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

3905 BLUE MONSTER CV, ROUND ROCK, TX 78664

ROUND ROCK, 78664 — williamson County

5 bed4 bath1,762 sqftBuilt 2003

Property at a Glance

This home is estimated between $509,605 and $588,496, with a best estimate of $548,453. That places the property above the R550600D - Forest Creek Sec 15,16,19,31 median of $514,276, in a neighborhood that declined 8.7% over the past year.

Estimated Value Range

$509,605 $588,496
Best Estimate
$548,453
WCAD Value
$610,343
High Confidence

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

Based on 5 comparable properties in R550600D - Forest Creek Sec 15,16,19,31, this home's estimated market value is between $509,605 and $588,496. All 5 comparables are in the same subdivision, giving this estimate high confidence.

Comparable Properties (5)

3900 BLUE MONSTER CV, ROUND ROCK, TX 78664
0.00 mi 100% similar Same subdivision
5 bed 4 bath 1,608 sqft Built 2002
Raw Value $542,471
Adjusted Value $588,496

Adjusted +$44,060 for 154 sqft more living space and +$1,965 for being newer. Net adjustment: +$46,025.

3923 BLUE MONSTER CV, ROUND ROCK, TX 78664
0.00 mi 100% similar Same subdivision
4 bed 1,599 sqft Built 2003
Raw Value $501,818
Adjusted Value $548,453

Adjusted +$46,635 for 163 sqft more living space. Net adjustment: +$46,635.

3904 BLUE MONSTER CV, ROUND ROCK, TX 78664
0.00 mi 100% similar Same subdivision
4 bed 3 bath 1,830 sqft Built 2001
Raw Value $527,060
Adjusted Value $511,535

Adjusted -$19,455 for 68 sqft less living space and +$3,930 for being newer. Net adjustment: -$15,525.

3907 BLUE MONSTER CV, ROUND ROCK, TX 78664
0.00 mi 100% similar Same subdivision
5 bed 4 bath 1,542 sqft Built 2002
Raw Value $509,473
Adjusted Value $574,381

Adjusted +$62,943 for 220 sqft more living space and +$1,965 for being newer. Net adjustment: +$64,908.

3913 BLUE MONSTER CV, ROUND ROCK, TX 78664
0.00 mi 100% similar Same subdivision
5 bed 4 bath 1,718 sqft Built 2002
Raw Value $495,051
Adjusted Value $509,605

Adjusted +$12,589 for 44 sqft more living space and +$1,965 for being newer. Net adjustment: +$14,554.

The Neighborhood

This home is valued 18.7% above the R550600D - Forest Creek Sec 15,16,19,31 median of $514,276. With 274 homes in the subdivision, the property sits in the upper tier. Note that values in this subdivision declined 8.7% over the past year.

R550600D - Forest Creek Sec 15,16,19,31

above average
274 Properties
$514,276 Median Value
-8.7% YoY Change
0% Have Pool
99% Have Garage
This Home
$610,343
Median
$514,276

This home is +18.7% above the subdivision median.

Tax Analysis

The estimated annual property tax is $10,982 across all districts. With a homestead exemption claimed, that drops to $9,619 — saving $1,363 per year. That's $802 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%$5,451
Round RockCity0.3720%$2,270
Williamson CountyCounty0.3694%$2,255
Austin Community Collegespecial0.1034%$631
Williamson County FM/RdCounty0.0443%$271
Upper Brushy Creek WCIDWater0.0170%$104
Williamson Central Appraisal Districtcad0.0000%$0
Total Annual Tax1.7993%$10,982

Mortgage Context

At today's 30-year mortgage rate of 6.38%, a buyer financing $548,453 would pay approximately $3,423 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