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

1638 DIANA DR, ROUND ROCK, TX 78664

ROUND ROCK, 78664 — williamson County

3 bed2 bath1,327 sqftBuilt 1998

Property at a Glance

This home is estimated between $210,694 and $468,455, with a best estimate of $274,751. That places the property below the R655498G - Spring Ridge median of $314,073, in a neighborhood that declined 8.5% over the past year.

Estimated Value Range

$210,694 $468,455
Best Estimate
$274,751
WCAD Value
$274,797
High Confidence

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

Based on 5 comparable properties in R655498G - Spring Ridge, this home's estimated market value is between $210,694 and $468,455. All 5 comparables are in the same subdivision, giving this estimate high confidence.

Comparable Properties (5)

1610 DIANA DR, ROUND ROCK, TX 78664
0.00 mi 100% similar Same subdivision
3 bed 2 bath 1,778 sqft Built 1999
Raw Value $311,149
Adjusted Value $210,694

Adjusted -$95,880 for 451 sqft less living space and -$4,575 for being older. Net adjustment: -$100,455.

1601 DIANA DR, ROUND ROCK, TX 78664
0.00 mi 100% similar Same subdivision
4 bed 2 bath 1,122 sqft Built 1998
Raw Value $424,873
Adjusted Value $468,455

Adjusted +$43,582 for 205 sqft more living space. Net adjustment: +$43,582.

1630 DIANA DR, ROUND ROCK, TX 78664
0.00 mi 100% similar Same subdivision
3 bed 2 bath 1,597 sqft Built 1999
Raw Value $312,235
Adjusted Value $250,260

Adjusted -$57,400 for 270 sqft less living space and -$4,575 for being older. Net adjustment: -$61,975.

1617 DIANA DR, ROUND ROCK, TX 78664
0.00 mi 100% similar Same subdivision
3 bed 2 bath 1,352 sqft Built 1998
Raw Value $285,620
Adjusted Value $280,305

Adjusted -$5,315 for 25 sqft less living space. Net adjustment: -$5,315.

1620 DIANA DR, ROUND ROCK, TX 78664
0.00 mi 100% similar Same subdivision
3 bed 2 bath 1,323 sqft Built 1999
Raw Value $278,476
Adjusted Value $274,751

Adjusted +$850 for 4 sqft more living space and -$4,575 for being older. Net adjustment: -$3,725.

The Neighborhood

This home is valued 12.5% below the R655498G - Spring Ridge median of $314,073. That positions it competitively for buyers comparing within the neighborhood. Note that values in this subdivision declined 8.5% over the past year.

R655498G - Spring Ridge

typical
108 Properties
$314,073 Median Value
-8.5% YoY Change
0% Have Pool
99% Have Garage
This Home
$274,797
Median
$314,073

This home is -12.5% below the subdivision median.

Tax Analysis

The estimated annual property tax is $4,944 across all districts. With a homestead exemption claimed, that drops to $3,643 — saving $1,301 per year. That's $304 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%$2,454
Round RockCity0.3720%$1,022
Williamson CountyCounty0.3694%$1,015
Austin Community Collegespecial0.1034%$284
Williamson County FM/RdCounty0.0443%$122
Upper Brushy Creek WCIDWater0.0170%$47
Williamson Central Appraisal Districtcad0.0000%$0
Total Annual Tax1.7993%$4,944

Mortgage Context

At today's 30-year mortgage rate of 6.38%, a buyer financing $274,751 would pay approximately $1,715 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