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

1511 TONIA LOOP, ROUND ROCK, TX 78665

ROUND ROCK, 78665 — williamson County

4 bed2 bath1,624 sqftBuilt 2006

Property at a Glance

This home is estimated between $224,888 and $503,099, with a best estimate of $295,143. That places the property below the R409599G - STONEY BROOK - ALL SECTIONS median of $328,056, in a neighborhood that declined 4.7% over the past year.

Estimated Value Range

$224,888 $503,099
Best Estimate
$295,143
WCAD Value
$425,852
Medium Confidence

Based on 5 comparable properties(3 in the same subdivision)

Based on 5 comparable properties (3 in the same subdivision, 2 nearby), the estimated range is $224,888 and $503,099. More comparables in the same subdivision would strengthen this estimate.

Comparable Properties (5)

4 bed 2 bath 1,636 sqft Built 1999
Raw Value $534,657
Adjusted Value $503,099

Adjusted -$2,779 for 12 sqft less living space and -$28,779 for being older. Net adjustment: -$31,558.

4 bed 2 bath 1,800 sqft Built 2006
Raw Value $462,975
Adjusted Value $422,223

Adjusted -$40,752 for 176 sqft less living space. Net adjustment: -$40,752.

1517 TONIA LOOP, ROUND ROCK, TX 78665
0.01 mi 100% similar Same subdivision
3 bed 2 bath 1,596 sqft Built 2006
Raw Value $288,660
Adjusted Value $295,143

Adjusted +$6,483 for 28 sqft more living space. Net adjustment: +$6,483.

1521 TONIA LOOP, ROUND ROCK, TX 78665
0.02 mi 100% similar Same subdivision
3 bed 2 bath 1,868 sqft Built 2006
Raw Value $332,591
Adjusted Value $276,094

Adjusted -$56,497 for 244 sqft less living space. Net adjustment: -$56,497.

3822 SANDY BROOK DR, ROUND ROCK, TX 78665
0.03 mi 100% similar Same subdivision
3 bed 2 bath 1,966 sqft Built 2006
Raw Value $304,077
Adjusted Value $224,888

Adjusted -$79,189 for 342 sqft less living space. Net adjustment: -$79,189.

The Neighborhood

This home is valued 29.8% 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
$425,852
Median
$328,056

This home is +29.8% above the subdivision median.

Tax Analysis

The estimated annual property tax is $7,662 across all districts. With a homestead exemption claimed, that drops to $6,333 — saving $1,329 per year. That's $528 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%$3,803
Round RockCity0.3720%$1,584
Williamson CountyCounty0.3694%$1,573
Austin Community Collegespecial0.1034%$440
Williamson County FM/RdCounty0.0443%$189
Upper Brushy Creek WCIDWater0.0170%$72
Williamson Central Appraisal Districtcad0.0000%$0
Total Annual Tax1.7993%$7,662

Mortgage Context

At today's 30-year mortgage rate of 6.38%, a buyer financing $295,143 would pay approximately $1,842 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