Williamson Value property tax analysis

5866 Casstello Dr, Round Rock, TX 78665

2 bathrooms, 1,791 sqft, built 2015, in H123414C - Siena Limmer Loop Appraised at $368,099 for 2026.

Williamson County account 338941

Appraised value
$368,099
Tax year 2026
Market value
$368,099
Living area
1,791 sqft
$206 per sqft
Year built
2015

Why this page matters for a protest

A strong tax protest page needs the county value, property facts, and enough context to compare this home with similar properties nearby. This page gives homeowners a starting point before reviewing comparable homes and prior-year changes.

The county value changed -7.3% from $396,949 in 2025 to $368,099 in 2026.