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

3955 SAPPHIRE LOOP, ROUND ROCK, TX 78681

ROUND ROCK, 78681 — williamson County

4 bed2 bath1,978 sqftBuilt 2007

Property at a Glance

This home is estimated between $326,470 and $671,403, with a best estimate of $434,748. 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

$326,470 $671,403
Best Estimate
$434,748
WCAD Value
$613,662
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 $326,470 and $671,403. 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 $434,748

Adjusted -$166,412 for 543 sqft less living space and -$1,997 for being older. Net adjustment: -$168,409.

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 $561,303

Adjusted -$69,568 for 227 sqft less living space and -$7,990 for being older. Net adjustment: -$77,558.

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 $671,403

Adjusted -$7,662 for 25 sqft less living space and -$7,990 for being older. Net adjustment: -$15,652.

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 $326,470

Adjusted -$165,186 for 539 sqft less living space. Net adjustment: -$165,186.

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 $331,298

Adjusted -$158,751 for 518 sqft less living space and -$7,990 for being older. Net adjustment: -$166,741.

The Neighborhood

This home is valued 1.6% 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
$613,662
Median
$623,673

This home is -1.6% below the subdivision median.

Tax Analysis

The estimated annual property tax is $12,231 across all districts. With a homestead exemption claimed, that drops to $10,596 — saving $1,635 per year. That's $883 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%$6,670
Round RockCity0.3720%$2,283
Williamson CountyCounty0.3694%$2,267
Austin Community Collegespecial0.1034%$635
Williamson County FM/RdCounty0.0443%$272
Upper Brushy Creek WCIDWater0.0170%$104
Williamson Central Appraisal Districtcad0.0000%$0
Total Annual Tax1.9931%$12,231

Mortgage Context

At today's 30-year mortgage rate of 6.38%, a buyer financing $434,748 would pay approximately $2,714 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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