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3856 SAPPHIRE LOOP, ROUND ROCK, TX 78681

ROUND ROCK, 78681 — williamson County

4 bed3 bath2,249 sqftBuilt 2008

Property at a Glance

This home is estimated between $411,519 and $756,454, with a best estimate of $519,798. 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

$411,519 $756,454
Best Estimate
$519,798
WCAD Value
$712,201
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 $411,519 and $756,454. 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 $519,798

Adjusted -$83,359 for 272 sqft less living space. Net adjustment: -$83,359.

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 $646,354

Adjusted +$13,485 for 44 sqft more living space and -$5,992 for being older. Net adjustment: +$7,493.

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 $756,454

Adjusted +$75,391 for 246 sqft more living space and -$5,992 for being older. Net adjustment: +$69,399.

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 $411,519

Adjusted -$82,134 for 268 sqft less living space and +$1,997 for being newer. Net adjustment: -$80,137.

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 $416,349

Adjusted -$75,698 for 247 sqft less living space and -$5,992 for being older. Net adjustment: -$81,690.

The Neighborhood

This home is valued 14.2% 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
$712,201
Median
$623,673

This home is +14.2% above the subdivision median.

Tax Analysis

The estimated annual property tax is $14,195 across all districts. With a homestead exemption claimed, that drops to $12,541 — saving $1,654 per year. That's $1,045 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%$7,741
Round RockCity0.3720%$2,649
Williamson CountyCounty0.3694%$2,631
Austin Community Collegespecial0.1034%$736
Williamson County FM/RdCounty0.0443%$316
Upper Brushy Creek WCIDWater0.0170%$121
Williamson Central Appraisal Districtcad0.0000%$0
Total Annual Tax1.9931%$14,195

Mortgage Context

At today's 30-year mortgage rate of 6.38%, a buyer financing $519,798 would pay approximately $3,245 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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