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4105 SAPPHIRE LOOP, ROUND ROCK, TX 78681

ROUND ROCK, 78681 — williamson County

4 bed3 bath2,962 sqftBuilt 2011

Property at a Glance

This home is estimated between $578,537 and $980,958, with a best estimate of $640,853. That places the property above 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

$578,537 $980,958
Best Estimate
$640,853
WCAD Value
$586,612
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 $578,537 and $980,958. 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 $870,858

Adjusted +$231,997 for 757 sqft more living space. Net adjustment: +$231,997.

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 $980,958

Adjusted +$293,903 for 959 sqft more living space. Net adjustment: +$293,903.

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 $640,853

Adjusted +$142,814 for 466 sqft more living space. Net adjustment: +$142,814.

3815 SAPPHIRE LOOP, ROUND ROCK, TX 78681
0.00 mi 100% similar Same subdivision
3 bed 2 bath 2,861 sqft Built 2008
Raw Value $562,637
Adjusted Value $599,582

Adjusted +$30,953 for 101 sqft more living space and +$5,992 for being newer. Net adjustment: +$36,945.

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 $578,537

Adjusted -$75,391 for 246 sqft less living space and +$5,992 for being newer. Net adjustment: -$69,399.

The Neighborhood

This home is valued 5.9% below the L495414C - BORHO/MAYFIELD RANCH/SAPPHIRE LOOP median of $623,673. That positions it competitively for buyers comparing within the neighborhood. 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
$586,612
Median
$623,673

This home is -5.9% below the subdivision median.

Tax Analysis

The estimated annual property tax is $11,692 across all districts. With a homestead exemption claimed, that drops to $10,062 — saving $1,630 per year. That's $839 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%$6,376
Round RockCity0.3720%$2,182
Williamson CountyCounty0.3694%$2,167
Austin Community Collegespecial0.1034%$607
Williamson County FM/RdCounty0.0443%$260
Upper Brushy Creek WCIDWater0.0170%$100
Williamson Central Appraisal Districtcad0.0000%$0
Total Annual Tax1.9931%$11,692

Mortgage Context

At today's 30-year mortgage rate of 6.38%, a buyer financing $640,853 would pay approximately $4,000 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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