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3100 DIEGO CV, ROUND ROCK, TX 78665

ROUND ROCK, 78665 — williamson County

4 bed2 bath1,870 sqftBuilt 2018

Property at a Glance

This home is estimated between $368,179 and $562,480, with a best estimate of $401,775. 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

$368,179 $562,480
Best Estimate
$401,775
WCAD Value
$422,346
Low Confidence

Based on 5 comparable properties(1 in the same subdivision)

There are 5 comparable properties within range, but few are in R491507D - PALOMA LAKE PLANTATION, GRANDHAVEN. The estimated range of $368,179 and $562,480 should be treated as a rough guide.

Comparable Properties (5)

3 bed 2 bath 1,919 sqft Built 2016
Raw Value $403,709
Adjusted Value $401,775

Adjusted -$10,686 for 49 sqft less living space and +$8,752 for being newer. Net adjustment: -$1,934.

3365 CATALINA CV, ROUND ROCK, TX 78665
0.00 mi 99% similar Same subdivision
5 bed 3 bath 2,381 sqft Built 2019
Raw Value $678,291
Adjusted Value $562,480

Adjusted -$111,435 for 511 sqft less living space and -$4,376 for being older. Net adjustment: -$115,811.

4 bed 3 bath 1,926 sqft Built 2016
Raw Value $485,999
Adjusted Value $482,539

Adjusted -$12,212 for 56 sqft less living space and +$8,752 for being newer. Net adjustment: -$3,460.

4 bed 3 bath 1,936 sqft Built 2016
Raw Value $373,820
Adjusted Value $368,179

Adjusted -$14,393 for 66 sqft less living space and +$8,752 for being newer. Net adjustment: -$5,641.

3 bed 2 bath 1,679 sqft Built 2019
Raw Value $356,738
Adjusted Value $394,014

Adjusted +$41,652 for 191 sqft more living space and -$4,376 for being older. Net adjustment: +$37,276.

The Neighborhood

This home is valued 15.5% 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

below average
695 Properties
$499,831 Median Value
-1.7% YoY Change
1% Have Pool
100% Have Garage
This Home
$422,346
Median
$499,831

This home is -15.5% below the subdivision median.

Tax Analysis

The estimated annual property tax is $8,023 across all districts. With a homestead exemption claimed, that drops to $6,695 — saving $1,328 per year. That's $558 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%$3,772
Paloma Lakes MUD #1MUD0.3725%$1,573
Williamson CountyCounty0.3694%$1,560
Austin Community Collegespecial0.1034%$437
Williamson County ESD #9 - Round RockESD0.0999%$422
Williamson County FM/RdCounty0.0443%$187
Upper Brushy Creek WCIDWater0.0170%$72
Williamson Central Appraisal Districtcad0.0000%$0
Total Annual Tax1.8997%$8,023

Mortgage Context

At today's 30-year mortgage rate of 6.38%, a buyer financing $401,775 would pay approximately $2,508 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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