Collin Value

821 Allen St, Prosper, TX 75078

3,578 sqft, built 2015, in Crestview At Prosper Phase 2. Appraised at $801,141 for 2026.

Collin County account 2708515

Appraised value
$801,141
Tax year 2026
Living area
3,578 sqft
$224 per sqft
Year built
2015
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 75078, Crestview At Prosper Phase 2, Celina, and Prosper 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 mailed, 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 CCAD records highlight what may be worth checking before you file.

  • Assessment changeThe appraised value decreased 3.4% from $829,527 in 2025 to $801,141 in 2026.
  • Appraised value per square footThe current public record shows about $224 per square foot before any comparable-property adjustments.
  • Nearby comparison areaThis page starts the equity review with public records for the Crestview At Prosper Phase 2 neighborhood and ZIP 75078.
  • Neighborhood value signalAmong 75 residential records in the same neighborhood, the average appraised value is about $214 per square foot.
  • Area year-over-year signalNearby residential records with prior-year values moved about -3.5% on average.

Comparable assessments

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

  • 860 Allen St, Prosper, TX 75078
    3,597 sqft | $218/sqft | built 2015 | Similar size (3,597 vs 3,578 sqft); Built same year (2015); Similar lot size (13,872 vs 13,728 sqft)
    $782,656
  • 860 Jessica Ct, Prosper, TX 75078
    3,834 sqft | $221/sqft | built 2015 | 7% larger (3,834 vs 3,578 sqft); Built same year (2015); Similar lot size (13,041 vs 13,728 sqft)
    $847,161
  • 670 Sibyl Ln, Prosper, TX 75078
    3,805 sqft | $212/sqft | built 2012 | 6% larger (3,805 vs 3,578 sqft); Similar age (2012 vs 2015); Similar lot size (13,154 vs 13,728 sqft)
    $805,061
  • 541 Logans Way Ct, Prosper, TX 75078
    3,527 sqft | $213/sqft | built 2012 | Similar size (3,527 vs 3,578 sqft); Similar age (2012 vs 2015); Lot 13% smaller (11,910 vs 13,728 sqft)
    $751,527
  • 1020 Jessica Ln, Prosper, TX 75078
    3,870 sqft | $214/sqft | built 2012 | 8% larger (3,870 vs 3,578 sqft); Similar age (2012 vs 2015); Similar lot size (14,256 vs 13,728 sqft)
    $826,662

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.

  • 770 Evening Sun Dr, Prosper, TX 75078
    August-31-2026 | 3,759 sqft | $205/sqft | built 2013 | 5% size difference (3,759 sqft); Similar age (2013); Sold after the valuation date
    $770,000
  • 1600 Cottonwood Trl, Prosper, TX 75078
    August-24-2026 | 3,600 sqft | $290/sqft | built 2019 | Similar size (3,600 sqft); Moderate age difference (4 years newer); Sold after the valuation date
    $1,045,000
  • 520 Devonshire Dr, Prosper, TX 75078
    September-16-2026 | 3,641 sqft | $206/sqft | built 2010 | Similar size (3,641 sqft); Moderate age difference (5 years older); Sold after the valuation date
    $749,950
  • 1831 Lexington Ave, Prosper, TX 75078
    July-20-2026 | 3,594 sqft | $260/sqft | built 2019 | Similar size (3,594 sqft); Moderate age difference (4 years newer); Sold after the valuation date
    $935,000
  • 1971 Cornell Dr, Prosper, TX 75078
    June-22-2026 | 3,601 sqft | $326/sqft | built 2020 | Similar size (3,601 sqft); Moderate age difference (5 years newer); Sold after the valuation date
    $1,175,000

Public appraisal comparison for 2026. Prepared . Appraisal source: Collin Central Appraisal District. Sales data checked in this snapshot: . Matches consider available size, age, location and property characteristics. How comparisons work.

Value history

Down 3.4% in 2026 from 2025.

Appraised value by tax year, with the change from the previous year listed
Tax yearAppraised valueChangeChange %
2026$801,141−$28,386−3.4%
2025$829,527−$61,112−6.9%
2024$890,639+$27,719+3.2%
2023$862,920+$116,920+15.7%
2022$746,000+$191,905+34.6%
2021$554,095+$25,107+4.7%
2020$528,988——
6-year total+$272,153+51.4%