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

4008 SAPPHIRE LOOP, ROUND ROCK, TX 78681

ROUND ROCK, 78681 — williamson County

4 bed2 bath1,880 sqftBuilt 2009

Property at a Glance

This home is estimated between $290,941 and $674,242, with a best estimate of $355,422. 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

$290,941 $674,242
Best Estimate
$355,422
WCAD Value
$635,228
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 $290,941 and $674,242. All 5 comparables are in the same subdivision, giving this estimate high confidence.

Comparable Properties (5)

4012 SAPPHIRE LOOP, ROUND ROCK, TX 78681
0.01 mi 100% similar Same subdivision
3 bed 2 bath 2,338 sqft Built 2009
Raw Value $495,785
Adjusted Value $355,422

Adjusted -$140,363 for 458 sqft less living space. Net adjustment: -$140,363.

4000 SAPPHIRE LOOP, ROUND ROCK, TX 78681
0.02 mi 100% similar Same subdivision
3 bed 2 bath 2,366 sqft Built 2007
Raw Value $492,054
Adjusted Value $347,105

Adjusted -$148,944 for 486 sqft less living space and +$3,995 for being newer. Net adjustment: -$144,949.

3996 SAPPHIRE LOOP, ROUND ROCK, TX 78681
0.04 mi 100% similar Same subdivision
3 bed 2 bath 2,279 sqft Built 2009
Raw Value $484,124
Adjusted Value $361,843

Adjusted -$122,281 for 399 sqft less living space. Net adjustment: -$122,281.

3992 SAPPHIRE LOOP, ROUND ROCK, TX 78681
0.05 mi 100% similar Same subdivision
4 bed 3 bath 1,695 sqft Built 2007
Raw Value $613,550
Adjusted Value $674,242

Adjusted +$56,697 for 185 sqft more living space and +$3,995 for being newer. Net adjustment: +$60,692.

3984 SAPPHIRE LOOP, ROUND ROCK, TX 78681
0.09 mi 100% similar Same subdivision
3 bed 2 bath 2,676 sqft Built 2008
Raw Value $532,893
Adjusted Value $290,941

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

The Neighborhood

This home is valued 1.9% above the L495414C - BORHO/MAYFIELD RANCH/SAPPHIRE LOOP median of $623,673. With 427 homes in the subdivision, the property sits in the upper tier. 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
$635,228
Median
$623,673

This home is +1.9% above the subdivision median.

Tax Analysis

The estimated annual property tax is $12,661 across all districts. With a homestead exemption claimed, that drops to $11,022 — saving $1,639 per year. That's $919 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%$6,904
Round RockCity0.3720%$2,363
Williamson CountyCounty0.3694%$2,347
Austin Community Collegespecial0.1034%$657
Williamson County FM/RdCounty0.0443%$282
Upper Brushy Creek WCIDWater0.0170%$108
Williamson Central Appraisal Districtcad0.0000%$0
Total Annual Tax1.9931%$12,661

Mortgage Context

At today's 30-year mortgage rate of 6.38%, a buyer financing $355,422 would pay approximately $2,219 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