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

3911 BONNIE LN, ROUND ROCK, TX 78665

ROUND ROCK, 78665 — williamson County

4 bed2 bath1,643 sqftBuilt 2004

Property at a Glance

This home is estimated between $283,722 and $419,614, with a best estimate of $394,301. That places the property above the R409599G - STONEY BROOK - ALL SECTIONS median of $328,056, in a neighborhood that declined 4.7% over the past year.

Estimated Value Range

$283,722 $419,614
Best Estimate
$394,301
WCAD Value
$392,968
Medium Confidence

Based on 5 comparable properties(4 in the same subdivision)

Based on 5 comparable properties (4 in the same subdivision, 1 nearby), the estimated range is $283,722 and $419,614. More comparables in the same subdivision would strengthen this estimate.

Comparable Properties (5)

3913 BONNIE LN, ROUND ROCK, TX 78665
0.01 mi 100% similar Same subdivision
4 bed 2 bath 1,959 sqft Built 2003
Raw Value $475,415
Adjusted Value $398,135

Adjusted -$73,169 for 316 sqft less living space and -$4,111 for being older. Net adjustment: -$77,280.

1536 TONIA LOOP, ROUND ROCK, TX 78665
0.02 mi 100% similar Same subdivision
3 bed 2 bath 1,340 sqft Built 2005
Raw Value $320,032
Adjusted Value $394,301

Adjusted +$70,158 for 303 sqft more living space and +$4,111 for being newer. Net adjustment: +$74,269.

1532 TONIA LOOP, ROUND ROCK, TX 78665
0.02 mi 100% similar Same subdivision
4 bed 3 bath 1,744 sqft Built 2004
Raw Value $326,311
Adjusted Value $302,925

Adjusted -$23,386 for 101 sqft less living space. Net adjustment: -$23,386.

4 bed 2 bath 1,783 sqft Built 2006
Raw Value $443,807
Adjusted Value $419,614

Adjusted -$32,416 for 140 sqft less living space and +$8,223 for being newer. Net adjustment: -$24,193.

3915 BONNIE LN, ROUND ROCK, TX 78665
0.02 mi 100% similar Same subdivision
3 bed 2 bath 1,804 sqft Built 2003
Raw Value $325,112
Adjusted Value $283,722

Adjusted -$37,279 for 161 sqft less living space and -$4,111 for being older. Net adjustment: -$41,390.

The Neighborhood

This home is valued 19.8% above the R409599G - STONEY BROOK - ALL SECTIONS median of $328,056. With 197 homes in the subdivision, the property sits in the upper tier. Note that values in this subdivision declined 4.7% over the past year.

R409599G - STONEY BROOK - ALL SECTIONS

above average
197 Properties
$328,056 Median Value
-4.7% YoY Change
0% Have Pool
100% Have Garage
This Home
$392,968
Median
$328,056

This home is +19.8% above the subdivision median.

Tax Analysis

The estimated annual property tax is $7,071 across all districts. With a homestead exemption claimed, that drops to $5,748 — saving $1,323 per year. That's $479 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%$3,510
Round RockCity0.3720%$1,462
Williamson CountyCounty0.3694%$1,452
Austin Community Collegespecial0.1034%$406
Williamson County FM/RdCounty0.0443%$174
Upper Brushy Creek WCIDWater0.0170%$67
Williamson Central Appraisal Districtcad0.0000%$0
Total Annual Tax1.7993%$7,071

Mortgage Context

At today's 30-year mortgage rate of 6.38%, a buyer financing $394,301 would pay approximately $2,461 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