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100 NAUTICAL CIR, ROUND ROCK, TX 78681

ROUND ROCK, 78681 — williamson County

5 bed4 bath3,357 sqftBuilt 2015

Property at a Glance

This home is estimated between $705,365 and $1,386,954, with a best estimate of $1,231,046. That places the property below the R304615B - HIGHLAND HORIZON PH3 median of $1,296,229, in a neighborhood that declined 3.4% over the past year.

Estimated Value Range

$705,365 $1,386,954
Best Estimate
$1,231,046
WCAD Value
$1,388,582
Low Confidence

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

There are 5 comparable properties within range, but none are in R304615B - HIGHLAND HORIZON PH3. The estimated range of $705,365 and $1,386,954 should be treated as a rough guide.

Comparable Properties (5)

4 bed 3 bath 3,212 sqft Built 2013
Raw Value $1,086,731
Adjusted Value $1,149,291

Adjusted +$62,560 for 145 sqft more living space. Net adjustment: +$62,560.

4 bed 3 bath 2,249 sqft Built 2014
Raw Value $752,999
Adjusted Value $1,231,046

Adjusted +$478,047 for 1,108 sqft more living space. Net adjustment: +$478,047.

4 bed 2 bath 2,988 sqft Built 1999
Raw Value $546,160
Adjusted Value $705,365

Adjusted +$159,205 for 369 sqft more living space. Net adjustment: +$159,205.

4 bed 3 bath 1,833 sqft Built 2015
Raw Value $699,601
Adjusted Value $1,357,131

Adjusted +$657,530 for 1,524 sqft more living space. Net adjustment: +$657,530.

4 bed 3 bath 1,793 sqft Built 2014
Raw Value $712,166
Adjusted Value $1,386,954

Adjusted +$674,788 for 1,564 sqft more living space. Net adjustment: +$674,788.

The Neighborhood

This home is valued 7.1% above the R304615B - HIGHLAND HORIZON PH3 median of $1,296,229. With 27 homes in the subdivision, the property sits in the upper tier. Note that values in this subdivision declined 3.4% over the past year.

R304615B - HIGHLAND HORIZON PH3

typical
27 Properties
$1,296,229 Median Value
-3.4% YoY Change
0% Have Pool
100% Have Garage
This Home
$1,388,582
Median
$1,296,229

This home is +7.1% above the subdivision median.

Tax Analysis

The estimated annual property tax is $27,829 across all districts. With a homestead exemption claimed, that drops to $26,322 — saving $1,507 per year. That's $2,194 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%$12,401
Brushy Creek MUDMUD0.3868%$5,372
Williamson CountyCounty0.3694%$5,130
Austin Community Collegespecial0.1034%$1,436
Williamson County ESD #2 - Sam Bass VFDESD0.1000%$1,389
Brushy Creek MUD Defined AreaMUD0.0900%$1,250
Williamson County FM/RdCounty0.0443%$616
Upper Brushy Creek WCIDWater0.0170%$236
Williamson Central Appraisal Districtcad0.0000%$0
Total Annual Tax2.0041%$27,829

Mortgage Context

At today's 30-year mortgage rate of 6.38%, a buyer financing $1,231,046 would pay approximately $7,684 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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