemental evidence.

  • 3711 Cosby St, Houston, TX 77021
    September-30-2026 | 970 sqft | $154/sqft | built 1940 | Similar size (970 sqft); Similar age (1940); Sold after the valuation date
    $149,000
  • 6226 Sherwood Dr, Houston, TX 77021
    September-15-2026 | 1,073 sqft | $107/sqft | built 1940 | 10% size difference (1,073 sqft); Similar age (1940); Sold after the valuation date
    $114,900
  • 6103 Sherwood Dr, Houston, TX 77021
    May-26-2026 | 1,056 sqft | $109/sqft | built 1940 | 8% size difference (1,056 sqft); Similar age (1940); Sold after the valuation date
    $115,000
  • 4914 Yellowstone Blvd, Houston, TX 77021
    August-21-2026 | 1,090 sqft | $146/sqft | built 1955 | 11% size difference (1,090 sqft); Sold after the valuation date
    $159,000
  • 6604 Conley St, Houston, TX 77021
    July-7-2026 | 960 sqft | $94/sqft | built 1950 | Similar size (960 sqft); Moderate age difference (10 years newer); Sold after the valuation date
    $89,882

Public appraisal comparison for 2026. Prepared . Appraisal source: Harris County Appraisal District. 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.