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3909 SAPPHIRE LOOP, ROUND ROCK, TX 78681

ROUND ROCK, 78681 — williamson County

4 bed3 bath2,000 sqftBuilt 2011

Property at a Glance

This home is estimated between $283,714 and $686,136, with a best estimate of $576,035. That places the property below the L495414C - BORHO/MAYFIELD RANCH/SAPPHIRE LOOP median of $623,673, in a neighborhood that declined 8.0% over the past year.

Estimated Value Range

$283,714 $686,136
Best Estimate
$576,035
WCAD Value
$686,621
High Confidence

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

Based on 5 comparable properties in L495414C - BORHO/MAYFIELD RANCH/SAPPHIRE LOOP, this home's estimated market value is between $283,714 and $686,136. All 5 comparables are in the same subdivision, giving this estimate high confidence.

Comparable Properties (5)

3917 SAPPHIRE LOOP, ROUND ROCK, TX 78681
0.00 mi 100% similar Same subdivision
4 bed 3 bath 2,205 sqft Built 2011
Raw Value $638,861
Adjusted Value $576,035

Adjusted -$62,826 for 205 sqft less living space. Net adjustment: -$62,826.

4009 SAPPHIRE LOOP, ROUND ROCK, TX 78681
0.00 mi 100% similar Same subdivision
4 bed 3 bath 2,003 sqft Built 2011
Raw Value $687,055
Adjusted Value $686,136

Adjusted -$919 for 3 sqft less living space. Net adjustment: -$919.

3920 SAPPHIRE LOOP, ROUND ROCK, TX 78681
0.00 mi 100% similar Same subdivision
4 bed 3 bath 2,496 sqft Built 2011
Raw Value $498,039
Adjusted Value $346,031

Adjusted -$152,008 for 496 sqft less living space. Net adjustment: -$152,008.

4112 SAPPHIRE LOOP, ROUND ROCK, TX 78681
0.00 mi 100% similar Same subdivision
4 bed 3 bath 3,208 sqft Built 2008
Raw Value $647,936
Adjusted Value $283,714

Adjusted -$370,214 for 1,208 sqft less living space and +$5,992 for being newer. Net adjustment: -$364,222.

4013 SAPPHIRE LOOP, ROUND ROCK, TX 78681
0.00 mi 100% similar Same subdivision
4 bed 3 bath 1,997 sqft Built 2011
Raw Value $636,693
Adjusted Value $637,612

Adjusted +$919 for 3 sqft more living space. Net adjustment: +$919.

The Neighborhood

This home is valued 10.1% above the L495414C - BORHO/MAYFIELD RANCH/SAPPHIRE LOOP median of $623,673. With 427 homes in the subdivision, the property sits in the upper tier. Note that values in this subdivision declined 8.0% over the past year.

L495414C - BORHO/MAYFIELD RANCH/SAPPHIRE LOOP

typical
427 Properties
$623,673 Median Value
-8.0% YoY Change
1% Have Pool
100% Have Garage
This Home
$686,621
Median
$623,673

This home is +10.1% above the subdivision median.

Tax Analysis

The estimated annual property tax is $13,685 across all districts. With a homestead exemption claimed, that drops to $12,036 — saving $1,649 per year. That's $1,003 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
Leander ISDSchool1.0869%$7,463
Round RockCity0.3720%$2,554
Williamson CountyCounty0.3694%$2,537
Austin Community Collegespecial0.1034%$710
Williamson County FM/RdCounty0.0443%$304
Upper Brushy Creek WCIDWater0.0170%$117
Williamson Central Appraisal Districtcad0.0000%$0
Total Annual Tax1.9931%$13,685

Mortgage Context

At today's 30-year mortgage rate of 6.38%, a buyer financing $576,035 would pay approximately $3,596 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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