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3115 CARNOUSTY ST, ROUND ROCK, TX 78664

ROUND ROCK, 78664 — williamson County

5 bed5 bath3,145 sqftBuilt 2004

Property at a Glance

This home is estimated between $854,259 and $1,179,072, with a best estimate of $1,057,355. That places the property above the R549699C - Forest Creek Sec 14,20,21,26-30,33,34 median of $910,927, in a neighborhood that declined 3.1% over the past year.

Estimated Value Range

$854,259 $1,179,072
Best Estimate
$1,057,355
WCAD Value
$1,099,173
High Confidence

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

Based on 5 comparable properties in R549699C - Forest Creek Sec 14,20,21,26-30,33,34, this home's estimated market value is between $854,259 and $1,179,072. All 5 comparables are in the same subdivision, giving this estimate high confidence.

Comparable Properties (5)

3605 CARNOUSTY CV, ROUND ROCK, TX 78664
0.00 mi 100% similar Same subdivision
5 bed 4 bath 2,526 sqft Built 2001
Raw Value $905,900
Adjusted Value $1,118,070

Adjusted +$216,557 for 619 sqft more living space and -$4,387 for being older. Net adjustment: +$212,170.

3116 CARNOUSTY ST, ROUND ROCK, TX 78664
0.00 mi 100% similar Same subdivision
4 bed 3 bath 3,350 sqft Built 2005
Raw Value $924,516
Adjusted Value $854,259

Adjusted -$71,719 for 205 sqft less living space and +$1,462 for being newer. Net adjustment: -$70,257.

3104 CARNOUSTY ST, ROUND ROCK, TX 78664
0.00 mi 100% similar Same subdivision
5 bed 4 bath 2,515 sqft Built 2001
Raw Value $841,337
Adjusted Value $1,057,355

Adjusted +$220,405 for 630 sqft more living space and -$4,387 for being older. Net adjustment: +$216,018.

3114 CARNOUSTY ST, ROUND ROCK, TX 78664
0.00 mi 100% similar Same subdivision
4 bed 3 bath 2,899 sqft Built 2005
Raw Value $874,085
Adjusted Value $961,610

Adjusted +$86,063 for 246 sqft more living space and +$1,462 for being newer. Net adjustment: +$87,525.

3118 CARNOUSTY ST, ROUND ROCK, TX 78664
0.00 mi 100% similar Same subdivision
5 bed 4 bath 2,438 sqft Built 2014
Raw Value $917,104
Adjusted Value $1,179,072

Adjusted +$247,344 for 707 sqft more living space and +$14,624 for being newer. Net adjustment: +$261,968.

The Neighborhood

This home is valued 20.7% above the R549699C - Forest Creek Sec 14,20,21,26-30,33,34 median of $910,927. With 271 homes in the subdivision, the property sits in the upper tier. Note that values in this subdivision declined 3.1% over the past year.

R549699C - Forest Creek Sec 14,20,21,26-30,33,34

above average
271 Properties
$910,927 Median Value
-3.1% YoY Change
1% Have Pool
99% Have Garage
This Home
$1,099,173
Median
$910,927

This home is +20.7% above the subdivision median.

Tax Analysis

The estimated annual property tax is $19,777 across all districts. With a homestead exemption claimed, that drops to $18,324 — saving $1,453 per year. That's $1,527 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%$9,817
Round RockCity0.3720%$4,089
Williamson CountyCounty0.3694%$4,061
Austin Community Collegespecial0.1034%$1,137
Williamson County FM/RdCounty0.0443%$487
Upper Brushy Creek WCIDWater0.0170%$187
Williamson Central Appraisal Districtcad0.0000%$0
Total Annual Tax1.7993%$19,777

Mortgage Context

At today's 30-year mortgage rate of 6.38%, a buyer financing $1,057,355 would pay approximately $6,600 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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