Beta Williamson County, TX only — data and coverage are limited during early access.

3103 CARNOUSTY ST, ROUND ROCK, TX 78664

ROUND ROCK, 78664 — williamson County

3 bed2 bath3,282 sqftBuilt 2013

Property at a Glance

This home is estimated between $749,953 and $1,089,392, with a best estimate of $1,019,509. 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

$749,953 $1,089,392
Best Estimate
$1,019,509
WCAD Value
$760,122
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 $749,953 and $1,089,392. All 5 comparables are in the same subdivision, giving this estimate high confidence.

Comparable Properties (5)

3108 CARNOUSTY ST, ROUND ROCK, TX 78664
0.00 mi 100% similar Same subdivision
3 bed 2 bath 2,748 sqft Built 2013
Raw Value $832,689
Adjusted Value $1,019,509

Adjusted +$186,820 for 534 sqft more living space. Net adjustment: +$186,820.

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 $889,027

Adjusted -$23,790 for 68 sqft less living space and -$11,699 for being older. Net adjustment: -$35,489.

3110 CARNOUSTY ST, ROUND ROCK, TX 78664
0.00 mi 100% similar Same subdivision
4 bed 4 bath 3,577 sqft Built 2011
Raw Value $856,084
Adjusted Value $749,953

Adjusted -$103,206 for 295 sqft less living space and -$2,925 for being older. Net adjustment: -$106,131.

3614 CARNOUSTY CV, ROUND ROCK, TX 78664
0.00 mi 100% similar Same subdivision
4 bed 4 bath 3,452 sqft Built 2014
Raw Value $1,114,872
Adjusted Value $1,056,860

Adjusted -$59,474 for 170 sqft less living space and +$1,462 for being newer. Net adjustment: -$58,012.

3612 CARNOUSTY CV, ROUND ROCK, TX 78664
0.00 mi 100% similar Same subdivision
4 bed 3 bath 2,992 sqft Built 2008
Raw Value $995,248
Adjusted Value $1,089,392

Adjusted +$101,456 for 290 sqft more living space and -$7,312 for being older. Net adjustment: +$94,144.

The Neighborhood

This home is valued 16.6% below the R549699C - Forest Creek Sec 14,20,21,26-30,33,34 median of $910,927. That positions it competitively for buyers comparing within the neighborhood. Note that values in this subdivision declined 3.1% over the past year.

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

below average
271 Properties
$910,927 Median Value
-3.1% YoY Change
1% Have Pool
99% Have Garage
This Home
$760,122
Median
$910,927

This home is -16.6% below the subdivision median.

Tax Analysis

The estimated annual property tax is $13,677 across all districts. With a homestead exemption claimed, that drops to $12,286 — saving $1,391 per year. That's $1,024 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%$6,789
Round RockCity0.3720%$2,828
Williamson CountyCounty0.3694%$2,808
Austin Community Collegespecial0.1034%$786
Williamson County FM/RdCounty0.0443%$337
Upper Brushy Creek WCIDWater0.0170%$129
Williamson Central Appraisal Districtcad0.0000%$0
Total Annual Tax1.7993%$13,677

Mortgage Context

At today's 30-year mortgage rate of 6.38%, a buyer financing $1,019,509 would pay approximately $6,364 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.

View full property details