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5826 CASSTELLO DR, ROUND ROCK, TX 78665

ROUND ROCK, 78665 — williamson County

4 bed3 bath1,813 sqftBuilt 2016

Property at a Glance

This home is estimated between $362,190 and $579,911, with a best estimate of $408,239. That places the property below the H123414C - SIENA LIMMER LOOP median of $417,399, in a neighborhood that declined 2.7% over the past year.

Estimated Value Range

$362,190 $579,911
Best Estimate
$408,239
WCAD Value
$465,632
Low Confidence

Based on 5 comparable properties(2 in the same subdivision)

There are 5 comparable properties within range, but few are in H123414C - SIENA LIMMER LOOP. The estimated range of $362,190 and $579,911 should be treated as a rough guide.

Comparable Properties (5)

4 bed 3 bath 1,887 sqft Built 2016
Raw Value $423,749
Adjusted Value $408,239

Adjusted -$15,510 for 74 sqft less living space. Net adjustment: -$15,510.

5866 CASSTELLO DR, ROUND ROCK, TX 78665
0.00 mi 100% similar Same subdivision
3 bed 2 bath 1,791 sqft Built 2015
Raw Value $368,099
Adjusted Value $374,353

Adjusted +$4,611 for 22 sqft more living space and +$1,643 for being newer. Net adjustment: +$6,254.

4 bed 3 bath 1,658 sqft Built 2011
Raw Value $539,208
Adjusted Value $579,911

Adjusted +$32,487 for 155 sqft more living space and +$8,216 for being newer. Net adjustment: +$40,703.

4 bed 3 bath 1,575 sqft Built 2017
Raw Value $499,392
Adjusted Value $547,632

Adjusted +$49,883 for 238 sqft more living space and -$1,643 for being older. Net adjustment: +$48,240.

5853 CASSTELLO DR, ROUND ROCK, TX 78665
0.00 mi 100% similar Same subdivision
4 bed 3 bath 1,920 sqft Built 2016
Raw Value $384,616
Adjusted Value $362,190

Adjusted -$22,426 for 107 sqft less living space. Net adjustment: -$22,426.

The Neighborhood

This home is valued 11.6% above the H123414C - SIENA LIMMER LOOP median of $417,399. With 1,146 homes in the subdivision, the property sits in the upper tier. Note that values in this subdivision declined 2.7% over the past year.

H123414C - SIENA LIMMER LOOP

typical
1,146 Properties
$417,399 Median Value
-2.7% YoY Change
0% Have Pool
100% Have Garage
This Home
$465,632
Median
$417,399

This home is +11.6% above the subdivision median.

Tax Analysis

The estimated annual property tax is $11,077 across all districts. With a homestead exemption claimed, that drops to $9,303 — saving $1,774 per year. That's $775 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
Hutto ISDSchool1.2052%$5,612
Siena MUD #2MUD0.6020%$2,803
Williamson CountyCounty0.3694%$1,720
Williamson County ESD #3 - HuttoESD0.1000%$466
Williamson County FM/RdCounty0.0443%$206
EWC Higher Ed Centerspecial0.0409%$190
Upper Brushy Creek WCIDWater0.0170%$79
Williamson Central Appraisal Districtcad0.0000%$0
Total Annual Tax2.3788%$11,077

Mortgage Context

At today's 30-year mortgage rate of 6.38%, a buyer financing $408,239 would pay approximately $2,548 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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