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

3901 SAPPHIRE LOOP, ROUND ROCK, TX 78681

ROUND ROCK, 78681 — williamson County

4 bed3 bath1,898 sqftBuilt 2010

Property at a Glance

This home is estimated between $250,457 and $652,879, with a best estimate of $542,778. 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

$250,457 $652,879
Best Estimate
$542,778
WCAD Value
$621,235
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 $250,457 and $652,879. 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 $542,778

Adjusted -$94,086 for 307 sqft less living space and -$1,997 for being older. Net adjustment: -$96,083.

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 $652,879

Adjusted -$32,179 for 105 sqft less living space and -$1,997 for being older. Net adjustment: -$34,176.

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 $312,774

Adjusted -$183,268 for 598 sqft less living space and -$1,997 for being older. Net adjustment: -$185,265.

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 $604,356

Adjusted -$30,340 for 99 sqft less living space and -$1,997 for being older. Net adjustment: -$32,337.

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 $250,457

Adjusted -$401,474 for 1,310 sqft less living space and +$3,995 for being newer. Net adjustment: -$397,479.

The Neighborhood

This home is in line with the L495414C - BORHO/MAYFIELD RANCH/SAPPHIRE LOOP median of $623,673. 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
$621,235
Median
$623,673

This home is -0.4% below the subdivision median.

Tax Analysis

The estimated annual property tax is $12,382 across all districts. With a homestead exemption claimed, that drops to $10,745 — saving $1,637 per year. That's $895 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%$6,752
Round RockCity0.3720%$2,311
Williamson CountyCounty0.3694%$2,295
Austin Community Collegespecial0.1034%$642
Williamson County FM/RdCounty0.0443%$275
Upper Brushy Creek WCIDWater0.0170%$106
Williamson Central Appraisal Districtcad0.0000%$0
Total Annual Tax1.9931%$12,382

Mortgage Context

At today's 30-year mortgage rate of 6.38%, a buyer financing $542,778 would pay approximately $3,388 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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