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4005 SAPPHIRE LOOP, ROUND ROCK, TX 78681

ROUND ROCK, 78681 — williamson County

5 bed5 bath2,208 sqftBuilt 2011

Property at a Glance

This home is estimated between $409,776 and $749,881, with a best estimate of $639,780. 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

$409,776 $749,881
Best Estimate
$639,780
WCAD Value
$698,101
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 $409,776 and $749,881. 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 $639,780

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

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 $749,881

Adjusted +$62,826 for 205 sqft more living space. Net adjustment: +$62,826.

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 $409,776

Adjusted -$88,263 for 288 sqft less living space. Net adjustment: -$88,263.

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 $701,358

Adjusted +$64,665 for 211 sqft more living space. Net adjustment: +$64,665.

3912 SAPPHIRE LOOP, ROUND ROCK, TX 78681
0.00 mi 95% similar Same subdivision
3 bed 2 bath 2,521 sqft Built 2008
Raw Value $603,157
Adjusted Value $513,224

Adjusted -$95,925 for 313 sqft less living space and +$5,992 for being newer. Net adjustment: -$89,933.

The Neighborhood

This home is valued 11.9% 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
$698,101
Median
$623,673

This home is +11.9% above the subdivision median.

Tax Analysis

The estimated annual property tax is $13,914 across all districts. With a homestead exemption claimed, that drops to $12,263 — saving $1,651 per year. That's $1,022 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%$7,588
Round RockCity0.3720%$2,597
Williamson CountyCounty0.3694%$2,579
Austin Community Collegespecial0.1034%$722
Williamson County FM/RdCounty0.0443%$309
Upper Brushy Creek WCIDWater0.0170%$119
Williamson Central Appraisal Districtcad0.0000%$0
Total Annual Tax1.9931%$13,914

Mortgage Context

At today's 30-year mortgage rate of 6.38%, a buyer financing $639,780 would pay approximately $3,993 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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