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4003 CASTLE CREEK, ROUND ROCK, TX 78681

ROUND ROCK, 78681 — williamson County

4 bed3 bath1,768 sqftBuilt 1999

Property at a Glance

This home is estimated between $467,055 and $749,249, with a best estimate of $636,622. 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

$467,055 $749,249
Best Estimate
$636,622
WCAD Value
$665,503
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 $467,055 and $749,249 should be treated as a rough guide.

Comparable Properties (5)

4 bed 3 bath 1,811 sqft Built 2014
Raw Value $702,015
Adjusted Value $636,622

Adjusted -$12,107 for 43 sqft less living space and -$53,286 for being older. Net adjustment: -$65,393.

4 bed 3 bath 2,154 sqft Built 2001
Raw Value $860,722
Adjusted Value $744,937

Adjusted -$108,680 for 386 sqft less living space and -$7,105 for being older. Net adjustment: -$115,785.

4 bed 3 bath 1,916 sqft Built 2014
Raw Value $562,011
Adjusted Value $467,055

Adjusted -$41,670 for 148 sqft less living space and -$53,286 for being older. Net adjustment: -$94,956.

4 bed 3 bath 1,916 sqft Built 2016
Raw Value $578,786
Adjusted Value $476,726

Adjusted -$41,670 for 148 sqft less living space and -$60,390 for being older. Net adjustment: -$102,060.

4 bed 3 bath 2,219 sqft Built 2007
Raw Value $904,649
Adjusted Value $749,249

Adjusted -$126,981 for 451 sqft less living space and -$28,419 for being older. Net adjustment: -$155,400.

The Neighborhood

This home is valued 48.0% 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
$665,503
Median
$449,628

This home is +48.0% above the subdivision median.

Tax Analysis

The estimated annual property tax is $12,871 across all districts. With a homestead exemption claimed, that drops to $11,227 — saving $1,644 per year. That's $936 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%$7,233
Williamson CountyCounty0.3694%$2,459
Vista Oaks MUDMUD0.2131%$1,418
Austin Community Collegespecial0.1034%$688
Williamson County ESD #9 - Round RockESD0.0999%$665
Williamson County FM/RdCounty0.0443%$295
Upper Brushy Creek WCIDWater0.0170%$113
Williamson Central Appraisal Districtcad0.0000%$0
Total Annual Tax1.9341%$12,871

Mortgage Context

At today's 30-year mortgage rate of 6.38%, a buyer financing $636,622 would pay approximately $3,974 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.

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