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

4004 SAPPHIRE LOOP, ROUND ROCK, TX 78681

ROUND ROCK, 78681 — williamson County

3 bed2 bath1,217 sqftBuilt 2010

Property at a Glance

This home is estimated between $154,231 and $559,423, with a best estimate of $434,036. 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

$154,231 $559,423
Best Estimate
$434,036
WCAD Value
$544,758
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 $154,231 and $559,423. All 5 comparables are in the same subdivision, giving this estimate high confidence.

Comparable Properties (5)

3988 SAPPHIRE LOOP, ROUND ROCK, TX 78681
0.06 mi 100% similar Same subdivision
3 bed 2 bath 1,167 sqft Built 2008
Raw Value $540,105
Adjusted Value $559,423

Adjusted +$15,323 for 50 sqft more living space and +$3,995 for being newer. Net adjustment: +$19,318.

3972 SAPPHIRE LOOP, ROUND ROCK, TX 78681
0.09 mi 100% similar Same subdivision
4 bed 3 bath 1,216 sqft Built 2010
Raw Value $539,584
Adjusted Value $539,890

Adjusted +$306 for 1 sqft more living space. Net adjustment: +$306.

4008 SAPPHIRE LOOP, ROUND ROCK, TX 78681
0.01 mi 99% similar Same subdivision
4 bed 2 bath 1,880 sqft Built 2009
Raw Value $635,228
Adjusted Value $434,036

Adjusted -$203,189 for 663 sqft less living space and +$1,997 for being newer. Net adjustment: -$201,192.

3996 SAPPHIRE LOOP, ROUND ROCK, TX 78681
0.03 mi 98% similar Same subdivision
3 bed 2 bath 2,279 sqft Built 2009
Raw Value $484,124
Adjusted Value $160,652

Adjusted -$325,469 for 1,062 sqft less living space and +$1,997 for being newer. Net adjustment: -$323,472.

4012 SAPPHIRE LOOP, ROUND ROCK, TX 78681
0.02 mi 98% similar Same subdivision
3 bed 2 bath 2,338 sqft Built 2009
Raw Value $495,785
Adjusted Value $154,231

Adjusted -$343,551 for 1,121 sqft less living space and +$1,997 for being newer. Net adjustment: -$341,554.

The Neighborhood

This home is valued 12.7% 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
$544,758
Median
$623,673

This home is -12.7% below the subdivision median.

Tax Analysis

The estimated annual property tax is $10,857 across all districts. With a homestead exemption claimed, that drops to $9,235 — saving $1,622 per year. That's $770 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%$5,921
Round RockCity0.3720%$2,026
Williamson CountyCounty0.3694%$2,013
Austin Community Collegespecial0.1034%$563
Williamson County FM/RdCounty0.0443%$241
Upper Brushy Creek WCIDWater0.0170%$93
Williamson Central Appraisal Districtcad0.0000%$0
Total Annual Tax1.9931%$10,857

Mortgage Context

At today's 30-year mortgage rate of 6.38%, a buyer financing $434,036 would pay approximately $2,709 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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