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

3984 SAPPHIRE LOOP, ROUND ROCK, TX 78681

ROUND ROCK, 78681 — williamson County

3 bed2 bath2,676 sqftBuilt 2008

Property at a Glance

This home is estimated between $589,056 and $877,180, with a best estimate of $603,795. 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

$589,056 $877,180
Best Estimate
$603,795
WCAD Value
$532,893
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 $589,056 and $877,180. All 5 comparables are in the same subdivision, giving this estimate high confidence.

Comparable Properties (5)

3996 SAPPHIRE LOOP, ROUND ROCK, TX 78681
0.05 mi 100% similar Same subdivision
3 bed 2 bath 2,279 sqft Built 2009
Raw Value $484,124
Adjusted Value $603,795

Adjusted +$121,668 for 397 sqft more living space and -$1,997 for being older. Net adjustment: +$119,671.

4000 SAPPHIRE LOOP, ROUND ROCK, TX 78681
0.06 mi 100% similar Same subdivision
3 bed 2 bath 2,366 sqft Built 2007
Raw Value $492,054
Adjusted Value $589,056

Adjusted +$95,005 for 310 sqft more living space and +$1,997 for being newer. Net adjustment: +$97,002.

3960 SAPPHIRE LOOP, ROUND ROCK, TX 78681
0.08 mi 100% similar Same subdivision
3 bed 2 bath 2,522 sqft Built 2007
Raw Value $563,723
Adjusted Value $612,916

Adjusted +$47,196 for 154 sqft more living space and +$1,997 for being newer. Net adjustment: +$49,193.

3956 SAPPHIRE LOOP, ROUND ROCK, TX 78681
0.09 mi 100% similar Same subdivision
3 bed 2 bath 2,321 sqft Built 2007
Raw Value $481,560
Adjusted Value $592,353

Adjusted +$108,796 for 355 sqft more living space and +$1,997 for being newer. Net adjustment: +$110,793.

4008 SAPPHIRE LOOP, ROUND ROCK, TX 78681
0.09 mi 100% similar Same subdivision
4 bed 2 bath 1,880 sqft Built 2009
Raw Value $635,228
Adjusted Value $877,180

Adjusted +$243,949 for 796 sqft more living space and -$1,997 for being older. Net adjustment: +$241,952.

The Neighborhood

This home is valued 14.6% 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
$532,893
Median
$623,673

This home is -14.6% below the subdivision median.

Tax Analysis

The estimated annual property tax is $10,621 across all districts. With a homestead exemption claimed, that drops to $9,001 — saving $1,620 per year. That's $750 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%$5,792
Round RockCity0.3720%$1,982
Williamson CountyCounty0.3694%$1,969
Austin Community Collegespecial0.1034%$551
Williamson County FM/RdCounty0.0443%$236
Upper Brushy Creek WCIDWater0.0170%$91
Williamson Central Appraisal Districtcad0.0000%$0
Total Annual Tax1.9931%$10,621

Mortgage Context

At today's 30-year mortgage rate of 6.38%, a buyer financing $603,795 would pay approximately $3,769 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