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

21 BRENDA LN, ROUND ROCK, TX 78665

ROUND ROCK, 78665 — williamson County

3 bed2 bath2,410 sqftBuilt 1976

Property at a Glance

This home is estimated between $789,830 and $1,378,636, with a best estimate of $1,249,000. That places the property above the R451581F - Jackie Thomison Sub median of $825,132, in a neighborhood that declined 11.3% over the past year.

Estimated Value Range

$789,830 $1,378,636
Best Estimate
$1,249,000
WCAD Value
$811,150
High Confidence

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

Based on 5 comparable properties in R451581F - Jackie Thomison Sub, this home's estimated market value is between $789,830 and $1,378,636. All 5 comparables are in the same subdivision, giving this estimate high confidence.

Comparable Properties (5)

13 BRENDA LN, ROUND ROCK, TX 78665
0.00 mi 100% similar Same subdivision
3 bed 2 bath 2,430 sqft Built 1976
Raw Value $797,482
Adjusted Value $789,830

Adjusted -$7,652 for 20 sqft less living space. Net adjustment: -$7,652.

7 BRENDA LN, ROUND ROCK, TX 78665
0.00 mi 100% similar Same subdivision
3 bed 2 bath 2,136 sqft Built 1977
Raw Value $994,804
Adjusted Value $1,099,709

Adjusted +$104,829 for 274 sqft more living space and +$76 for being newer. Net adjustment: +$104,905.

16 BRENDA LN, ROUND ROCK, TX 78665
0.00 mi 100% similar Same subdivision
3 bed 2 bath 2,525 sqft Built 1996
Raw Value $1,421,118
Adjusted Value $1,378,636

Adjusted -$43,997 for 115 sqft less living space and +$1,515 for being newer. Net adjustment: -$42,482.

23 BRENDA LN, ROUND ROCK, TX 78665
0.00 mi 100% similar Same subdivision
3 bed 2 bath 2,440 sqft Built 1987
Raw Value $1,279,274
Adjusted Value $1,268,629

Adjusted -$11,478 for 30 sqft less living space and +$833 for being newer. Net adjustment: -$10,645.

12 BRENDA LN, ROUND ROCK, TX 78665
0.00 mi 100% similar Same subdivision
3 bed 2 bath 2,183 sqft Built 1977
Raw Value $1,162,077
Adjusted Value $1,249,000

Adjusted +$86,847 for 227 sqft more living space and +$76 for being newer. Net adjustment: +$86,923.

The Neighborhood

This home is valued 1.7% below the R451581F - Jackie Thomison Sub median of $825,132. That positions it competitively for buyers comparing within the neighborhood. Note that values in this subdivision declined 11.3% over the past year.

R451581F - Jackie Thomison Sub

typical
25 Properties
$825,132 Median Value
-11.3% YoY Change
0% Have Pool
52% Have Garage
This Home
$811,150
Median
$825,132

This home is -1.7% below the subdivision median.

Tax Analysis

The estimated annual property tax is $14,595 across all districts. With a homestead exemption claimed, that drops to $13,195 — saving $1,400 per year. That's $1,100 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%$7,244
Round RockCity0.3720%$3,017
Williamson CountyCounty0.3694%$2,997
Austin Community Collegespecial0.1034%$839
Williamson County FM/RdCounty0.0443%$360
Upper Brushy Creek WCIDWater0.0170%$138
Williamson Central Appraisal Districtcad0.0000%$0
Total Annual Tax1.7993%$14,595

Mortgage Context

At today's 30-year mortgage rate of 6.38%, a buyer financing $1,249,000 would pay approximately $7,796 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