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3927 BONNIE LN, ROUND ROCK, TX 78665

ROUND ROCK, 78665 — williamson County

4 bed2 bath1,964 sqftBuilt 2003

Property at a Glance

This home is estimated between $268,740 and $549,071, with a best estimate of $361,297. 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

$268,740 $549,071
Best Estimate
$361,297
WCAD Value
$471,948
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 $268,740 and $549,071. All 5 comparables are in the same subdivision, giving this estimate high confidence.

Comparable Properties (5)

3925 BONNIE LN, ROUND ROCK, TX 78665
0.01 mi 100% similar Same subdivision
3 bed 2 bath 1,577 sqft Built 2003
Raw Value $331,519
Adjusted Value $421,127

Adjusted +$89,608 for 387 sqft more living space. Net adjustment: +$89,608.

1508 TONIA LOOP, ROUND ROCK, TX 78665
0.02 mi 100% similar Same subdivision
4 bed 2 bath 1,280 sqft Built 2006
Raw Value $378,359
Adjusted Value $549,071

Adjusted +$158,378 for 684 sqft more living space and +$12,334 for being newer. Net adjustment: +$170,712.

1504 TONIA LOOP, ROUND ROCK, TX 78665
0.02 mi 100% similar Same subdivision
3 bed 2 bath 2,133 sqft Built 2007
Raw Value $312,522
Adjusted Value $289,836

Adjusted -$39,131 for 169 sqft less living space and +$16,445 for being newer. Net adjustment: -$22,686.

3814 SANDY BROOK DR, ROUND ROCK, TX 78665
0.03 mi 100% similar Same subdivision
3 bed 2 bath 1,868 sqft Built 2006
Raw Value $326,735
Adjusted Value $361,297

Adjusted +$22,228 for 96 sqft more living space and +$12,334 for being newer. Net adjustment: +$34,562.

3921 BONNIE LN, ROUND ROCK, TX 78665
0.03 mi 100% similar Same subdivision
3 bed 2 bath 2,245 sqft Built 2003
Raw Value $333,804
Adjusted Value $268,740

Adjusted -$65,064 for 281 sqft less living space. Net adjustment: -$65,064.

The Neighborhood

This home is valued 43.9% 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
$471,948
Median
$328,056

This home is +43.9% above the subdivision median.

Tax Analysis

The estimated annual property tax is $8,492 across all districts. With a homestead exemption claimed, that drops to $7,154 — saving $1,338 per year. That's $596 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%$4,215
Round RockCity0.3720%$1,756
Williamson CountyCounty0.3694%$1,744
Austin Community Collegespecial0.1034%$488
Williamson County FM/RdCounty0.0443%$209
Upper Brushy Creek WCIDWater0.0170%$80
Williamson Central Appraisal Districtcad0.0000%$0
Total Annual Tax1.7993%$8,492

Mortgage Context

At today's 30-year mortgage rate of 6.38%, a buyer financing $361,297 would pay approximately $2,255 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.

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