16300 Castletroy Dr, Austin, TX 78717 Property Records

Williamson County property record for 16300 Castletroy Dr, Austin, TX 78717

Property Summary

Property Type	Single Family Home
Details	2 ba · 2,517 sqft · built 2003
Lot Size	0.15 acres (6,540 sqft)
Owner	2 Individual Names on File
Last Sale	$515,300 (Aug 2020)
Tax Bill	$9,432 (2025)
Deeds & Mortgages	Aug 2020 Mortgage
Flood Zone	Zone X (minimal risk)
APN	`R-16-3020-000A-0019`

Property Details

APN / Parcel Number

Primary APN	`R-16-3020-000A-0019`
Alternative APNs	`R411851` `223959`

Interior

Full Baths	2 Baths
Stories	2 Stories
Building Area	2,517 sqft Living Area
1st Floor Area	1,229 sqft
2nd Floor Area	1,288 sqft
Flooring	Carpet
Interior Walls	Wallboard/Drywall

Exterior

Year Built	Built 2003
Effective Year Built	Effective 2003
Exterior Material	Brick Veneer
Roof Material	Other
Lot Area	6,540 sqft (0.15 acres)
Garage Area	380 sqft
Parking Spaces	1 Parking Space
Porch	Open Porch
Porch Area	304 sqft

Utilities, Heating & Cooling

Cooling System	Central
Heating System	Central

Location & Zoning

Account Number	R163020000A0019
Street Address	16300 CASTLETROY DR
City	AUSTIN
State	TX
Zip	78717-5522
Property Category	Residential
Property Type	Residential > Single Family > Home
Legal Description	S7676 - AVERY RANCH EAST PH 1, BLOCK A, LOT 19
Legal Subdivision	AVERY RANCH EAST PH 1
Legal Phase	1
Legal Block	A
Legal Lot Number	19
Jurisdiction	WILLIAMSON TX
Township / Civil Division	ROUND ROCK-GEORGETOWN
Census Block Group	4
Census Block	4008
Census Tract	20509

Owner

16300 Castletroy Dr is owned and occupied by two individuals who bought it in August 2020.

Source: Williamson County records, as of September 11, 2026

Owner of Record	2 Individual Names on File
Mailing Address	16300 CASTLETROY DR, AUSTIN, TX 78717-5522
Occupancy	Owner Occupied
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.

Deeds, Mortgages & Sale History

Assessor's Deed Record

Deed Names	2 Names on Deed
Last Sale	Aug 31, 2020 · Amount on File
Deed Sale	Aug 31, 2020 · Amount on File
Prior Sale	Jul 26, 2011
Deed Document Number	2020102236
Prior Transfer Date	Aug 27, 2020
Prior Transfer Doc	0000102236
Record Updated	Oct 29, 2026

August 2020: Vendor's Lien, Transfer

Document Type	Vendor's Lien
Jurisdiction	WILLIAMSON TX
Recording Date	Aug 31, 2020
Property Address	16300 CASTLETROY DR, AUSTIN, TX 78717-5522
Document Number	0000102236
Map Reference	CAB U SL 62
Instrument Date	Aug 27, 2020
Instrument	2020102236
Transaction Type	Transfer
Record Updated	Dec 6, 2021
Title Company	TEXAS NATIONAL TITLE

Transaction

Tax	$0.00
Additional	Arm's Length

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Address	16300 CASTLETROY DR, AUSTIN, TX 78717-5522

Mortgage

Document Number	0000102237
Date	Aug 31, 2020
Instrument	2020102237

Lender

Name	UNIVERSITY FCU
Type	Credit Union
Special Notes	Seller Financed

Agreement

Type	Conventional Mortgage
Amount	Amount on Record
Term	361 Months
Due	Sep 1, 2050

Tax Assessment & Valuation

The 2025 property tax bill for 16300 Castletroy Dr was $9,432 with a homeowner's exemption.

Source: Williamson County assessment roll, as of September 11, 2026

Property Jurisdictions

Type	Name
State	Texas
Municipality	Austin City
County	Williamson County
Unified School District	Round Rock Independent School District (PK - 12)

Tax Bill & Assessment History

Year	Tax Bill	Assessed Value	Assessed Market Value
2025	$9,432.00 Homeowner's exemption	$578,403 Land $137,800 Building $440,603	$578,403 Land $137,800 Building $440,603
2023	$8,403.00 (-4.88%) Homeowner's exemption	$554,771 Land $149,500 Building $405,271	$554,771 Land $149,500 Building $405,271
2022	$8,834.00

Assessed value and assessed market value are set for property tax purposes and are not market price estimates.

Flood

FEMA maps place 16300 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

The area around 16300 Castletroy Dr has no burnable land within ember reach, so its wildfire risk is not rated.

Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024

Wildfire Risk	Not rated no burnable land within ember reach

Values cover an area roughly 900 ft across, not the parcel itself; insurers use their own ratings.

Drinking Water

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

Violations Reported to EPA

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.

Internet Providers

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.