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

3925 SAPPHIRE LOOP, ROUND ROCK, TX 78681

ROUND ROCK, 78681 — williamson County

4 bed3 bath1,643 sqftBuilt 2007

Property at a Glance

This home is estimated between $228,631 and $732,760, with a best estimate of $520,213. 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

$228,631 $732,760
Best Estimate
$520,213
WCAD Value
$545,751
Medium Confidence

Based on 5 comparable properties(4 in the same subdivision)

Based on 5 comparable properties (4 in the same subdivision, 1 nearby), the estimated range is $228,631 and $732,760. More comparables in the same subdivision would strengthen this estimate.

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 $458,636

Adjusted -$172,235 for 562 sqft less living space and -$7,990 for being older. Net adjustment: -$180,225.

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 $568,736

Adjusted -$110,329 for 360 sqft less living space and -$7,990 for being older. Net adjustment: -$118,319.

4 bed 3 bath 1,704 sqft Built 2004
Raw Value $745,463
Adjusted Value $732,760

Adjusted -$18,695 for 61 sqft less living space and +$5,992 for being newer. Net adjustment: -$12,703.

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 $228,631

Adjusted -$261,418 for 853 sqft less living space and -$7,990 for being older. Net adjustment: -$269,408.

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 $520,213

Adjusted -$108,490 for 354 sqft less living space and -$7,990 for being older. Net adjustment: -$116,480.

The Neighborhood

This home is valued 12.5% 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
$545,751
Median
$623,673

This home is -12.5% below the subdivision median.

Tax Analysis

The estimated annual property tax is $10,877 across all districts. With a homestead exemption claimed, that drops to $9,255 — saving $1,622 per year. That's $771 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%$5,932
Round RockCity0.3720%$2,030
Williamson CountyCounty0.3694%$2,016
Austin Community Collegespecial0.1034%$564
Williamson County FM/RdCounty0.0443%$242
Upper Brushy Creek WCIDWater0.0170%$93
Williamson Central Appraisal Districtcad0.0000%$0
Total Annual Tax1.9931%$10,877

Mortgage Context

At today's 30-year mortgage rate of 6.38%, a buyer financing $520,213 would pay approximately $3,247 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