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

3828 SAPPHIRE LOOP, ROUND ROCK, TX 78681

ROUND ROCK, 78681 — williamson County

3 bed2 bath2,780 sqftBuilt 2007

Property at a Glance

This home is estimated between $514,771 and $680,535, with a best estimate of $572,257. 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

$514,771 $680,535
Best Estimate
$572,257
WCAD Value
$559,118
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 $514,771 and $680,535. 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 $680,535

Adjusted +$79,375 for 259 sqft more living space and -$1,997 for being older. Net adjustment: +$77,378.

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 $572,257

Adjusted +$80,601 for 263 sqft more living space. Net adjustment: +$80,601.

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 $577,086

Adjusted +$87,037 for 284 sqft more living space and -$7,990 for being older. Net adjustment: +$79,047.

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 $535,816

Adjusted -$24,824 for 81 sqft less living space and -$1,997 for being older. Net adjustment: -$26,821.

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 $514,771

Adjusted -$131,168 for 428 sqft less living space and -$1,997 for being older. Net adjustment: -$133,165.

The Neighborhood

This home is valued 10.4% 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
$559,118
Median
$623,673

This home is -10.4% below the subdivision median.

Tax Analysis

The estimated annual property tax is $11,144 across all districts. With a homestead exemption claimed, that drops to $9,519 — saving $1,625 per year. That's $793 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%$6,077
Round RockCity0.3720%$2,080
Williamson CountyCounty0.3694%$2,066
Austin Community Collegespecial0.1034%$578
Williamson County FM/RdCounty0.0443%$248
Upper Brushy Creek WCIDWater0.0170%$95
Williamson Central Appraisal Districtcad0.0000%$0
Total Annual Tax1.9931%$11,144

Mortgage Context

At today's 30-year mortgage rate of 6.38%, a buyer financing $572,257 would pay approximately $3,572 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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