Beta Williamson County, TX only — data and coverage are limited during early access.

8001 MOZART ST, ROUND ROCK, TX 78665

ROUND ROCK, 78665 — williamson County

4 bed3 bath2,143 sqftBuilt 2016

Property at a Glance

This home is estimated between $380,833 and $560,163, with a best estimate of $421,076. That places the property above the H121413C - SIENA median of $406,354, in a neighborhood that declined 5.4% over the past year.

Estimated Value Range

$380,833 $560,163
Best Estimate
$421,076
WCAD Value
$441,253
High Confidence

Based on 5 comparable properties(5 in the same subdivision)

Based on 5 comparable properties in H121413C - SIENA, this home's estimated market value is between $380,833 and $560,163. All 5 comparables are in the same subdivision, giving this estimate high confidence.

Comparable Properties (5)

6041 ROMA ST, ROUND ROCK, TX 78665
0.00 mi 100% similar Same subdivision
4 bed 3 bath 1,748 sqft Built 2014
Raw Value $456,427
Adjusted Value $544,391

Adjusted +$83,507 for 395 sqft more living space and +$4,457 for being newer. Net adjustment: +$87,964.

7836 LEONARDO DR, ROUND ROCK, TX 78665
0.00 mi 100% similar Same subdivision
3 bed 2 bath 1,961 sqft Built 2017
Raw Value $379,331
Adjusted Value $415,579

Adjusted +$38,477 for 182 sqft more living space and -$2,229 for being older. Net adjustment: +$36,248.

5608 SAMBUCO ST, ROUND ROCK, TX 78665
0.00 mi 100% similar Same subdivision
3 bed 2 bath 2,173 sqft Built 2017
Raw Value $429,647
Adjusted Value $421,076

Adjusted -$6,342 for 30 sqft less living space and -$2,229 for being older. Net adjustment: -$8,571.

5918 PARMA ST, ROUND ROCK, TX 78665
0.00 mi 100% similar Same subdivision
3 bed 2 bath 2,227 sqft Built 2015
Raw Value $396,362
Adjusted Value $380,833

Adjusted -$17,758 for 84 sqft less living space and +$2,229 for being newer. Net adjustment: -$15,529.

8379 PAOLA ST, ROUND ROCK, TX 78665
0.00 mi 100% similar Same subdivision
4 bed 3 bath 2,313 sqft Built 2015
Raw Value $593,874
Adjusted Value $560,163

Adjusted -$35,940 for 170 sqft less living space and +$2,229 for being newer. Net adjustment: -$33,711.

The Neighborhood

This home is valued 8.6% above the H121413C - SIENA median of $406,354. With 1,611 homes in the subdivision, the property sits in the upper tier. Note that values in this subdivision declined 5.4% over the past year.

H121413C - SIENA

typical
1,611 Properties
$406,354 Median Value
-5.4% YoY Change
1% Have Pool
100% Have Garage
This Home
$441,253
Median
$406,354

This home is +8.6% above the subdivision median.

Tax Analysis

The estimated annual property tax is $10,157 across all districts. With a homestead exemption claimed, that drops to $8,388 — saving $1,769 per year. That's $699 per month a buyer should budget. The assessed value increased roughly in line with the neighborhood, so a tax protest is unlikely to yield significant savings.

Tax Districts

DistrictTypeRateAnnual Amount
Hutto ISDSchool1.2052%$5,318
Siena MUD #1MUD0.5250%$2,317
Williamson CountyCounty0.3694%$1,630
Williamson County ESD #3 - HuttoESD0.1000%$441
Williamson County FM/RdCounty0.0443%$196
EWC Higher Ed Centerspecial0.0409%$180
Upper Brushy Creek WCIDWater0.0170%$75
Williamson Central Appraisal Districtcad0.0000%$0
Total Annual Tax2.3018%$10,157

Mortgage Context

At today's 30-year mortgage rate of 6.38%, a buyer financing $421,076 would pay approximately $2,628 per month (principal and interest only, excluding taxes and insurance).

Data sourced from Williamson County Appraisal District (WCAD), Texas Education Agency (TEA), and Federal Reserve Economic Data (FRED). Assessment values reflect the appraisal district's estimate, not market sale prices. Report generated 4/18/2026.

View full property details