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

508 KOLBO DR, ROUND ROCK, TX 78665

ROUND ROCK, 78665 — williamson County

4 bed3 bath1,638 sqftBuilt 2017

Property at a Glance

This home is estimated between $313,237 and $555,025, with a best estimate of $361,135. That places the property below the R500515C - FOREST GROVE median of $686,297, in a neighborhood that declined 2.9% over the past year.

Estimated Value Range

$313,237 $555,025
Best Estimate
$361,135
WCAD Value
$730,619
Low Confidence

Based on 5 comparable properties(0 in the same subdivision)

There are 5 comparable properties within range, but none are in R500515C - FOREST GROVE. The estimated range of $313,237 and $555,025 should be treated as a rough guide.

Comparable Properties (5)

4 bed 3 bath 1,658 sqft Built 2011
Raw Value $539,208
Adjusted Value $555,025

Adjusted -$5,312 for 20 sqft less living space and +$21,129 for being newer. Net adjustment: +$15,817.

4 bed 3 bath 1,575 sqft Built 2017
Raw Value $499,392
Adjusted Value $516,125

Adjusted +$16,733 for 63 sqft more living space. Net adjustment: +$16,733.

4 bed 3 bath 1,887 sqft Built 2016
Raw Value $423,749
Adjusted Value $361,135

Adjusted -$66,135 for 249 sqft less living space and +$3,521 for being newer. Net adjustment: -$62,614.

4 bed 3 bath 1,920 sqft Built 2016
Raw Value $384,616
Adjusted Value $313,237

Adjusted -$74,900 for 282 sqft less living space and +$3,521 for being newer. Net adjustment: -$71,379.

3 bed 2 bath 1,706 sqft Built 2017
Raw Value $347,933
Adjusted Value $329,872

Adjusted -$18,061 for 68 sqft less living space. Net adjustment: -$18,061.

The Neighborhood

This home is valued 6.5% above the R500515C - FOREST GROVE median of $686,297. With 197 homes in the subdivision, the property sits in the upper tier. Note that values in this subdivision declined 2.9% over the past year.

R500515C - FOREST GROVE

typical
197 Properties
$686,297 Median Value
-2.9% YoY Change
1% Have Pool
100% Have Garage
This Home
$730,619
Median
$686,297

This home is +6.5% above the subdivision median.

Tax Analysis

The estimated annual property tax is $13,146 across all districts. With a homestead exemption claimed, that drops to $11,761 — saving $1,385 per year. That's $980 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
Round Rock ISDSchool0.8931%$6,525
Round RockCity0.3720%$2,718
Williamson CountyCounty0.3694%$2,699
Austin Community Collegespecial0.1034%$755
Williamson County FM/RdCounty0.0443%$324
Upper Brushy Creek WCIDWater0.0170%$124
Williamson Central Appraisal Districtcad0.0000%$0
Total Annual Tax1.7993%$13,146

Mortgage Context

At today's 30-year mortgage rate of 6.38%, a buyer financing $361,135 would pay approximately $2,254 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