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

3944 SAPPHIRE LOOP, ROUND ROCK, TX 78681

ROUND ROCK, 78681 — williamson County

4 bed3 bath1,645 sqftBuilt 2006

Property at a Glance

This home is estimated between $503,376 and $539,609, with a best estimate of $509,376. 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

$503,376 $539,609
Best Estimate
$509,376
WCAD Value
$599,954
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 $503,376 and $539,609. All 5 comparables are in the same subdivision, giving this estimate high confidence.

Comparable Properties (5)

3940 SAPPHIRE LOOP, ROUND ROCK, TX 78681
0.01 mi 100% similar Same subdivision
4 bed 3 bath 1,921 sqft Built 2007
Raw Value $626,191
Adjusted Value $539,609

Adjusted -$84,585 for 276 sqft less living space and -$1,997 for being older. Net adjustment: -$86,582.

3952 SAPPHIRE LOOP, ROUND ROCK, TX 78681
0.02 mi 100% similar Same subdivision
4 bed 3 bath 1,950 sqft Built 2004
Raw Value $592,854
Adjusted Value $503,376

Adjusted -$93,473 for 305 sqft less living space and +$3,995 for being newer. Net adjustment: -$89,478.

3936 SAPPHIRE LOOP, ROUND ROCK, TX 78681
0.03 mi 100% similar Same subdivision
4 bed 3 bath 1,972 sqft Built 2007
Raw Value $620,819
Adjusted Value $518,607

Adjusted -$100,215 for 327 sqft less living space and -$1,997 for being older. Net adjustment: -$102,212.

3964 SAPPHIRE LOOP, ROUND ROCK, TX 78681
0.06 mi 100% similar Same subdivision
4 bed 3 bath 1,934 sqft Built 2007
Raw Value $599,942
Adjusted Value $509,376

Adjusted -$88,569 for 289 sqft less living space and -$1,997 for being older. Net adjustment: -$90,566.

3968 SAPPHIRE LOOP, ROUND ROCK, TX 78681
0.07 mi 100% similar Same subdivision
4 bed 3 bath 1,850 sqft Built 2010
Raw Value $579,247
Adjusted Value $508,431

Adjusted -$62,826 for 205 sqft less living space and -$7,990 for being older. Net adjustment: -$70,816.

The Neighborhood

This home is valued 3.8% 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
$599,954
Median
$623,673

This home is -3.8% below the subdivision median.

Tax Analysis

The estimated annual property tax is $11,958 across all districts. With a homestead exemption claimed, that drops to $10,325 — saving $1,633 per year. That's $860 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%$6,521
Round RockCity0.3720%$2,232
Williamson CountyCounty0.3694%$2,217
Austin Community Collegespecial0.1034%$620
Williamson County FM/RdCounty0.0443%$266
Upper Brushy Creek WCIDWater0.0170%$102
Williamson Central Appraisal Districtcad0.0000%$0
Total Annual Tax1.9931%$11,958

Mortgage Context

At today's 30-year mortgage rate of 6.38%, a buyer financing $509,376 would pay approximately $3,180 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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