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

3624 SANDY BROOK DR, ROUND ROCK, TX 78665

ROUND ROCK, 78665 — williamson County

4 bed2 bath1,611 sqftBuilt 2007

Property at a Glance

This home is estimated between $283,448 and $445,196, with a best estimate of $323,450. 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

$283,448 $445,196
Best Estimate
$323,450
WCAD Value
$408,657
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 $283,448 and $445,196. All 5 comparables are in the same subdivision, giving this estimate high confidence.

Comparable Properties (5)

3628 SANDY BROOK DR, ROUND ROCK, TX 78665
0.01 mi 100% similar Same subdivision
3 bed 2 bath 1,500 sqft Built 2009
Raw Value $289,525
Adjusted Value $323,450

Adjusted +$25,702 for 111 sqft more living space and +$8,223 for being newer. Net adjustment: +$33,925.

3620 SANDY BROOK DR, ROUND ROCK, TX 78665
0.01 mi 100% similar Same subdivision
3 bed 2 bath 1,717 sqft Built 2007
Raw Value $315,636
Adjusted Value $291,092

Adjusted -$24,544 for 106 sqft less living space. Net adjustment: -$24,544.

3632 SANDY BROOK DR, ROUND ROCK, TX 78665
0.02 mi 100% similar Same subdivision
4 bed 2 bath 1,280 sqft Built 2006
Raw Value $372,665
Adjusted Value $445,196

Adjusted +$76,642 for 331 sqft more living space and -$4,111 for being older. Net adjustment: +$72,531.

1539 HAYNIE BND, ROUND ROCK, TX 78665
0.02 mi 100% similar Same subdivision
3 bed 2 bath 1,725 sqft Built 2007
Raw Value $309,844
Adjusted Value $283,448

Adjusted -$26,396 for 114 sqft less living space. Net adjustment: -$26,396.

3616 SANDY BROOK DR, ROUND ROCK, TX 78665
0.02 mi 100% similar Same subdivision
3 bed 2 bath 1,482 sqft Built 2009
Raw Value $288,083
Adjusted Value $326,175

Adjusted +$29,869 for 129 sqft more living space and +$8,223 for being newer. Net adjustment: +$38,092.

The Neighborhood

This home is valued 24.6% 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
$408,657
Median
$328,056

This home is +24.6% above the subdivision median.

Tax Analysis

The estimated annual property tax is $7,353 across all districts. With a homestead exemption claimed, that drops to $6,027 — saving $1,326 per year. That's $502 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%$3,650
Round RockCity0.3720%$1,520
Williamson CountyCounty0.3694%$1,510
Austin Community Collegespecial0.1034%$423
Williamson County FM/RdCounty0.0443%$181
Upper Brushy Creek WCIDWater0.0170%$69
Williamson Central Appraisal Districtcad0.0000%$0
Total Annual Tax1.7993%$7,353

Mortgage Context

At today's 30-year mortgage rate of 6.38%, a buyer financing $323,450 would pay approximately $2,019 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