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

3929 BONNIE LN, ROUND ROCK, TX 78665

ROUND ROCK, 78665 — williamson County

4 bed3 bath862 sqftBuilt 2004

Property at a Glance

This home is estimated between $262,364 and $343,960, with a best estimate of $314,498. That places the property below the R409599G - STONEY BROOK - ALL SECTIONS median of $328,056, in a neighborhood that declined 4.7% over the past year.

Estimated Value Range

$262,364 $343,960
Best Estimate
$314,498
WCAD Value
$327,448
High Confidence

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

Based on 5 comparable properties in R409599G - STONEY BROOK - ALL SECTIONS, this home's estimated market value is between $262,364 and $343,960. All 5 comparables are in the same subdivision, giving this estimate high confidence.

Comparable Properties (5)

3931 BONNIE LN, ROUND ROCK, TX 78665
0.01 mi 100% similar Same subdivision
3 bed 2 bath 789 sqft Built 2004
Raw Value $327,057
Adjusted Value $343,960

Adjusted +$16,903 for 73 sqft more living space. Net adjustment: +$16,903.

3810 SANDY BROOK DR, ROUND ROCK, TX 78665
0.02 mi 99% similar Same subdivision
3 bed 2 bath 1,050 sqft Built 2006
Raw Value $351,190
Adjusted Value $315,882

Adjusted -$43,531 for 188 sqft less living space and +$8,223 for being newer. Net adjustment: -$35,308.

3933 BONNIE LN, ROUND ROCK, TX 78665
0.02 mi 99% similar Same subdivision
3 bed 2 bath 1,076 sqft Built 2003
Raw Value $316,026
Adjusted Value $262,364

Adjusted -$49,551 for 214 sqft less living space and -$4,111 for being older. Net adjustment: -$53,662.

1512 TONIA LOOP, ROUND ROCK, TX 78665
0.05 mi 98% similar Same subdivision
3 bed 2 bath 1,083 sqft Built 2006
Raw Value $357,447
Adjusted Value $314,498

Adjusted -$51,172 for 221 sqft less living space and +$8,223 for being newer. Net adjustment: -$42,949.

1508 TONIA LOOP, ROUND ROCK, TX 78665
0.03 mi 98% similar Same subdivision
4 bed 2 bath 1,280 sqft Built 2006
Raw Value $378,359
Adjusted Value $289,796

Adjusted -$96,786 for 418 sqft less living space and +$8,223 for being newer. Net adjustment: -$88,563.

The Neighborhood

This home is in line with the R409599G - STONEY BROOK - ALL SECTIONS median of $328,056. Note that values in this subdivision declined 4.7% over the past year.

R409599G - STONEY BROOK - ALL SECTIONS

typical
197 Properties
$328,056 Median Value
-4.7% YoY Change
0% Have Pool
100% Have Garage
This Home
$327,448
Median
$328,056

This home is -0.2% below the subdivision median.

Tax Analysis

The estimated annual property tax is $5,892 across all districts. With a homestead exemption claimed, that drops to $4,581 — saving $1,311 per year. That's $382 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
Round Rock ISDSchool0.8931%$2,924
Round RockCity0.3720%$1,218
Williamson CountyCounty0.3694%$1,210
Austin Community Collegespecial0.1034%$339
Williamson County FM/RdCounty0.0443%$145
Upper Brushy Creek WCIDWater0.0170%$56
Williamson Central Appraisal Districtcad0.0000%$0
Total Annual Tax1.7993%$5,892

Mortgage Context

At today's 30-year mortgage rate of 6.38%, a buyer financing $314,498 would pay approximately $1,963 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