Harris Value

21423 Fontana St, Tomball, TX 77377

2,991 sqft, built 1991 Appraised at $825,672 for 2026.

Harris County account 0420580010038

Appraised value
$825,672
Tax year 2026 · after any cap, before exemptions
Market value
$1,289,309
Living area
2,991 sqft
$276 per sqft
Year built
1991
Good 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 77377 and HCAD Appraisal Area 2576.05 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 $750,611 in 2025 to $825,672 in 2026.
  • Appraised value per square footThe current public record shows about $276 per square foot before any comparable-property adjustments.
  • Market/appraised spreadThe county market value is $463,637 above the appraised value used on this page.
  • Nearby comparison areaThis page starts the equity review with public records for ZIP 77377.
  • Neighborhood value signalAmong 67 residential records in the same neighborhood, the average appraised value is about $252 per square foot.
  • Area year-over-year signalNearby residential records with prior-year values moved about +18.3% on average.

Comparable assessments

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

  • 21503 Fontana St, Tomball, TX 77377
    2,935 sqft | $237/sqft | built 1990 | Similar size (2,935 vs 2,991 sqft); Similar age (1990 vs 1991); Similar lot size (129,787 vs 129,787 sqft)
    $696,209
  • 21603 Fontana St, Tomball, TX 77377
    3,172 sqft | $227/sqft | built 1995 | 6% larger (3,172 vs 2,991 sqft); Similar age (1995 vs 1991); Similar lot size (141,030 vs 129,787 sqft)
    $720,582
  • 21523 Fontana St, Tomball, TX 77377
    2,460 sqft | $255/sqft | built 1991 | Built same year (1991); Similar lot size (129,787 vs 129,787 sqft); Same quality (Good)
    $627,462
  • 21419 Fones Rd, Tomball, TX 77377
    2,800 sqft | $254/sqft | built 1990 | 6% smaller (2,800 vs 2,991 sqft); Similar age (1990 vs 1991); Same quality (Good)
    $710,291
  • 21327 Fontana St, Tomball, TX 77377
    2,582 sqft | $253/sqft | built 2003 | 14% smaller (2,582 vs 2,991 sqft); Similar lot size (130,946 vs 129,787 sqft); Same quality (Good)
    $652,729

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.

  • 15602 Gettysburg Dr, Tomball, TX 77377
    August-14-2026 | 2,979 sqft | $143/sqft | built 1990 | Similar size (2,979 sqft); Similar age (1990); Sold after the valuation date
    $425,000
  • 14902 Cactus Wren Dr, Tomball, TX 77377
    October-1-2026 | 2,844 sqft | $188/sqft | built 1996 | Similar size (2,844 sqft); Moderate age difference (5 years newer); Sold after the valuation date
    $535,000
  • 19307 Sun River Ln, Tomball, TX 77377
    August-21-2026 | 3,036 sqft | $140/sqft | built 1998 | Similar size (3,036 sqft); Moderate age difference (7 years newer); Sold after the valuation date
    $425,000
  • 16415 Lakestone Dr, Tomball, TX 77377
    August-19-2026 | 2,862 sqft | $118/sqft | built 1991 | Similar size (2,862 sqft); Similar age (1991); Sold after the valuation date
    $339,000
  • 15606 Lago Villa Dr, Tomball, TX 77377
    August-11-2026 | 2,799 sqft | $126/sqft | built 1992 | 6% size difference (2,799 sqft); Similar age (1992); Sold after the valuation date
    $353,000

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.