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3636 AQUAMARINE DR, ROUND ROCK, TX 78681

ROUND ROCK, 78681 — williamson County

5 bed4 bath2,267 sqftBuilt 2009

Property at a Glance

This home is estimated between $774,213 and $1,134,215, with a best estimate of $818,778. That places the property below the R147606C - WALSH RANCH median of $933,667, in a neighborhood that declined 4.6% over the past year.

Estimated Value Range

$774,213 $1,134,215
Best Estimate
$818,778
WCAD Value
$991,770
Low Confidence

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

There are 5 comparable properties within range, but few are in R147606C - WALSH RANCH. The estimated range of $774,213 and $1,134,215 should be treated as a rough guide.

Comparable Properties (5)

3323 MARCASITE DR, ROUND ROCK, TX 78681
0.00 mi 100% similar Same subdivision
4 bed 3 bath 2,219 sqft Built 2007
Raw Value $904,649
Adjusted Value $896,377

Adjusted +$19,518 for 48 sqft more living space and -$27,790 for being older. Net adjustment: -$8,272.

5 bed 5 bath 2,711 sqft Built 2016
Raw Value $1,217,491
Adjusted Value $1,134,215

Adjusted -$180,542 for 444 sqft less living space and +$97,266 for being newer. Net adjustment: -$83,276.

4 bed 3 bath 2,154 sqft Built 2001
Raw Value $860,722
Adjusted Value $795,510

Adjusted +$45,949 for 113 sqft more living space and -$111,161 for being older. Net adjustment: -$65,212.

4 bed 3 bath 1,916 sqft Built 2014
Raw Value $562,011
Adjusted Value $774,213

Adjusted +$142,726 for 351 sqft more living space and +$69,476 for being newer. Net adjustment: +$212,202.

4 bed 3 bath 1,916 sqft Built 2016
Raw Value $578,786
Adjusted Value $818,778

Adjusted +$142,726 for 351 sqft more living space and +$97,266 for being newer. Net adjustment: +$239,992.

The Neighborhood

This home is valued 6.2% above the R147606C - WALSH RANCH median of $933,667. With 239 homes in the subdivision, the property sits in the upper tier. Note that values in this subdivision declined 4.6% over the past year.

R147606C - WALSH RANCH

typical
239 Properties
$933,667 Median Value
-4.6% YoY Change
0% Have Pool
100% Have Garage
This Home
$991,770
Median
$933,667

This home is +6.2% above the subdivision median.

Tax Analysis

The estimated annual property tax is $17,915 across all districts. With a homestead exemption claimed, that drops to $16,488 — saving $1,427 per year. That's $1,374 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%$8,543
Williamson CountyCounty0.3694%$3,534
Walsh Ranch MUDMUD0.3455%$3,305
Austin Community Collegespecial0.1034%$989
Williamson County ESD #2 - Sam Bass VFDESD0.1000%$957
Williamson County FM/RdCounty0.0443%$424
Upper Brushy Creek WCIDWater0.0170%$163
Williamson Central Appraisal Districtcad0.0000%$0
Total Annual Tax1.8728%$17,915

Mortgage Context

At today's 30-year mortgage rate of 6.38%, a buyer financing $818,778 would pay approximately $5,111 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 4/19/2026.

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