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3912 OBSIDIAN LN, ROUND ROCK, TX 78681

ROUND ROCK, 78681 — williamson County

4 bed3 bath2,439 sqftBuilt 2007

Property at a Glance

This home is estimated between $871,942 and $1,054,642, with a best estimate of $916,507. That places the property below the R147606C - WALSH RANCH median of $933,667, in a neighborhood that declined 4.6% over the past year.

Estimated Value Range

$871,942 $1,054,642
Best Estimate
$916,507
WCAD Value
$977,919
Low Confidence

Based on 5 comparable properties(1 in the same subdivision)

There are 5 comparable properties within range, but few are in R147606C - WALSH RANCH. The estimated range of $871,942 and $1,054,642 should be treated as a rough guide.

Comparable Properties (5)

3323 MARCASITE DR, ROUND ROCK, TX 78681
0.00 mi 100% similar Same subdivision
4 bed 3 bath 2,219 sqft Built 2007
Raw Value $904,649
Adjusted Value $994,107

Adjusted +$89,458 for 220 sqft more living space. Net adjustment: +$89,458.

4 bed 3 bath 2,154 sqft Built 2001
Raw Value $860,722
Adjusted Value $893,239

Adjusted +$115,888 for 285 sqft more living space and -$83,371 for being older. Net adjustment: +$32,517.

4 bed 3 bath 1,916 sqft Built 2014
Raw Value $562,011
Adjusted Value $871,942

Adjusted +$212,665 for 523 sqft more living space and +$97,266 for being newer. Net adjustment: +$309,931.

4 bed 3 bath 1,916 sqft Built 2016
Raw Value $578,786
Adjusted Value $916,507

Adjusted +$212,665 for 523 sqft more living space and +$125,056 for being newer. Net adjustment: +$337,721.

4 bed 3 bath 1,811 sqft Built 2014
Raw Value $702,015
Adjusted Value $1,054,642

Adjusted +$255,361 for 628 sqft more living space and +$97,266 for being newer. Net adjustment: +$352,627.

The Neighborhood

This home is valued 4.7% above the R147606C - WALSH RANCH median of $933,667. With 239 homes in the subdivision, the property sits in the upper tier. Note that values in this subdivision declined 4.6% over the past year.

R147606C - WALSH RANCH

typical
239 Properties
$933,667 Median Value
-4.6% YoY Change
0% Have Pool
100% Have Garage
This Home
$977,919
Median
$933,667

This home is +4.7% above the subdivision median.

Tax Analysis

The estimated annual property tax is $17,593 across all districts. With a homestead exemption claimed, that drops to $16,170 — saving $1,423 per year. That's $1,348 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%$8,390
Williamson CountyCounty0.3694%$3,471
Walsh Ranch MUDMUD0.3455%$3,246
Austin Community Collegespecial0.1034%$971
Williamson County ESD #2 - Sam Bass VFDESD0.1000%$939
Williamson County FM/RdCounty0.0443%$416
Upper Brushy Creek WCIDWater0.0170%$160
Williamson Central Appraisal Districtcad0.0000%$0
Total Annual Tax1.8728%$17,593

Mortgage Context

At today's 30-year mortgage rate of 6.38%, a buyer financing $916,507 would pay approximately $5,721 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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