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

3924 BONNIE LN, ROUND ROCK, TX 78665

ROUND ROCK, 78665 — williamson County

3 bed2 bath1,822 sqftBuilt 2004

Property at a Glance

This home is estimated between $218,245 and $433,776, with a best estimate of $349,641. 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

$218,245 $433,776
Best Estimate
$349,641
WCAD Value
$320,950
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 $218,245 and $433,776. More comparables in the same subdivision would strengthen this estimate.

Comparable Properties (5)

3922 BONNIE LN, ROUND ROCK, TX 78665
0.01 mi 100% similar Same subdivision
4 bed 3 bath 1,884 sqft Built 2004
Raw Value $426,438
Adjusted Value $412,082

Adjusted -$14,356 for 62 sqft less living space. Net adjustment: -$14,356.

3926 BONNIE LN, ROUND ROCK, TX 78665
0.01 mi 100% similar Same subdivision
3 bed 2 bath 2,272 sqft Built 2003
Raw Value $326,552
Adjusted Value $218,245

Adjusted -$104,196 for 450 sqft less living space and -$4,111 for being older. Net adjustment: -$108,307.

3 bed 2 bath 2,021 sqft Built 2007
Raw Value $383,385
Adjusted Value $349,641

Adjusted -$46,078 for 199 sqft less living space and +$12,334 for being newer. Net adjustment: -$33,744.

1551 LORSON LOOP, ROUND ROCK, TX 78665
0.02 mi 100% similar Same subdivision
4 bed 2 bath 1,540 sqft Built 2003
Raw Value $372,591
Adjusted Value $433,776

Adjusted +$65,296 for 282 sqft more living space and -$4,111 for being older. Net adjustment: +$61,185.

3920 BONNIE LN, ROUND ROCK, TX 78665
0.02 mi 100% similar Same subdivision
3 bed 2 bath 1,989 sqft Built 2003
Raw Value $306,947
Adjusted Value $264,168

Adjusted -$38,668 for 167 sqft less living space and -$4,111 for being older. Net adjustment: -$42,779.

The Neighborhood

This home is valued 2.2% below the R409599G - STONEY BROOK - ALL SECTIONS median of $328,056. That positions it competitively for buyers comparing within the neighborhood. 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
$320,950
Median
$328,056

This home is -2.2% below the subdivision median.

Tax Analysis

The estimated annual property tax is $5,775 across all districts. With a homestead exemption claimed, that drops to $4,465 — saving $1,310 per year. That's $372 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%$2,866
Round RockCity0.3720%$1,194
Williamson CountyCounty0.3694%$1,186
Austin Community Collegespecial0.1034%$332
Williamson County FM/RdCounty0.0443%$142
Upper Brushy Creek WCIDWater0.0170%$55
Williamson Central Appraisal Districtcad0.0000%$0
Total Annual Tax1.7993%$5,775

Mortgage Context

At today's 30-year mortgage rate of 6.38%, a buyer financing $349,641 would pay approximately $2,182 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