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

3613 SANDY KOUFAX LN, ROUND ROCK, TX 78665

ROUND ROCK, 78665 — williamson County

3 bed2 bath1,399 sqftBuilt 2003

Property at a Glance

This home is estimated between $248,950 and $419,268, with a best estimate of $250,728. That places the property below the R454400F - Ryan's Crossing Sec 1 Thru 6 median of $339,919, in a neighborhood that declined 9.3% over the past year.

Estimated Value Range

$248,950 $419,268
Best Estimate
$250,728
WCAD Value
$309,326
High Confidence

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

Based on 5 comparable properties in R454400F - Ryan's Crossing Sec 1 Thru 6, this home's estimated market value is between $248,950 and $419,268. All 5 comparables are in the same subdivision, giving this estimate high confidence.

Comparable Properties (5)

3428 SANDY KOUFAX LN, ROUND ROCK, TX 78665
0.00 mi 100% similar Same subdivision
3 bed 2 bath 1,020 sqft Built 2003
Raw Value $348,644
Adjusted Value $419,268

Adjusted +$70,624 for 379 sqft more living space. Net adjustment: +$70,624.

3601 SANDY KOUFAX LN, ROUND ROCK, TX 78665
0.00 mi 100% similar Same subdivision
3 bed 2 bath 1,892 sqft Built 2003
Raw Value $341,792
Adjusted Value $249,924

Adjusted -$91,868 for 493 sqft less living space. Net adjustment: -$91,868.

3625 SANDY KOUFAX LN, ROUND ROCK, TX 78665
0.00 mi 100% similar Same subdivision
3 bed 2 bath 1,816 sqft Built 2003
Raw Value $326,655
Adjusted Value $248,950

Adjusted -$77,705 for 417 sqft less living space. Net adjustment: -$77,705.

3607 SANDY KOUFAX LN, ROUND ROCK, TX 78665
0.00 mi 100% similar Same subdivision
3 bed 2 bath 1,892 sqft Built 2003
Raw Value $342,596
Adjusted Value $250,728

Adjusted -$91,868 for 493 sqft less living space. Net adjustment: -$91,868.

3410 SANDY KOUFAX LN, ROUND ROCK, TX 78665
0.00 mi 100% similar Same subdivision
3 bed 2 bath 1,059 sqft Built 2002
Raw Value $353,039
Adjusted Value $415,444

Adjusted +$63,357 for 340 sqft more living space and -$952 for being older. Net adjustment: +$62,405.

The Neighborhood

This home is valued 9.0% below the R454400F - Ryan's Crossing Sec 1 Thru 6 median of $339,919. That positions it competitively for buyers comparing within the neighborhood. Note that values in this subdivision declined 9.3% over the past year.

R454400F - Ryan's Crossing Sec 1 Thru 6

typical
567 Properties
$339,919 Median Value
-9.3% YoY Change
1% Have Pool
100% Have Garage
This Home
$309,326
Median
$339,919

This home is -9.0% below the subdivision median.

Tax Analysis

The estimated annual property tax is $5,566 across all districts. With a homestead exemption claimed, that drops to $4,258 — saving $1,308 per year. That's $355 per month a buyer should budget. The assessed value increased -2.8% vs the subdivision average of -9.3%. This above-average increase gives a protest opportunity score of 33 out of 100 — it may be worth challenging the appraisal.

Tax Districts

DistrictTypeRateAnnual Amount
Round Rock ISDSchool0.8931%$2,763
Round RockCity0.3720%$1,151
Williamson CountyCounty0.3694%$1,143
Austin Community Collegespecial0.1034%$320
Williamson County FM/RdCounty0.0443%$137
Upper Brushy Creek WCIDWater0.0170%$53
Williamson Central Appraisal Districtcad0.0000%$0
Total Annual Tax1.7993%$5,566
33 / 100

Some opportunity.

Mortgage Context

At today's 30-year mortgage rate of 6.38%, a buyer financing $250,728 would pay approximately $1,565 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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