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

3971 SAPPHIRE LOOP, ROUND ROCK, TX 78681

ROUND ROCK, 78681 — williamson County

4 bed3 bath1,959 sqftBuilt 2007

Property at a Glance

This home is estimated between $263,160 and $665,580, with a best estimate of $555,480. 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

$263,160 $665,580
Best Estimate
$555,480
WCAD Value
$590,165
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 $263,160 and $665,580. 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 $555,480

Adjusted -$75,391 for 246 sqft less living space and -$7,990 for being older. Net adjustment: -$83,381.

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 $665,580

Adjusted -$13,485 for 44 sqft less living space and -$7,990 for being older. Net adjustment: -$21,475.

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 $325,475

Adjusted -$164,574 for 537 sqft less living space and -$7,990 for being older. Net adjustment: -$172,564.

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 $263,160

Adjusted -$382,779 for 1,249 sqft less living space and -$1,997 for being older. Net adjustment: -$384,776.

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 $617,057

Adjusted -$11,646 for 38 sqft less living space and -$7,990 for being older. Net adjustment: -$19,636.

The Neighborhood

This home is valued 5.4% 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
$590,165
Median
$623,673

This home is -5.4% below the subdivision median.

Tax Analysis

The estimated annual property tax is $11,762 across all districts. With a homestead exemption claimed, that drops to $10,132 — saving $1,630 per year. That's $844 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%$6,415
Round RockCity0.3720%$2,195
Williamson CountyCounty0.3694%$2,180
Austin Community Collegespecial0.1034%$610
Williamson County FM/RdCounty0.0443%$262
Upper Brushy Creek WCIDWater0.0170%$100
Williamson Central Appraisal Districtcad0.0000%$0
Total Annual Tax1.9931%$11,762

Mortgage Context

At today's 30-year mortgage rate of 6.38%, a buyer financing $555,480 would pay approximately $3,467 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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