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

1504 TONIA LOOP, ROUND ROCK, TX 78665

ROUND ROCK, 78665 — williamson County

3 bed2 bath2,133 sqftBuilt 2007

Property at a Glance

This home is estimated between $338,634 and $494,634, with a best estimate of $391,402. 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

$338,634 $494,634
Best Estimate
$391,402
WCAD Value
$312,522
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 $338,634 and $494,634. All 5 comparables are in the same subdivision, giving this estimate high confidence.

Comparable Properties (5)

3814 SANDY BROOK DR, ROUND ROCK, TX 78665
0.01 mi 100% similar Same subdivision
3 bed 2 bath 1,868 sqft Built 2006
Raw Value $326,735
Adjusted Value $383,984

Adjusted +$61,360 for 265 sqft more living space and -$4,111 for being older. Net adjustment: +$57,249.

3818 SANDY BROOK DR, ROUND ROCK, TX 78665
0.02 mi 100% similar Same subdivision
3 bed 2 bath 1,847 sqft Built 2007
Raw Value $325,180
Adjusted Value $391,402

Adjusted +$66,222 for 286 sqft more living space. Net adjustment: +$66,222.

3822 SANDY BROOK DR, ROUND ROCK, TX 78665
0.02 mi 100% similar Same subdivision
3 bed 2 bath 1,966 sqft Built 2006
Raw Value $304,077
Adjusted Value $338,634

Adjusted +$38,668 for 167 sqft more living space and -$4,111 for being older. Net adjustment: +$34,557.

3927 BONNIE LN, ROUND ROCK, TX 78665
0.02 mi 100% similar Same subdivision
4 bed 2 bath 1,964 sqft Built 2003
Raw Value $471,948
Adjusted Value $494,634

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

3925 BONNIE LN, ROUND ROCK, TX 78665
0.02 mi 100% similar Same subdivision
3 bed 2 bath 1,577 sqft Built 2003
Raw Value $331,519
Adjusted Value $443,814

Adjusted +$128,740 for 556 sqft more living space and -$16,445 for being older. Net adjustment: +$112,295.

The Neighborhood

This home is valued 4.7% 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
$312,522
Median
$328,056

This home is -4.7% below the subdivision median.

Tax Analysis

The estimated annual property tax is $5,623 across all districts. With a homestead exemption claimed, that drops to $4,315 — saving $1,308 per year. That's $360 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%$2,791
Round RockCity0.3720%$1,163
Williamson CountyCounty0.3694%$1,155
Austin Community Collegespecial0.1034%$323
Williamson County FM/RdCounty0.0443%$139
Upper Brushy Creek WCIDWater0.0170%$53
Williamson Central Appraisal Districtcad0.0000%$0
Total Annual Tax1.7993%$5,623

Mortgage Context

At today's 30-year mortgage rate of 6.38%, a buyer financing $391,402 would pay approximately $2,443 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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