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

100 WATER OAK CV, ROUND ROCK, TX 78664

ROUND ROCK, 78664 — williamson County

4 bed3 bath2,795 sqftBuilt 2005

Property at a Glance

This home is estimated between $564,903 and $917,451, with a best estimate of $740,137. That places the property above the R651598E - MORNINGSIDE MEADOWS SEC 1&7, K & B median of $400,408, in a neighborhood that declined 3.0% over the past year.

Estimated Value Range

$564,903 $917,451
Best Estimate
$740,137
WCAD Value
$720,249
Low Confidence

Based on 5 comparable properties(2 in the same subdivision)

There are 5 comparable properties within range, but few are in R651598E - MORNINGSIDE MEADOWS SEC 1&7, K & B. The estimated range of $564,903 and $917,451 should be treated as a rough guide.

Comparable Properties (5)

104 WATER OAK CV, ROUND ROCK, TX 78664
0.00 mi 100% similar Same subdivision
4 bed 3 bath 2,785 sqft Built 2005
Raw Value $738,284
Adjusted Value $740,137

Adjusted +$1,853 for 10 sqft more living space. Net adjustment: +$1,853.

109 WATER OAK CV, ROUND ROCK, TX 78664
0.00 mi 100% similar Same subdivision
3 bed 2 bath 2,369 sqft Built 2004
Raw Value $666,634
Adjusted Value $752,454

Adjusted +$78,952 for 426 sqft more living space and +$6,868 for being newer. Net adjustment: +$85,820.

4 bed 3 bath 2,442 sqft Built 1984
Raw Value $707,791
Adjusted Value $917,451

Adjusted +$65,423 for 353 sqft more living space and +$144,237 for being newer. Net adjustment: +$209,660.

3 bed 2 bath 2,282 sqft Built 2000
Raw Value $492,687
Adjusted Value $622,105

Adjusted +$95,076 for 513 sqft more living space and +$34,342 for being newer. Net adjustment: +$129,418.

4 bed 2 bath 1,939 sqft Built 1997
Raw Value $351,311
Adjusted Value $564,903

Adjusted +$158,645 for 856 sqft more living space and +$54,947 for being newer. Net adjustment: +$213,592.

The Neighborhood

This home is valued 79.9% above the R651598E - MORNINGSIDE MEADOWS SEC 1&7, K & B median of $400,408. With 270 homes in the subdivision, the property sits in the upper tier. Note that values in this subdivision declined 3.0% over the past year.

R651598E - MORNINGSIDE MEADOWS SEC 1&7, K & B

outlier high
270 Properties
$400,408 Median Value
-3.0% YoY Change
3% Have Pool
99% Have Garage
This Home
$720,249
Median
$400,408

This home is +79.9% above the subdivision median.

Tax Analysis

The estimated annual property tax is $10,088 across all districts. With a homestead exemption claimed, that drops to $8,715 — saving $1,373 per year. That's $726 per month a buyer should budget. The assessed value increased +19.9% vs the subdivision average of -3.0%. This above-average increase gives a protest opportunity score of 95 out of 100 — it may be worth challenging the appraisal.

Tax Districts

DistrictTypeRateAnnual Amount
Round Rock ISDSchool0.8931%$5,899
Williamson CountyCounty0.3694%$2,440
Austin Community Collegespecial0.1034%$683
Williamson County ESD #9 - Round RockESD0.0999%$660
Williamson County FM/RdCounty0.0443%$293
Upper Brushy Creek WCIDWater0.0170%$112
Williamson Central Appraisal Districtcad0.0000%$0
Total Annual Tax1.5272%$10,088
95 / 100

There may be a strong case to protest this appraisal.

Mortgage Context

At today's 30-year mortgage rate of 6.38%, a buyer financing $740,137 would pay approximately $4,620 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