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3928 SAPPHIRE LOOP, ROUND ROCK, TX 78681

ROUND ROCK, 78681 — williamson County

4 bed3 bath2,321 sqftBuilt 2011

Property at a Glance

This home is estimated between $439,578 and $784,512, with a best estimate of $547,855. 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

$439,578 $784,512
Best Estimate
$547,855
WCAD Value
$532,674
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 $439,578 and $784,512. All 5 comparables are in the same subdivision, giving this estimate high confidence.

Comparable Properties (5)

3912 SAPPHIRE LOOP, ROUND ROCK, TX 78681
0.00 mi 100% similar Same subdivision
3 bed 2 bath 2,521 sqft Built 2008
Raw Value $603,157
Adjusted Value $547,855

Adjusted -$61,294 for 200 sqft less living space and +$5,992 for being newer. Net adjustment: -$55,302.

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 $674,411

Adjusted +$35,550 for 116 sqft more living space. Net adjustment: +$35,550.

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 $784,512

Adjusted +$97,457 for 318 sqft more living space. Net adjustment: +$97,457.

3929 SAPPHIRE LOOP, ROUND ROCK, TX 78681
0.00 mi 100% similar Same subdivision
3 bed 2 bath 2,517 sqft Built 2007
Raw Value $491,656
Adjusted Value $439,578

Adjusted -$60,068 for 196 sqft less living space and +$7,990 for being newer. Net adjustment: -$52,078.

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 $444,407

Adjusted -$53,632 for 175 sqft less living space. Net adjustment: -$53,632.

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
$532,674
Median
$623,673

This home is -14.6% below the subdivision median.

Tax Analysis

The estimated annual property tax is $10,617 across all districts. With a homestead exemption claimed, that drops to $8,997 — 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%$5,790
Round RockCity0.3720%$1,982
Williamson CountyCounty0.3694%$1,968
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%$10,617

Mortgage Context

At today's 30-year mortgage rate of 6.38%, a buyer financing $547,855 would pay approximately $3,420 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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