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18 COUNTRY DR, ROUND ROCK, TX 78664

ROUND ROCK, 78664 — williamson County

4 bed3 bath1,941 sqftBuilt 1982

Property at a Glance

This home is estimated between $325,737 and $851,950, with a best estimate of $510,789. That places the property below the R575583D - RR Rual Sub 122 & Gattis School Rd Area median of $734,399, in a neighborhood that appreciated 3.8% over the past year.

Estimated Value Range

$325,737 $851,950
Best Estimate
$510,789
WCAD Value
$768,072
Low Confidence

Based on 5 comparable properties(1 in the same subdivision)

There are 5 comparable properties within range, but few are in R575583D - RR Rual Sub 122 & Gattis School Rd Area. The estimated range of $325,737 and $851,950 should be treated as a rough guide.

Comparable Properties (5)

27 COUNTRY DR, ROUND ROCK, TX 78664
0.00 mi 88% similar Same subdivision
4 bed 2 bath 1,570 sqft Built 1983
Raw Value $732,536
Adjusted Value $851,950

Adjusted +$119,401 for 371 sqft more living space and +$13 for being newer. Net adjustment: +$119,414.

4 bed 3 bath 1,819 sqft Built 1993
Raw Value $805,417
Adjusted Value $844,819

Adjusted +$39,264 for 122 sqft more living space and +$138 for being newer. Net adjustment: +$39,402.

3 bed 2 bath 1,934 sqft Built 1986
Raw Value $508,486
Adjusted Value $510,789

Adjusted +$2,253 for 7 sqft more living space and +$50 for being newer. Net adjustment: +$2,303.

3 bed 2 bath 2,056 sqft Built 1985
Raw Value $362,710
Adjusted Value $325,737

Adjusted -$37,011 for 115 sqft less living space and +$38 for being newer. Net adjustment: -$36,973.

4 bed 4 bath 2,292 sqft Built 1997
Raw Value $456,372
Adjusted Value $343,597

Adjusted -$112,964 for 351 sqft less living space and +$189 for being newer. Net adjustment: -$112,775.

The Neighborhood

This home is valued 4.6% above the R575583D - RR Rual Sub 122 & Gattis School Rd Area median of $734,399. With 213 homes in the subdivision, the property sits in the upper tier. The neighborhood appreciated 3.8% over the past year.

R575583D - RR Rual Sub 122 & Gattis School Rd Area

typical
213 Properties
$734,399 Median Value
+3.8% YoY Change
4% Have Pool
68% Have Garage
This Home
$768,072
Median
$734,399

This home is +4.6% above the subdivision median.

Tax Analysis

The estimated annual property tax is $11,413 across all districts. With a homestead exemption claimed, that drops to $10,025 — saving $1,388 per year. That's $835 per month a buyer should budget. The assessed value increased +13.1% vs the subdivision average of +3.8%. This above-average increase gives a protest opportunity score of 77 out of 100 — it may be worth challenging the appraisal.

Tax Districts

DistrictTypeRateAnnual Amount
Round Rock ISDSchool0.8931%$6,674
Williamson CountyCounty0.3694%$2,761
Austin Community Collegespecial0.1034%$773
Williamson County ESD #9 - Round RockESD0.0999%$747
Williamson County FM/RdCounty0.0443%$331
Upper Brushy Creek WCIDWater0.0170%$127
Williamson Central Appraisal Districtcad0.0000%$0
Total Annual Tax1.5272%$11,413
77 / 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 $510,789 would pay approximately $3,188 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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