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3729 CASTLE ROCK DR, ROUND ROCK, TX 78681

ROUND ROCK, 78681 — williamson County

3 bed2 bath940 sqftBuilt 2003

Property at a Glance

This home is estimated between $93,154 and $456,420, with a best estimate of $220,592. That places the property below the R107503F - PRESERVE AT STONE OAK - PH 3 & 4 median of $368,194, in a neighborhood that declined 10.9% over the past year.

Estimated Value Range

$93,154 $456,420
Best Estimate
$220,592
WCAD Value
$370,651
Low Confidence

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

There are 5 comparable properties within range, but none are in R107503F - PRESERVE AT STONE OAK - PH 3 & 4. The estimated range of $93,154 and $456,420 should be treated as a rough guide.

Comparable Properties (5)

3 bed 2 bath 940 sqft Built 2002
Raw Value $457,821
Adjusted Value $456,420

Adjusted -$1,401 for being older. Net adjustment: -$1,401.

3 bed 1,232 sqft Built 2011
Raw Value $141,391
Adjusted Value $93,154

Adjusted -$59,443 for 292 sqft less living space and +$11,206 for being newer. Net adjustment: -$48,237.

4 bed 2 bath 1,186 sqft Built 1994
Raw Value $407,186
Adjusted Value $344,500

Adjusted -$50,079 for 246 sqft less living space and -$12,607 for being older. Net adjustment: -$62,686.

3 bed 2 bath 1,133 sqft Built 1979
Raw Value $293,501
Adjusted Value $220,592

Adjusted -$39,290 for 193 sqft less living space and -$33,619 for being older. Net adjustment: -$72,909.

3 bed 2 bath 1,212 sqft Built 1982
Raw Value $268,403
Adjusted Value $183,615

Adjusted -$55,372 for 272 sqft less living space and -$29,416 for being older. Net adjustment: -$84,788.

The Neighborhood

This home is in line with the R107503F - PRESERVE AT STONE OAK - PH 3 & 4 median of $368,194. Note that values in this subdivision declined 10.9% over the past year.

R107503F - PRESERVE AT STONE OAK - PH 3 & 4

typical
1,045 Properties
$368,194 Median Value
-10.9% YoY Change
1% Have Pool
99% Have Garage
This Home
$370,651
Median
$368,194

This home is +0.7% above the subdivision median.

Tax Analysis

The estimated annual property tax is $6,669 across all districts. With a homestead exemption claimed, that drops to $5,350 — saving $1,319 per year. That's $446 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%$3,310
Round RockCity0.3720%$1,379
Williamson CountyCounty0.3694%$1,369
Austin Community Collegespecial0.1034%$383
Williamson County FM/RdCounty0.0443%$164
Upper Brushy Creek WCIDWater0.0170%$63
Williamson Central Appraisal Districtcad0.0000%$0
Total Annual Tax1.7993%$6,669

Mortgage Context

At today's 30-year mortgage rate of 6.38%, a buyer financing $220,592 would pay approximately $1,377 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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