Williamson County property record for 16504 Castletroy Dr, Austin, TX 78717
| Property Type | Single Family Home |
|---|---|
| Details | 2 ba · 2,002 sqft · built 2003 |
| Lot Size | 0.133 acres (5,776 sqft) |
| Owner | 2 Individual Names on File |
| Last Sale | $253,900 (Mar 2015) |
| Tax Bill | $10,204 (2025) |
| Deeds & Mortgages | Oct 2020 Mortgage Oct 2020 Mortgage |
| Flood Zone | Zone X (minimal risk) |
| APN | R-16-3020-000A-0012 |
| Primary APN | R-16-3020-000A-0012 |
|---|---|
| Alternative APNs |
|
| Full Baths | 2 Baths |
|---|---|
| Stories | 1 Story |
| Building Area | 2,002 sqft Living Area |
| 1st Floor Area | 2,002 sqft |
| Flooring | Carpet |
| Interior Walls | Wallboard/Drywall |
| Year Built | Built 2003 |
|---|---|
| Effective Year Built | Effective 2003 |
| Exterior Material | Brick Veneer |
| Roof Type | Hip |
| Lot Area | 5,776 sqft (0.133 acres) |
| Garage Area | 399 sqft |
| Parking Spaces | 1 Parking Space |
| Porch | Open Porch |
| Porch Area | 239 sqft |
| Cooling System | Central |
|---|---|
| Heating System | Central |
| Account Number | R163020000A0012 |
|---|---|
| Street Address | 16504 CASTLETROY DR |
| City | AUSTIN |
| State | TX |
| Zip | 78717-5524 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Legal Description | AVERY RANCH EAST PH 1, BLOCK A, LOT 12 |
| Legal Subdivision | AVERY RANCH EAST PH 1 |
| Legal Phase | 1 |
| Legal Block | A |
| Legal Lot Number | 12 |
| Jurisdiction | WILLIAMSON TX |
| Township / Civil Division | ROUND ROCK-GEORGETOWN |
| Census Block Group | 4 |
| Census Block | 4008 |
| Census Tract | 20509 |
16504 Castletroy Dr is owned by two individuals who bought it in March 2015.
Source: Williamson County records, as of September 11, 2026
| Owner of Record | 2 Individual Names on File |
|---|---|
| Mailing Address | 4125 BISON BND, CEDAR PARK, TX 78613-3177 |
| Owner Type | Individual |
Owner names and exact recorded amounts are on file and can be viewed instantly on this page with a free 10-day trial.
| Date | Document |
|---|---|
| Oct 28, 2020 | Deed of Trust, Mortgage PRIVATE INDIVIDUAL |
| Oct 27, 2020 | Deed of Trust, Mortgage PRIVATE INDIVIDUAL |
| Deed Names | 2 Names on Deed |
|---|---|
| Last Sale | Mar 26, 2015 · Amount on File |
| Deed Sale | Mar 26, 2015 · Amount on File |
| Prior Sale | Jul 19, 2006 · Amount on File |
| Deed Document Number | 201522876 |
| Prior Transfer Date | Mar 23, 2015 |
| Prior Transfer Doc | 0000022876 |
| Record Updated | Oct 29, 2026 |
| Document Type | Deed of Trust |
|---|---|
| Jurisdiction | WILLIAMSON TX |
| Property Address | 16504 CASTLETROY DR, AUSTIN, TX 78717-5524 |
| Document Number | 0000138271 |
| Instrument Date | Oct 28, 2020 |
| Transaction Type | Mortgage |
| Record Updated | Nov 18, 2020 |
| Title Company | CONCIERGE TITLE INC |
| Name | Verified Name |
|---|---|
| Relationship | Husband and Wife |
| Address | 4125 BISON BND CEDAR PARK TX 786133177, CEDAR PARK, TX 78613-3177 |
| Document Number | 0000138271 |
|---|---|
| Date | Nov 5, 2020 |
| Instrument | 138271 |
| Name | PRIVATE INDIVIDUAL |
|---|---|
| Type | Private Party |
| Address | FRISCO, TX 75035 |
| Amount | Amount on Record |
|---|---|
| Term | 360 Months |
| Due | Nov 4, 2050 |
| Document Type | Deed of Trust |
|---|---|
| Jurisdiction | WILLIAMSON TX |
| Property Address | 16504 CASTLETROY DR, AUSTIN, TX 78717-5524 |
| Document Number | 0000136914 |
| Instrument Date | Oct 27, 2020 |
| Transaction Type | Mortgage |
| Record Updated | Nov 16, 2020 |
| Title Company | ATTORNEY ONLY |
| Name | Verified Name |
|---|---|
| Relationship | Husband and Wife |
| Address | 16504 CASTLETROY DR AUSTIN TX 787175524, AUSTIN, TX 78717-5524 |
| Document Number | 0000136914 |
|---|---|
| Date | Nov 3, 2020 |
| Instrument | 136914 |
| Name | PRIVATE INDIVIDUAL |
|---|---|
| Type | Private Party |
| Address | FRISCO, TX 75035 |
| Amount | Amount on Record |
|---|---|
| Term | 360 Months |
| Due | Nov 2, 2050 |
The 2025 property tax bill for 16504 Castletroy Dr was $10,204.
Source: Williamson County assessment roll, as of September 11, 2026
| Type | Name |
|---|---|
| State | Texas |
| Municipality | Austin City |
| County | Williamson County |
| Unified School District | Round Rock Independent School District (PK - 12) |
| Year | Tax Bill | Assessed Value | Assessed Market Value |
|---|---|---|---|
| 2025 | $10,204.00 | $513,729 Land $137,800 Building $375,929 | $513,729 Land $137,800 Building $375,929 |
| 2023 | $9,717.00 (-18.56%) | $514,183 Land $149,500 Building $364,683 | $514,183 Land $149,500 Building $364,683 |
| 2022 | $11,931.00 |
Assessed value and assessed market value are set for property tax purposes and are not market price estimates.
FEMA maps place 16504 Castletroy Dr in Zone X, an area of minimal flood risk.
Source: FEMA National Flood Hazard Layer, effective October 5, 2026 · OpenFEMA NFIP redacted claims and policies, as of September 2026
| FEMA Flood Zone | Zone X minimal risk |
|---|---|
| Flood Insurance Requirement | Not required lenders may require it |
| Nearby Flood Policies | 3 in force |
Values are read at the parcel center point; flood claims are located to the census block group, not this parcel; lenders make the official flood determination.
Wildfire risk around 16504 Castletroy Dr is low, with less than a 0.01% annual chance of wildfire.
Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024
| Wildfire Risk | Low lower than 99.8% of the US · lower than 99.8% of Texas |
|---|---|
| Wildfire Likelihood | Under 0.01% annual chance |
| Exposure | None beyond ember reach |
Values cover an area roughly 900 ft across, not the parcel itself; insurers use their own ratings.
Source: EPA Safe Drinking Water Information System, as of September 2026
| Water System | CITY OF AUSTIN WATER & WASTEWATER serves 1,115,323 people · EPA ID TX2270001 |
|---|---|
| Water Source | Surface water |
| Last State Inspection | Jul 2023 |
| Lead | Under 1 ppb (2022–2024) action level 15 ppb |
| Water Quality | Turbidity resolved · Feb 2022 |
|---|---|
| Treatment and Procedure | None last 10 years |
| Monitoring and Reporting | None last 3 years |
Results are for the whole water system, not water tested at this address; lead at the tap also depends on the building's own pipes. This system sells water to local utilities; the supplier billing this address may be one of them.
Source: FCC Broadband Data Collection, based on 489 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| Spectrum Cable | 1,000 / 1,000 |
| Google Fiber Fiber | 1,000 / 1,000 |
| Verizon Fixed Wireless | 300 / 20 |
| T-Mobile Fixed Wireless | 100 / 20 |
| AT&T Fixed Wireless · DSL · Fiber in parts of the area | 100 / 20 |
May also be available: Astound Broadband, VTX Communications, Western Broadband.
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