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

15309 WHISTLING STRAITS DR, AUSTIN, TX 78717

AUSTIN, 78717 — williamson County

4 bed2 bath1,994 sqftBuilt 2003

Property at a Glance

This home is estimated between $380,007 and $993,135, with a best estimate of $715,670. 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

$380,007 $993,135
Best Estimate
$715,670
WCAD Value
$805,999
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 $380,007 and $993,135. All 5 comparables are in the same subdivision, giving this estimate high confidence.

Comparable Properties (5)

15313 WHISTLING STRAITS DR, AUSTIN, TX 78717
0.02 mi 100% similar Same subdivision
4 bed 2 bath 3,098 sqft Built 2002
Raw Value $766,281
Adjusted Value $380,007

Adjusted -$387,667 for 1,104 sqft less living space and +$1,393 for being newer. Net adjustment: -$386,274.

15308 VALDERRAMA CT, AUSTIN, TX 78717
0.03 mi 100% similar Same subdivision
6 bed 3 bath 1,789 sqft Built 2003
Raw Value $921,150
Adjusted Value $993,135

Adjusted +$71,985 for 205 sqft more living space. Net adjustment: +$71,985.

15312 WHISTLING STRAITS DR, AUSTIN, TX 78717
0.03 mi 100% similar Same subdivision
4 bed 2 bath 1,572 sqft Built 2003
Raw Value $741,073
Adjusted Value $889,257

Adjusted +$148,184 for 422 sqft more living space. Net adjustment: +$148,184.

15312 VALDERRAMA CT, AUSTIN, TX 78717
0.03 mi 100% similar Same subdivision
4 bed 3 bath 2,367 sqft Built 2003
Raw Value $753,766
Adjusted Value $622,788

Adjusted -$130,978 for 373 sqft less living space. Net adjustment: -$130,978.

15304 WHISTLING STRAITS DR, AUSTIN, TX 78717
0.04 mi 100% similar Same subdivision
4 bed 2 bath 2,218 sqft Built 2003
Raw Value $794,327
Adjusted Value $715,670

Adjusted -$78,657 for 224 sqft less living space. Net adjustment: -$78,657.

The Neighborhood

This home is valued 13.8% above the R251501D - Avery Ranch South median of $708,305. With 635 homes in the subdivision, the property sits in the upper tier. 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
$805,999
Median
$708,305

This home is +13.8% above the subdivision median.

Tax Analysis

The estimated annual property tax is $15,727 across all districts. With a homestead exemption claimed, that drops to $13,483 — saving $2,244 per year. That's $1,124 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%$7,198
AustinCity0.5240%$4,224
Williamson CountyCounty0.3694%$2,978
Austin Community Collegespecial0.1034%$833
Williamson County FM/RdCounty0.0443%$357
Upper Brushy Creek WCIDWater0.0170%$137
Road District (R02)Road0.0000%$0
Williamson Central Appraisal Districtcad0.0000%$0
Total Annual Tax1.9513%$15,727

Mortgage Context

At today's 30-year mortgage rate of 6.38%, a buyer financing $715,670 would pay approximately $4,467 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