397 Blackthorne Dr, Plano, TX 75074

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 75074 and Plano Gateway Phase 1 assessment pages.

Protest deadline

The 2026 protest deadline was May 15, 2026. The 2027 protest deadline is May 17, 2027. 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 September 27, 2026 against the official source.

Assessment snapshot

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

• Assessment changeThe appraised value changed from $102,627 in 2025 to $434,990 in 2026. A change this large often reflects new construction, a reclassification or a record correction, so check it against the county record.
• Appraised value per square footThe current public record shows about $210 per square foot before any comparable-property adjustments.
• Nearby comparison areaThis page starts the equity review with public records for the Plano Gateway Phase 1 neighborhood and ZIP 75074.
• Neighborhood value signalAmong 116 residential records in the same neighborhood, the average appraised value is about $226 per square foot.

Public appraisal comparison for 2026. Prepared October 13, 2026. Appraisal source: Collin Central Appraisal District. Sales data checked in this snapshot: October 13, 2026. Matches consider available size, age, location and property characteristics. How comparisons work.

Value history

Up 323.9% in 2026 from 2025.