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

3105 DIEGO CV, ROUND ROCK, TX 78665

ROUND ROCK, 78665 — williamson County

4 bed3 bath1,714 sqftBuilt 2017

Property at a Glance

This home is estimated between $328,737 and $524,085, with a best estimate of $414,804. That places the property below the R491507D - PALOMA LAKE PLANTATION, GRANDHAVEN median of $499,831, in a neighborhood that declined 1.7% over the past year.

Estimated Value Range

$328,737 $524,085
Best Estimate
$414,804
WCAD Value
$529,358
Low Confidence

Based on 5 comparable properties(2 in the same subdivision)

There are 5 comparable properties within range, but few are in R491507D - PALOMA LAKE PLANTATION, GRANDHAVEN. The estimated range of $328,737 and $524,085 should be treated as a rough guide.

Comparable Properties (5)

3365 CATALINA CV, ROUND ROCK, TX 78665
0.00 mi 100% similar Same subdivision
5 bed 3 bath 2,381 sqft Built 2019
Raw Value $678,291
Adjusted Value $524,085

Adjusted -$145,454 for 667 sqft less living space and -$8,752 for being older. Net adjustment: -$154,206.

4 bed 3 bath 1,936 sqft Built 2016
Raw Value $373,820
Adjusted Value $329,784

Adjusted -$48,412 for 222 sqft less living space and +$4,376 for being newer. Net adjustment: -$44,036.

4 bed 3 bath 1,926 sqft Built 2016
Raw Value $485,999
Adjusted Value $444,144

Adjusted -$46,231 for 212 sqft less living space and +$4,376 for being newer. Net adjustment: -$41,855.

5 bed 3 bath 1,864 sqft Built 2019
Raw Value $456,267
Adjusted Value $414,804

Adjusted -$32,711 for 150 sqft less living space and -$8,752 for being older. Net adjustment: -$41,463.

3364 CATALINA CV, ROUND ROCK, TX 78665
0.00 mi 98% similar Same subdivision
4 bed 3 bath 3,218 sqft Built 2019
Raw Value $665,470
Adjusted Value $328,737

Adjusted -$327,981 for 1,504 sqft less living space and -$8,752 for being older. Net adjustment: -$336,733.

The Neighborhood

This home is valued 5.9% above the R491507D - PALOMA LAKE PLANTATION, GRANDHAVEN median of $499,831. With 695 homes in the subdivision, the property sits in the upper tier. Note that values in this subdivision declined 1.7% over the past year.

R491507D - PALOMA LAKE PLANTATION, GRANDHAVEN

typical
695 Properties
$499,831 Median Value
-1.7% YoY Change
1% Have Pool
100% Have Garage
This Home
$529,358
Median
$499,831

This home is +5.9% above the subdivision median.

Tax Analysis

The estimated annual property tax is $10,056 across all districts. With a homestead exemption claimed, that drops to $8,708 — saving $1,348 per year. That's $726 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%$4,728
Paloma Lakes MUD #1MUD0.3725%$1,972
Williamson CountyCounty0.3694%$1,956
Austin Community Collegespecial0.1034%$547
Williamson County ESD #9 - Round RockESD0.0999%$529
Williamson County FM/RdCounty0.0443%$235
Upper Brushy Creek WCIDWater0.0170%$90
Williamson Central Appraisal Districtcad0.0000%$0
Total Annual Tax1.8997%$10,056

Mortgage Context

At today's 30-year mortgage rate of 6.38%, a buyer financing $414,804 would pay approximately $2,589 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