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

3109 DIEGO CV, ROUND ROCK, TX 78665

ROUND ROCK, 78665 — williamson County

4 bed2 bath1,364 sqftBuilt 2018

Property at a Glance

This home is estimated between $271,907 and $400,245, with a best estimate of $299,043. 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

$271,907 $400,245
Best Estimate
$299,043
WCAD Value
$487,248
Low Confidence

Based on 5 comparable properties(0 in the same subdivision)

There are 5 comparable properties within range, but none are in R491507D - PALOMA LAKE PLANTATION, GRANDHAVEN. The estimated range of $271,907 and $400,245 should be treated as a rough guide.

Comparable Properties (5)

4 bed 2 bath 1,447 sqft Built 2020
Raw Value $427,097
Adjusted Value $400,245

Adjusted -$18,100 for 83 sqft less living space and -$8,752 for being older. Net adjustment: -$26,852.

3 bed 2 bath 1,528 sqft Built 2018
Raw Value $334,811
Adjusted Value $299,047

Adjusted -$35,764 for 164 sqft less living space. Net adjustment: -$35,764.

3 bed 2 bath 1,522 sqft Built 2019
Raw Value $337,874
Adjusted Value $299,043

Adjusted -$34,455 for 158 sqft less living space and -$4,376 for being older. Net adjustment: -$38,831.

3 bed 2 bath 1,679 sqft Built 2019
Raw Value $356,738
Adjusted Value $283,669

Adjusted -$68,693 for 315 sqft less living space and -$4,376 for being older. Net adjustment: -$73,069.

3 bed 2 bath 1,665 sqft Built 2020
Raw Value $346,299
Adjusted Value $271,907

Adjusted -$65,640 for 301 sqft less living space and -$8,752 for being older. Net adjustment: -$74,392.

The Neighborhood

This home is valued 2.5% below the R491507D - PALOMA LAKE PLANTATION, GRANDHAVEN median of $499,831. That positions it competitively for buyers comparing within the neighborhood. 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
$487,248
Median
$499,831

This home is -2.5% below the subdivision median.

Tax Analysis

The estimated annual property tax is $9,256 across all districts. With a homestead exemption claimed, that drops to $7,916 — saving $1,340 per year. That's $660 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%$4,352
Paloma Lakes MUD #1MUD0.3725%$1,815
Williamson CountyCounty0.3694%$1,800
Austin Community Collegespecial0.1034%$504
Williamson County ESD #9 - Round RockESD0.0999%$487
Williamson County FM/RdCounty0.0443%$216
Upper Brushy Creek WCIDWater0.0170%$83
Williamson Central Appraisal Districtcad0.0000%$0
Total Annual Tax1.8997%$9,256

Mortgage Context

At today's 30-year mortgage rate of 6.38%, a buyer financing $299,043 would pay approximately $1,867 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