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18 HIDDEN ACRES DR, ROUND ROCK, TX 78665

ROUND ROCK, 78665 — williamson County

4 bed2 bath1,828 sqftBuilt 1977

Property at a Glance

This home is estimated between $218,799 and $453,273, with a best estimate of $373,949. That places the property below the R427578G - Hidden Acres & Sec 2 median of $412,870, in a neighborhood that declined 4.2% over the past year.

Estimated Value Range

$218,799 $453,273
Best Estimate
$373,949
WCAD Value
$426,884
High Confidence

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

Based on 5 comparable properties in R427578G - Hidden Acres & Sec 2, this home's estimated market value is between $218,799 and $453,273. All 5 comparables are in the same subdivision, giving this estimate high confidence.

Comparable Properties (5)

12 HIDDEN ACRES DR, ROUND ROCK, TX 78665
0.00 mi 100% similar Same subdivision
4 bed 2 bath 1,411 sqft Built 1981
Raw Value $412,870
Adjusted Value $453,273

Adjusted +$88,682 for 417 sqft more living space and -$48,279 for being older. Net adjustment: +$40,403.

9 HIDDEN ACRES DR, ROUND ROCK, TX 78665
0.00 mi 100% similar Same subdivision
4 bed 2 bath 2,525 sqft Built 1977
Raw Value $420,900
Adjusted Value $272,671

Adjusted -$148,229 for 697 sqft less living space. Net adjustment: -$148,229.

16 HIDDEN ACRES DR, ROUND ROCK, TX 78665
0.00 mi 100% similar Same subdivision
3 bed 2 bath 1,485 sqft Built 1977
Raw Value $308,754
Adjusted Value $381,699

Adjusted +$72,945 for 343 sqft more living space. Net adjustment: +$72,945.

14 HIDDEN ACRES DR, ROUND ROCK, TX 78665
0.00 mi 100% similar Same subdivision
4 bed 2 bath 2,990 sqft Built 1977
Raw Value $465,918
Adjusted Value $218,799

Adjusted -$247,119 for 1,162 sqft less living space. Net adjustment: -$247,119.

11 HIDDEN ACRES DR, ROUND ROCK, TX 78665
0.00 mi 100% similar Same subdivision
3 bed 2 bath 1,477 sqft Built 1977
Raw Value $299,303
Adjusted Value $373,949

Adjusted +$74,646 for 351 sqft more living space. Net adjustment: +$74,646.

The Neighborhood

This home is valued 3.4% above the R427578G - Hidden Acres & Sec 2 median of $412,870. With 19 homes in the subdivision, the property sits in the upper tier. Note that values in this subdivision declined 4.2% over the past year.

R427578G - Hidden Acres & Sec 2

typical
19 Properties
$412,870 Median Value
-4.2% YoY Change
26% Have Pool
84% Have Garage
This Home
$426,884
Median
$412,870

This home is +3.4% above the subdivision median.

Tax Analysis

The estimated annual property tax is $6,519 across all districts. With a homestead exemption claimed, that drops to $5,190 — saving $1,329 per year. That's $433 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%$3,813
Williamson CountyCounty0.3694%$1,577
Austin Community Collegespecial0.1034%$441
Williamson County ESD #9 - Round RockESD0.0999%$427
Williamson County FM/RdCounty0.0443%$189
Upper Brushy Creek WCIDWater0.0170%$73
Williamson Central Appraisal Districtcad0.0000%$0
Total Annual Tax1.5272%$6,519

Mortgage Context

At today's 30-year mortgage rate of 6.38%, a buyer financing $373,949 would pay approximately $2,334 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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