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

3823 SAPPHIRE LOOP, ROUND ROCK, TX 78681

ROUND ROCK, 78681 — williamson County

5 bed4 bath2,128 sqftBuilt 2007

Property at a Glance

This home is estimated between $372,440 and $717,374, with a best estimate of $607,273. 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

$372,440 $717,374
Best Estimate
$607,273
WCAD Value
$662,999
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 $372,440 and $717,374. All 5 comparables are in the same subdivision, giving this estimate high confidence.

Comparable Properties (5)

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 $607,273

Adjusted -$23,598 for 77 sqft less living space and -$7,990 for being older. Net adjustment: -$31,588.

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 $717,374

Adjusted +$38,309 for 125 sqft more living space and -$7,990 for being older. Net adjustment: +$30,319.

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 $377,269

Adjusted -$112,780 for 368 sqft less living space and -$7,990 for being older. Net adjustment: -$120,770.

4013 SAPPHIRE LOOP, ROUND ROCK, TX 78681
0.00 mi 100% similar Same subdivision
4 bed 3 bath 1,997 sqft Built 2011
Raw Value $636,693
Adjusted Value $668,850

Adjusted +$40,147 for 131 sqft more living space and -$7,990 for being older. Net adjustment: +$32,157.

3929 SAPPHIRE LOOP, ROUND ROCK, TX 78681
0.00 mi 96% similar Same subdivision
3 bed 2 bath 2,517 sqft Built 2007
Raw Value $491,656
Adjusted Value $372,440

Adjusted -$119,216 for 389 sqft less living space. Net adjustment: -$119,216.

The Neighborhood

This home is valued 6.3% 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
$662,999
Median
$623,673

This home is +6.3% above the subdivision median.

Tax Analysis

The estimated annual property tax is $13,214 across all districts. With a homestead exemption claimed, that drops to $11,570 — saving $1,644 per year. That's $964 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%$7,206
Round RockCity0.3720%$2,466
Williamson CountyCounty0.3694%$2,449
Austin Community Collegespecial0.1034%$686
Williamson County FM/RdCounty0.0443%$294
Upper Brushy Creek WCIDWater0.0170%$113
Williamson Central Appraisal Districtcad0.0000%$0
Total Annual Tax1.9931%$13,214

Mortgage Context

At today's 30-year mortgage rate of 6.38%, a buyer financing $607,273 would pay approximately $3,791 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