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4000 LORD BYRON CIR, ROUND ROCK, TX 78664

ROUND ROCK, 78664 — williamson County

5 bed4 bath2,361 sqftBuilt 2000

Property at a Glance

This home is estimated between $451,074 and $752,778, with a best estimate of $638,834. 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

$451,074 $752,778
Best Estimate
$638,834
WCAD Value
$593,528
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 $451,074 and $752,778. All 5 comparables are in the same subdivision, giving this estimate high confidence.

Comparable Properties (5)

4008 LORD BYRON CIR, ROUND ROCK, TX 78664
0.00 mi 100% similar Same subdivision
5 bed 3 bath 2,036 sqft Built 2000
Raw Value $545,849
Adjusted Value $638,834

Adjusted +$92,985 for 325 sqft more living space. Net adjustment: +$92,985.

3995 LORD BYRON CIR, ROUND ROCK, TX 78664
0.00 mi 100% similar Same subdivision
3 bed 2 bath 2,374 sqft Built 2002
Raw Value $458,723
Adjusted Value $451,074

Adjusted -$3,719 for 13 sqft less living space and -$3,930 for being older. Net adjustment: -$7,649.

3955 LORD BYRON CIR, ROUND ROCK, TX 78664
0.00 mi 100% similar Same subdivision
6 bed 3 bath 1,816 sqft Built 2000
Raw Value $508,354
Adjusted Value $664,282

Adjusted +$155,928 for 545 sqft more living space. Net adjustment: +$155,928.

3988 LORD BYRON CIR, ROUND ROCK, TX 78664
0.00 mi 100% similar Same subdivision
5 bed 4 bath 1,611 sqft Built 2000
Raw Value $538,198
Adjusted Value $752,778

Adjusted +$214,580 for 750 sqft more living space. Net adjustment: +$214,580.

3989 LORD BYRON CIR, ROUND ROCK, TX 78664
0.00 mi 100% similar Same subdivision
3 bed 2 bath 2,368 sqft Built 2001
Raw Value $456,612
Adjusted Value $452,644

Adjusted -$2,003 for 7 sqft less living space and -$1,965 for being older. Net adjustment: -$3,968.

The Neighborhood

This home is valued 15.4% 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
$593,528
Median
$514,276

This home is +15.4% above the subdivision median.

Tax Analysis

The estimated annual property tax is $10,679 across all districts. With a homestead exemption claimed, that drops to $9,319 — saving $1,360 per year. That's $777 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%$5,301
Round RockCity0.3720%$2,208
Williamson CountyCounty0.3694%$2,193
Austin Community Collegespecial0.1034%$614
Williamson County FM/RdCounty0.0443%$263
Upper Brushy Creek WCIDWater0.0170%$101
Williamson Central Appraisal Districtcad0.0000%$0
Total Annual Tax1.7993%$10,679

Mortgage Context

At today's 30-year mortgage rate of 6.38%, a buyer financing $638,834 would pay approximately $3,988 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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