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

4005 CASTLE CREEK, ROUND ROCK, TX 78681

ROUND ROCK, 78681 — williamson County

4 bed3 bath1,824 sqftBuilt 1999

Property at a Glance

This home is estimated between $482,822 and $765,016, with a best estimate of $652,389. That places the property above the L494500D - Vista Oaks Sec 5B Ph 2 & SEC 5C median of $449,628, in a neighborhood that declined 2.9% over the past year.

Estimated Value Range

$482,822 $765,016
Best Estimate
$652,389
WCAD Value
$624,952
Low Confidence

Based on 5 comparable properties(0 in the same subdivision)

There are 5 comparable properties within range, but none are in L494500D - Vista Oaks Sec 5B Ph 2 & SEC 5C. The estimated range of $482,822 and $765,016 should be treated as a rough guide.

Comparable Properties (5)

4 bed 3 bath 2,154 sqft Built 2001
Raw Value $860,722
Adjusted Value $760,704

Adjusted -$92,913 for 330 sqft less living space and -$7,105 for being older. Net adjustment: -$100,018.

4 bed 3 bath 1,811 sqft Built 2014
Raw Value $702,015
Adjusted Value $652,389

Adjusted +$3,660 for 13 sqft more living space and -$53,286 for being older. Net adjustment: -$49,626.

4 bed 3 bath 1,916 sqft Built 2014
Raw Value $562,011
Adjusted Value $482,822

Adjusted -$25,903 for 92 sqft less living space and -$53,286 for being older. Net adjustment: -$79,189.

4 bed 3 bath 1,916 sqft Built 2016
Raw Value $578,786
Adjusted Value $492,493

Adjusted -$25,903 for 92 sqft less living space and -$60,390 for being older. Net adjustment: -$86,293.

4 bed 3 bath 2,219 sqft Built 2007
Raw Value $904,649
Adjusted Value $765,016

Adjusted -$111,214 for 395 sqft less living space and -$28,419 for being older. Net adjustment: -$139,633.

The Neighborhood

This home is valued 39.0% above the L494500D - Vista Oaks Sec 5B Ph 2 & SEC 5C median of $449,628. With 904 homes in the subdivision, the property sits in the upper tier. Note that values in this subdivision declined 2.9% over the past year.

L494500D - Vista Oaks Sec 5B Ph 2 & SEC 5C

above average
904 Properties
$449,628 Median Value
-2.9% YoY Change
1% Have Pool
99% Have Garage
This Home
$624,952
Median
$449,628

This home is +39.0% above the subdivision median.

Tax Analysis

The estimated annual property tax is $12,087 across all districts. With a homestead exemption claimed, that drops to $10,450 — saving $1,637 per year. That's $871 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
Leander ISDSchool1.0869%$6,793
Williamson CountyCounty0.3694%$2,309
Vista Oaks MUDMUD0.2131%$1,332
Austin Community Collegespecial0.1034%$646
Williamson County ESD #9 - Round RockESD0.0999%$624
Williamson County FM/RdCounty0.0443%$277
Upper Brushy Creek WCIDWater0.0170%$106
Williamson Central Appraisal Districtcad0.0000%$0
Total Annual Tax1.9341%$12,087

Mortgage Context

At today's 30-year mortgage rate of 6.38%, a buyer financing $652,389 would pay approximately $4,072 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