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

3901 BONNIE LN, ROUND ROCK, TX 78665

ROUND ROCK, 78665 — williamson County

4 bed2 bath1,977 sqftBuilt 2000

Property at a Glance

This home is estimated between $246,911 and $628,130, with a best estimate of $375,606. 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

$246,911 $628,130
Best Estimate
$375,606
WCAD Value
$477,141
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 $246,911 and $628,130. More comparables in the same subdivision would strengthen this estimate.

Comparable Properties (5)

1507 LORSON LOOP, ROUND ROCK, TX 78665
0.02 mi 100% similar Same subdivision
3 bed 2 bath 2,281 sqft Built 1999
Raw Value $321,412
Adjusted Value $246,911

Adjusted -$70,390 for 304 sqft less living space and -$4,111 for being older. Net adjustment: -$74,501.

4 bed 2 bath 1,779 sqft Built 1998
Raw Value $590,507
Adjusted Value $628,130

Adjusted +$45,846 for 198 sqft more living space and -$8,223 for being older. Net adjustment: +$37,623.

3905 BONNIE LN, ROUND ROCK, TX 78665
0.02 mi 100% similar Same subdivision
3 bed 2 bath 1,822 sqft Built 2004
Raw Value $323,271
Adjusted Value $375,606

Adjusted +$35,890 for 155 sqft more living space and +$16,445 for being newer. Net adjustment: +$52,335.

1512 LORSON LOOP, ROUND ROCK, TX 78665
0.03 mi 100% similar Same subdivision
3 bed 2 bath 2,226 sqft Built 1999
Raw Value $316,675
Adjusted Value $254,909

Adjusted -$57,655 for 249 sqft less living space and -$4,111 for being older. Net adjustment: -$61,766.

1505 LORSON LOOP, ROUND ROCK, TX 78665
0.03 mi 100% similar Same subdivision
4 bed 2 bath 1,293 sqft Built 1999
Raw Value $385,663
Adjusted Value $539,930

Adjusted +$158,378 for 684 sqft more living space and -$4,111 for being older. Net adjustment: +$154,267.

The Neighborhood

This home is valued 45.4% 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
$477,141
Median
$328,056

This home is +45.4% above the subdivision median.

Tax Analysis

The estimated annual property tax is $8,585 across all districts. With a homestead exemption claimed, that drops to $7,247 — saving $1,338 per year. That's $604 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%$4,261
Round RockCity0.3720%$1,775
Williamson CountyCounty0.3694%$1,763
Austin Community Collegespecial0.1034%$493
Williamson County FM/RdCounty0.0443%$212
Upper Brushy Creek WCIDWater0.0170%$81
Williamson Central Appraisal Districtcad0.0000%$0
Total Annual Tax1.7993%$8,585

Mortgage Context

At today's 30-year mortgage rate of 6.38%, a buyer financing $375,606 would pay approximately $2,345 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