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

3513 SANDY BROOK DR, ROUND ROCK, TX 78665

ROUND ROCK, 78665 — williamson County

3 bed2 bath963 sqftBuilt 2002

Property at a Glance

This home is estimated between $87,345 and $289,733, with a best estimate of $275,231. That places the property below the R402401F - Lakeside Sub Sec 1 median of $311,433, in a neighborhood that declined 11.3% over the past year.

Estimated Value Range

$87,345 $289,733
Best Estimate
$275,231
WCAD Value
$311,097
High Confidence

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

Based on 5 comparable properties in R402401F - Lakeside Sub Sec 1, this home's estimated market value is between $87,345 and $289,733. All 5 comparables are in the same subdivision, giving this estimate high confidence.

Comparable Properties (5)

3515 SANDY BROOK DR, ROUND ROCK, TX 78665
0.01 mi 100% similar Same subdivision
3 bed 2 bath 1,239 sqft Built 2002
Raw Value $367,684
Adjusted Value $286,307

Adjusted -$81,377 for 276 sqft less living space. Net adjustment: -$81,377.

3511 SANDY BROOK DR, ROUND ROCK, TX 78665
0.01 mi 100% similar Same subdivision
3 bed 2 bath 1,622 sqft Built 2002
Raw Value $281,647
Adjusted Value $87,345

Adjusted -$194,302 for 659 sqft less living space. Net adjustment: -$194,302.

3517 SANDY BROOK DR, ROUND ROCK, TX 78665
0.02 mi 100% similar Same subdivision
3 bed 2 bath 1,592 sqft Built 2003
Raw Value $277,988
Adjusted Value $88,765

Adjusted -$185,456 for 629 sqft less living space and -$3,767 for being older. Net adjustment: -$189,223.

1718 AMISTAD WAY, ROUND ROCK, TX 78665
0.02 mi 100% similar Same subdivision
3 bed 2 bath 1,244 sqft Built 2003
Raw Value $376,351
Adjusted Value $289,733

Adjusted -$82,851 for 281 sqft less living space and -$3,767 for being older. Net adjustment: -$86,618.

1720 AMISTAD WAY, ROUND ROCK, TX 78665
0.03 mi 100% similar Same subdivision
3 bed 2 bath 1,263 sqft Built 2002
Raw Value $363,684
Adjusted Value $275,231

Adjusted -$88,453 for 300 sqft less living space. Net adjustment: -$88,453.

The Neighborhood

This home is in line with the R402401F - Lakeside Sub Sec 1 median of $311,433. Note that values in this subdivision declined 11.3% over the past year.

R402401F - Lakeside Sub Sec 1

typical
135 Properties
$311,433 Median Value
-11.3% YoY Change
1% Have Pool
100% Have Garage
This Home
$311,097
Median
$311,433

This home is -0.1% below the subdivision median.

Tax Analysis

The estimated annual property tax is $5,597 across all districts. With a homestead exemption claimed, that drops to $4,290 — saving $1,307 per year. That's $358 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%$2,778
Round RockCity0.3720%$1,157
Williamson CountyCounty0.3694%$1,149
Austin Community Collegespecial0.1034%$322
Williamson County FM/RdCounty0.0443%$138
Upper Brushy Creek WCIDWater0.0170%$53
Williamson Central Appraisal Districtcad0.0000%$0
Total Annual Tax1.7993%$5,597

Mortgage Context

At today's 30-year mortgage rate of 6.38%, a buyer financing $275,231 would pay approximately $1,718 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