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3427 SANDY KOUFAX LN, ROUND ROCK, TX 78665

ROUND ROCK, 78665 — williamson County

3 bed2 bath1,858 sqftBuilt 2002

Property at a Glance

This home is estimated between $335,433 and $486,237, with a best estimate of $337,212. 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

$335,433 $486,237
Best Estimate
$337,212
WCAD Value
$328,419
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 $335,433 and $486,237. All 5 comparables are in the same subdivision, giving this estimate high confidence.

Comparable Properties (5)

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 $336,408

Adjusted -$6,336 for 34 sqft less living space and +$952 for being newer. Net adjustment: -$5,384.

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 $335,433

Adjusted +$7,826 for 42 sqft more living space and +$952 for being newer. Net adjustment: +$8,778.

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 $337,212

Adjusted -$6,336 for 34 sqft less living space and +$952 for being newer. Net adjustment: -$5,384.

3430 SANDY KOUFAX LN, ROUND ROCK, TX 78665
0.00 mi 100% similar Same subdivision
3 bed 2 bath 1,088 sqft Built 2002
Raw Value $338,204
Adjusted Value $481,689

Adjusted +$143,485 for 770 sqft more living space. Net adjustment: +$143,485.

3417 SANDY KOUFAX LN, ROUND ROCK, TX 78665
0.00 mi 100% similar Same subdivision
3 bed 2 bath 1,097 sqft Built 2003
Raw Value $343,477
Adjusted Value $486,237

Adjusted +$141,808 for 761 sqft more living space and +$952 for being newer. Net adjustment: +$142,760.

The Neighborhood

This home is valued 3.4% 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
$328,419
Median
$339,919

This home is -3.4% below the subdivision median.

Tax Analysis

The estimated annual property tax is $5,909 across all districts. With a homestead exemption claimed, that drops to $4,598 — saving $1,311 per year. That's $383 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%$2,933
Round RockCity0.3720%$1,222
Williamson CountyCounty0.3694%$1,213
Austin Community Collegespecial0.1034%$340
Williamson County FM/RdCounty0.0443%$146
Upper Brushy Creek WCIDWater0.0170%$56
Williamson Central Appraisal Districtcad0.0000%$0
Total Annual Tax1.7993%$5,909

Mortgage Context

At today's 30-year mortgage rate of 6.38%, a buyer financing $337,212 would pay approximately $2,105 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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