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

3922 BONNIE LN, ROUND ROCK, TX 78665

ROUND ROCK, 78665 — williamson County

4 bed3 bath1,884 sqftBuilt 2004

Property at a Glance

This home is estimated between $260,911 and $482,538, with a best estimate of $335,306. 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

$260,911 $482,538
Best Estimate
$335,306
WCAD Value
$426,438
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 $260,911 and $482,538. More comparables in the same subdivision would strengthen this estimate.

Comparable Properties (5)

3924 BONNIE LN, ROUND ROCK, TX 78665
0.01 mi 100% similar Same subdivision
3 bed 2 bath 1,822 sqft Built 2004
Raw Value $320,950
Adjusted Value $335,306

Adjusted +$14,356 for 62 sqft more living space. Net adjustment: +$14,356.

3920 BONNIE LN, ROUND ROCK, TX 78665
0.01 mi 100% similar Same subdivision
3 bed 2 bath 1,989 sqft Built 2003
Raw Value $306,947
Adjusted Value $278,524

Adjusted -$24,312 for 105 sqft less living space and -$4,111 for being older. Net adjustment: -$28,423.

1547 LORSON LOOP, ROUND ROCK, TX 78665
0.02 mi 100% similar Same subdivision
4 bed 2 bath 1,738 sqft Built 2003
Raw Value $388,747
Adjusted Value $418,442

Adjusted +$33,806 for 146 sqft more living space and -$4,111 for being older. Net adjustment: +$29,695.

1545 LORSON LOOP, ROUND ROCK, TX 78665
0.02 mi 100% similar Same subdivision
3 bed 2 bath 2,089 sqft Built 2002
Raw Value $316,601
Adjusted Value $260,911

Adjusted -$47,467 for 205 sqft less living space and -$8,223 for being older. Net adjustment: -$55,690.

4 bed 3 bath 1,895 sqft Built 2006
Raw Value $476,862
Adjusted Value $482,538

Adjusted -$2,547 for 11 sqft less living space and +$8,223 for being newer. Net adjustment: +$5,676.

The Neighborhood

This home is valued 30.0% 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
$426,438
Median
$328,056

This home is +30.0% above the subdivision median.

Tax Analysis

The estimated annual property tax is $7,673 across all districts. With a homestead exemption claimed, that drops to $6,344 — saving $1,329 per year. That's $529 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%$3,809
Round RockCity0.3720%$1,586
Williamson CountyCounty0.3694%$1,575
Austin Community Collegespecial0.1034%$441
Williamson County FM/RdCounty0.0443%$189
Upper Brushy Creek WCIDWater0.0170%$72
Williamson Central Appraisal Districtcad0.0000%$0
Total Annual Tax1.7993%$7,673

Mortgage Context

At today's 30-year mortgage rate of 6.38%, a buyer financing $335,306 would pay approximately $2,093 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