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

4012 SAPPHIRE LOOP, ROUND ROCK, TX 78681

ROUND ROCK, 78681 — williamson County

3 bed2 bath2,338 sqftBuilt 2009

Property at a Glance

This home is estimated between $431,304 and $775,591, with a best estimate of $502,206. 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

$431,304 $775,591
Best Estimate
$502,206
WCAD Value
$495,785
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 $431,304 and $775,591. All 5 comparables are in the same subdivision, giving this estimate high confidence.

Comparable Properties (5)

4008 SAPPHIRE LOOP, ROUND ROCK, TX 78681
0.01 mi 100% similar Same subdivision
4 bed 2 bath 1,880 sqft Built 2009
Raw Value $635,228
Adjusted Value $775,591

Adjusted +$140,363 for 458 sqft more living space. Net adjustment: +$140,363.

4000 SAPPHIRE LOOP, ROUND ROCK, TX 78681
0.03 mi 100% similar Same subdivision
3 bed 2 bath 2,366 sqft Built 2007
Raw Value $492,054
Adjusted Value $487,468

Adjusted -$8,581 for 28 sqft less living space and +$3,995 for being newer. Net adjustment: -$4,586.

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 $502,206

Adjusted +$18,082 for 59 sqft more living space. Net adjustment: +$18,082.

3984 SAPPHIRE LOOP, ROUND ROCK, TX 78681
0.10 mi 100% similar Same subdivision
3 bed 2 bath 2,676 sqft Built 2008
Raw Value $532,893
Adjusted Value $431,304

Adjusted -$103,586 for 338 sqft less living space and +$1,997 for being newer. Net adjustment: -$101,589.

3980 SAPPHIRE LOOP, ROUND ROCK, TX 78681
0.11 mi 100% similar Same subdivision
4 bed 3 bath 2,189 sqft Built 2007
Raw Value $654,854
Adjusted Value $704,513

Adjusted +$45,664 for 149 sqft more living space and +$3,995 for being newer. Net adjustment: +$49,659.

The Neighborhood

This home is valued 20.5% 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

below average
427 Properties
$623,673 Median Value
-8.0% YoY Change
1% Have Pool
100% Have Garage
This Home
$495,785
Median
$623,673

This home is -20.5% below the subdivision median.

Tax Analysis

The estimated annual property tax is $9,881 across all districts. With a homestead exemption claimed, that drops to $8,268 — saving $1,613 per year. That's $689 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%$5,389
Round RockCity0.3720%$1,844
Williamson CountyCounty0.3694%$1,832
Austin Community Collegespecial0.1034%$513
Williamson County FM/RdCounty0.0443%$220
Upper Brushy Creek WCIDWater0.0170%$84
Williamson Central Appraisal Districtcad0.0000%$0
Total Annual Tax1.9931%$9,881

Mortgage Context

At today's 30-year mortgage rate of 6.38%, a buyer financing $502,206 would pay approximately $3,135 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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