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

15504 FISHER ISLAND DR, AUSTIN, TX 78717

AUSTIN, 78717 — williamson County

3 bed2 bath2,541 sqftBuilt 2004

Property at a Glance

This home is estimated between $716,132 and $983,982, with a best estimate of $905,786. That places the property above the R251501D - Avery Ranch South median of $708,305, in a neighborhood that declined 3.8% over the past year.

Estimated Value Range

$716,132 $983,982
Best Estimate
$905,786
WCAD Value
$624,704
High Confidence

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

Based on 5 comparable properties in R251501D - Avery Ranch South, this home's estimated market value is between $716,132 and $983,982. All 5 comparables are in the same subdivision, giving this estimate high confidence.

Comparable Properties (5)

15508 FISHER ISLAND DR, AUSTIN, TX 78717
0.01 mi 100% similar Same subdivision
4 bed 2 bath 2,058 sqft Built 2005
Raw Value $737,575
Adjusted Value $905,786

Adjusted +$169,604 for 483 sqft more living space and -$1,393 for being older. Net adjustment: +$168,211.

15509 WHISTLING STRAITS DR, AUSTIN, TX 78717
0.02 mi 100% similar Same subdivision
4 bed 2 bath 2,350 sqft Built 2003
Raw Value $647,670
Adjusted Value $716,132

Adjusted +$67,069 for 191 sqft more living space and +$1,393 for being newer. Net adjustment: +$68,462.

15501 WHISTLING STRAITS DR, AUSTIN, TX 78717
0.02 mi 100% similar Same subdivision
4 bed 2 bath 1,804 sqft Built 2003
Raw Value $723,794
Adjusted Value $983,982

Adjusted +$258,795 for 737 sqft more living space and +$1,393 for being newer. Net adjustment: +$260,188.

15436 FISHER ISLAND DR, AUSTIN, TX 78717
0.03 mi 100% similar Same subdivision
4 bed 2 bath 1,875 sqft Built 2004
Raw Value $725,265
Adjusted Value $959,129

Adjusted +$233,864 for 666 sqft more living space. Net adjustment: +$233,864.

15516 FISHER ISLAND DR, AUSTIN, TX 78717
0.04 mi 100% similar Same subdivision
4 bed 3 bath 2,492 sqft Built 2004
Raw Value $738,290
Adjusted Value $755,496

Adjusted +$17,206 for 49 sqft more living space. Net adjustment: +$17,206.

The Neighborhood

This home is valued 11.8% below the R251501D - Avery Ranch South median of $708,305. That positions it competitively for buyers comparing within the neighborhood. Note that values in this subdivision declined 3.8% over the past year.

R251501D - Avery Ranch South

typical
635 Properties
$708,305 Median Value
-3.8% YoY Change
1% Have Pool
100% Have Garage
This Home
$624,704
Median
$708,305

This home is -11.8% below the subdivision median.

Tax Analysis

The estimated annual property tax is $12,190 across all districts. With a homestead exemption claimed, that drops to $10,169 — saving $2,021 per year. That's $847 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%$5,579
AustinCity0.5240%$3,274
Williamson CountyCounty0.3694%$2,308
Austin Community Collegespecial0.1034%$646
Williamson County FM/RdCounty0.0443%$277
Upper Brushy Creek WCIDWater0.0170%$106
Road District (R02)Road0.0000%$0
Williamson Central Appraisal Districtcad0.0000%$0
Total Annual Tax1.9513%$12,190

Mortgage Context

At today's 30-year mortgage rate of 6.38%, a buyer financing $905,786 would pay approximately $5,654 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