Beta Williamson County, TX only — data and coverage are limited during early access.

4001 SAPPHIRE LOOP, ROUND ROCK, TX 78681

ROUND ROCK, 78681 — williamson County

3 bed2 bath2,559 sqftBuilt 2007

Property at a Glance

This home is estimated between $468,087 and $612,806, with a best estimate of $504,528. 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

$468,087 $612,806
Best Estimate
$504,528
WCAD Value
$503,294
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 $468,087 and $612,806. All 5 comparables are in the same subdivision, giving this estimate high confidence.

Comparable Properties (5)

3912 SAPPHIRE LOOP, ROUND ROCK, TX 78681
0.00 mi 100% similar Same subdivision
3 bed 2 bath 2,521 sqft Built 2008
Raw Value $603,157
Adjusted Value $612,806

Adjusted +$11,646 for 38 sqft more living space and -$1,997 for being older. Net adjustment: +$9,649.

3929 SAPPHIRE LOOP, ROUND ROCK, TX 78681
0.00 mi 100% similar Same subdivision
3 bed 2 bath 2,517 sqft Built 2007
Raw Value $491,656
Adjusted Value $504,528

Adjusted +$12,872 for 42 sqft more living space. Net adjustment: +$12,872.

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 $509,357

Adjusted +$19,308 for 63 sqft more living space and -$7,990 for being older. Net adjustment: +$11,318.

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 $468,087

Adjusted -$92,553 for 302 sqft less living space and -$1,997 for being older. Net adjustment: -$94,550.

4100 SAPPHIRE LOOP, ROUND ROCK, TX 78681
0.00 mi 100% similar Same subdivision
3 bed 2 bath 2,852 sqft Built 2007
Raw Value $559,535
Adjusted Value $469,740

Adjusted -$89,795 for 293 sqft less living space. Net adjustment: -$89,795.

The Neighborhood

This home is valued 19.3% 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

below average
427 Properties
$623,673 Median Value
-8.0% YoY Change
1% Have Pool
100% Have Garage
This Home
$503,294
Median
$623,673

This home is -19.3% below the subdivision median.

Tax Analysis

The estimated annual property tax is $10,031 across all districts. With a homestead exemption claimed, that drops to $8,416 — saving $1,615 per year. That's $701 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%$5,470
Round RockCity0.3720%$1,872
Williamson CountyCounty0.3694%$1,859
Austin Community Collegespecial0.1034%$520
Williamson County FM/RdCounty0.0443%$223
Upper Brushy Creek WCIDWater0.0170%$86
Williamson Central Appraisal Districtcad0.0000%$0
Total Annual Tax1.9931%$10,031

Mortgage Context

At today's 30-year mortgage rate of 6.38%, a buyer financing $504,528 would pay approximately $3,149 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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