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3909 SANSOME LN, ROUND ROCK, TX 78681

ROUND ROCK, 78681 — williamson County

4 bed3 bath2,144 sqftBuilt 2016

Property at a Glance

This home is estimated between $415,739 and $643,579, with a best estimate of $426,633. That places the property below the G799514C - MAYFIELD RANCH median of $523,371, in a neighborhood that declined 9.3% over the past year.

Estimated Value Range

$415,739 $643,579
Best Estimate
$426,633
WCAD Value
$587,171
High Confidence

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

Based on 5 comparable properties in G799514C - MAYFIELD RANCH, this home's estimated market value is between $415,739 and $643,579. All 5 comparables are in the same subdivision, giving this estimate high confidence.

Comparable Properties (5)

3938 SANSOME LN, ROUND ROCK, TX 78681
0.00 mi 100% similar Same subdivision
4 bed 3 bath 1,891 sqft Built 2015
Raw Value $585,670
Adjusted Value $643,579

Adjusted +$56,083 for 253 sqft more living space and +$1,826 for being newer. Net adjustment: +$57,909.

3905 SANSOME LN, ROUND ROCK, TX 78681
0.00 mi 100% similar Same subdivision
5 bed 4 bath 2,107 sqft Built 2014
Raw Value $594,832
Adjusted Value $606,686

Adjusted +$8,202 for 37 sqft more living space and +$3,652 for being newer. Net adjustment: +$11,854.

3942 SANSOME LN, ROUND ROCK, TX 78681
0.00 mi 100% similar Same subdivision
4 bed 3 bath 2,740 sqft Built 2016
Raw Value $547,856
Adjusted Value $415,739

Adjusted -$132,117 for 596 sqft less living space. Net adjustment: -$132,117.

3913 SANSOME LN, ROUND ROCK, TX 78681
0.00 mi 100% similar Same subdivision
4 bed 3 bath 2,868 sqft Built 2015
Raw Value $585,298
Adjusted Value $426,633

Adjusted -$160,491 for 724 sqft less living space and +$1,826 for being newer. Net adjustment: -$158,665.

3933 SANSOME LN, ROUND ROCK, TX 78681
0.00 mi 100% similar Same subdivision
3 bed 2 bath 2,446 sqft Built 2015
Raw Value $481,757
Adjusted Value $416,638

Adjusted -$66,945 for 302 sqft less living space and +$1,826 for being newer. Net adjustment: -$65,119.

The Neighborhood

This home is valued 12.2% above the G799514C - MAYFIELD RANCH median of $523,371. With 1,093 homes in the subdivision, the property sits in the upper tier. Note that values in this subdivision declined 9.3% over the past year.

G799514C - MAYFIELD RANCH

typical
1,093 Properties
$523,371 Median Value
-9.3% YoY Change
1% Have Pool
100% Have Garage
This Home
$587,171
Median
$523,371

This home is +12.2% above the subdivision median.

Tax Analysis

The estimated annual property tax is $12,133 across all districts. With a homestead exemption claimed, that drops to $10,553 — saving $1,580 per year. That's $879 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
Georgetown ISDSchool1.0506%$6,169
Highlands at Mayfield Ranch MUDMUD0.4850%$2,848
Williamson CountyCounty0.3694%$2,169
Williamson County ESD #9 - Round RockESD0.0999%$587
Williamson County FM/RdCounty0.0443%$260
Upper Brushy Creek WCIDWater0.0170%$100
Williamson Central Appraisal Districtcad0.0000%$0
Total Annual Tax2.0663%$12,133

Mortgage Context

At today's 30-year mortgage rate of 6.38%, a buyer financing $426,633 would pay approximately $2,663 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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