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3518 AQUAMARINE DR, ROUND ROCK, TX 78681

ROUND ROCK, 78681 — williamson County

4 bed4 bath2,526 sqftBuilt 2008

Property at a Glance

This home is estimated between $893,424 and $1,253,426, with a best estimate of $937,989. That places the property above the R147606C - WALSH RANCH median of $933,667, in a neighborhood that declined 4.6% over the past year.

Estimated Value Range

$893,424 $1,253,426
Best Estimate
$937,989
WCAD Value
$1,017,895
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 $893,424 and $1,253,426 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 $1,015,588

Adjusted +$124,834 for 307 sqft more living space and -$13,895 for being older. Net adjustment: +$110,939.

5 bed 5 bath 2,711 sqft Built 2016
Raw Value $1,217,491
Adjusted Value $1,253,426

Adjusted -$75,226 for 185 sqft less living space and +$111,161 for being newer. Net adjustment: +$35,935.

4 bed 3 bath 2,154 sqft Built 2001
Raw Value $860,722
Adjusted Value $914,721

Adjusted +$151,265 for 372 sqft more living space and -$97,266 for being older. Net adjustment: +$53,999.

4 bed 3 bath 1,916 sqft Built 2014
Raw Value $562,011
Adjusted Value $893,424

Adjusted +$248,042 for 610 sqft more living space and +$83,371 for being newer. Net adjustment: +$331,413.

4 bed 3 bath 1,916 sqft Built 2016
Raw Value $578,786
Adjusted Value $937,989

Adjusted +$248,042 for 610 sqft more living space and +$111,161 for being newer. Net adjustment: +$359,203.

The Neighborhood

This home is valued 9.0% 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
$1,017,895
Median
$933,667

This home is +9.0% above the subdivision median.

Tax Analysis

The estimated annual property tax is $18,243 across all districts. With a homestead exemption claimed, that drops to $16,813 — saving $1,430 per year. That's $1,401 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%$8,700
Williamson CountyCounty0.3694%$3,599
Walsh Ranch MUDMUD0.3455%$3,366
Austin Community Collegespecial0.1034%$1,007
Williamson County ESD #2 - Sam Bass VFDESD0.1000%$974
Williamson County FM/RdCounty0.0443%$432
Upper Brushy Creek WCIDWater0.0170%$166
Williamson Central Appraisal Districtcad0.0000%$0
Total Annual Tax1.8728%$18,243

Mortgage Context

At today's 30-year mortgage rate of 6.38%, a buyer financing $937,989 would pay approximately $5,855 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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