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

1804 SUN LAKE, ROUND ROCK, TX 78664

ROUND ROCK, 78664 — williamson County

4 bed3 bath1,774 sqftBuilt 1984

Property at a Glance

This home is estimated between $149,803 and $172,905, with a best estimate of $157,106. That places the property below the R202681C - Tonkawa & Oak Springs median of $851,894, in a neighborhood that appreciated 3.7% over the past year.

Estimated Value Range

$149,803 $172,905
Best Estimate
$157,106
WCAD Value
$704,002
Low Confidence

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

There are 5 comparable properties within range, but none are in R202681C - Tonkawa & Oak Springs. The estimated range of $149,803 and $172,905 should be treated as a rough guide.

Comparable Properties (5)

3 bed 2 bath 1,837 sqft Built 2000
Raw Value $313,817
Adjusted Value $171,551

Adjusted -$21,875 for 63 sqft less living space and -$120,391 for being older. Net adjustment: -$142,266.

4 bed 3 bath 1,977 sqft Built 2016
Raw Value $484,173
Adjusted Value $172,905

Adjusted -$70,485 for 203 sqft less living space and -$240,783 for being older. Net adjustment: -$311,268.

3 bed 2 bath 1,828 sqft Built 2003
Raw Value $318,821
Adjusted Value $157,106

Adjusted -$18,750 for 54 sqft less living space and -$142,965 for being older. Net adjustment: -$161,715.

3 bed 2 bath 1,828 sqft Built 2003
Raw Value $316,410
Adjusted Value $154,695

Adjusted -$18,750 for 54 sqft less living space and -$142,965 for being older. Net adjustment: -$161,715.

3 bed 2 bath 1,837 sqft Built 2003
Raw Value $314,643
Adjusted Value $149,803

Adjusted -$21,875 for 63 sqft less living space and -$142,965 for being older. Net adjustment: -$164,840.

The Neighborhood

This home is valued 17.4% below the R202681C - Tonkawa & Oak Springs median of $851,894. That positions it competitively for buyers comparing within the neighborhood. The neighborhood appreciated 3.7% over the past year.

R202681C - Tonkawa & Oak Springs

below average
154 Properties
$851,894 Median Value
+3.7% YoY Change
7% Have Pool
92% Have Garage
This Home
$704,002
Median
$851,894

This home is -17.4% below the subdivision median.

Tax Analysis

The estimated annual property tax is $10,752 across all districts. With a homestead exemption claimed, that drops to $9,372 — saving $1,380 per year. That's $781 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%$6,287
Williamson CountyCounty0.3694%$2,601
Austin Community Collegespecial0.1034%$728
Williamson County ESD #2 - Sam Bass VFDESD0.1000%$704
Williamson County FM/RdCounty0.0443%$312
Upper Brushy Creek WCIDWater0.0170%$120
Williamson Central Appraisal Districtcad0.0000%$0
Total Annual Tax1.5273%$10,752

Mortgage Context

At today's 30-year mortgage rate of 6.38%, a buyer financing $157,106 would pay approximately $981 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