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

3972 SAPPHIRE LOOP, ROUND ROCK, TX 78681

ROUND ROCK, 78681 — williamson County

4 bed3 bath1,216 sqftBuilt 2010

Property at a Glance

This home is estimated between $384,946 and $559,117, with a best estimate of $398,781. 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

$384,946 $559,117
Best Estimate
$398,781
WCAD Value
$539,584
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 $384,946 and $559,117. All 5 comparables are in the same subdivision, giving this estimate high confidence.

Comparable Properties (5)

3968 SAPPHIRE LOOP, ROUND ROCK, TX 78681
0.01 mi 100% similar Same subdivision
4 bed 3 bath 1,850 sqft Built 2010
Raw Value $579,247
Adjusted Value $384,946

Adjusted -$194,301 for 634 sqft less living space. Net adjustment: -$194,301.

3976 SAPPHIRE LOOP, ROUND ROCK, TX 78681
0.02 mi 100% similar Same subdivision
4 bed 3 bath 1,879 sqft Built 2008
Raw Value $597,975
Adjusted Value $398,781

Adjusted -$203,189 for 663 sqft less living space and +$3,995 for being newer. Net adjustment: -$199,194.

3964 SAPPHIRE LOOP, ROUND ROCK, TX 78681
0.02 mi 100% similar Same subdivision
4 bed 3 bath 1,934 sqft Built 2007
Raw Value $599,942
Adjusted Value $385,890

Adjusted -$220,044 for 718 sqft less living space and +$5,992 for being newer. Net adjustment: -$214,052.

3988 SAPPHIRE LOOP, ROUND ROCK, TX 78681
0.06 mi 100% similar Same subdivision
3 bed 2 bath 1,167 sqft Built 2008
Raw Value $540,105
Adjusted Value $559,117

Adjusted +$15,017 for 49 sqft more living space and +$3,995 for being newer. Net adjustment: +$19,012.

3992 SAPPHIRE LOOP, ROUND ROCK, TX 78681
0.06 mi 100% similar Same subdivision
4 bed 3 bath 1,695 sqft Built 2007
Raw Value $613,550
Adjusted Value $472,744

Adjusted -$146,798 for 479 sqft less living space and +$5,992 for being newer. Net adjustment: -$140,806.

The Neighborhood

This home is valued 13.5% 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
$539,584
Median
$623,673

This home is -13.5% below the subdivision median.

Tax Analysis

The estimated annual property tax is $10,754 across all districts. With a homestead exemption claimed, that drops to $9,133 — saving $1,621 per year. That's $761 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%$5,865
Round RockCity0.3720%$2,007
Williamson CountyCounty0.3694%$1,993
Austin Community Collegespecial0.1034%$558
Williamson County FM/RdCounty0.0443%$239
Upper Brushy Creek WCIDWater0.0170%$92
Williamson Central Appraisal Districtcad0.0000%$0
Total Annual Tax1.9931%$10,754

Mortgage Context

At today's 30-year mortgage rate of 6.38%, a buyer financing $398,781 would pay approximately $2,489 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.

View full property details