5300 Costa Ct, Antioch, CA 94531 Property Records

Contra Costa County property record for 5300 Costa Ct, Antioch, CA 94531

Property Summary

Property Type	Single Family Home
Details	5 bd · 3.5 ba · 3,668 sqft · built 2022
Lot Size	0.319 acres (13,880 sqft)
Owner	2 Individual Names on File
Last Sale	$925,000 (Apr 2023)
Tax Bill	$11,982 (2025)
Deeds & Mortgages	Apr 2023 Sale & Mortgage Nov 2022 Sale
Flood Zone	Zone X (minimal risk)
APN	`057-150-086-7`

Property Details

APN / Parcel Number

Primary APN	`057-150-086-7`
Alternative APN	`057-150-086`

Interior

Bedrooms	5 Beds
Full Baths	3.5 Baths
Half Baths	1 Half Bath
Total Rooms	14 Rooms
Stories	2 Stories
Building Area	3,668 sqft Living Area
1st Floor Area	1,911 sqft
2nd Floor Area	1,757 sqft

Exterior

Year Built	Built 2022
Effective Year Built	Effective 2023
Lot Area	13,880 sqft (0.319 acres)
Garage Type	Attached
Garage Area	776 sqft
Parking Spaces	3 Parking Spaces

Utilities, Heating & Cooling

Cooling System	Central

Location & Zoning

Street Address	5300 COSTA CT
City	ANTIOCH
State	CA
Zip	94531-5027
Property Category	Residential
Property Type	Residential > Single Family > Home
Legal Description	T9449 L331
Legal Subdivision	SUBDIVISION 9449 AVIANO PH 2
Legal Tract	9449
Jurisdiction	CONTRA COSTA CA
Township / Civil Division	EAST CONTRA COSTA
Census Block Group	2
Census Block	2016
Census Tract	303207

Historic Designation

Source: NPS National Register of Historic Places, as of August 1, 2026

Historic District	Within the Shannon-Williamson Ranch listed 1987 · 12 contributing resources · NRIS 87000003

Federal listing alone does not restrict alterations; local historic district rules, which this data does not cover, may apply.

Owner

5300 Costa Ct is owned and occupied by two individuals who bought it in April 2023.

Source: Contra Costa County records, as of July 14, 2026

Owner of Record	2 Individual Names on File
Mailing Address	5300 COSTA CT, ANTIOCH, CA 94531-5027
Occupancy	Owner Occupied
Owner Type	Individual
Vesting	Joint Tenants

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

Date	Document
Apr 12, 2023	Grant Deed, Subdivision Related Transfer · Conventional Mortgage STAR ONE CU
Nov 21, 2022	Grant Deed, Transfer LENNAR TITLE INC

Assessor's Deed Record

Deed Names	2 Names on Deed
Last Sale	Apr 12, 2023 · Amount on File
Deed Sale	Apr 12, 2023 · Amount on File
Deed Document Number	202333930
Record Updated	Sep 20, 2026

April 2023: Grant Deed, Subdivision Related Transfer

Document Type	Grant Deed
Jurisdiction	CONTRA COSTA CA
Recording Date	Apr 12, 2023
Property Address	5300 COSTA CT, ANTIOCH, CA 94531-5027
Document Number	0000033930
Map Reference	MB 544 PG 21-36
Instrument Date	Mar 29, 2023
Instrument	2023-033930
Transaction Type	Subdivision Related Transfer
Record Updated	Aug 1, 2023
Title Company	LENNAR TITLE INC

Transaction

Amount	Amount on Record
Downpayment	Downpayment on Record
Loan-to-Value (LTV)	LTV on Record
Tax	$0.00
Amount Accuracy	Rounded by County
Additional	Arm's Length

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Joint Tenants
Address	5300 COSTA CT, ANTIOCH, CA 94531-5027

Mortgage

Document Number	0000033931
Date	Apr 12, 2023
Instrument	2023-033931

Lender

Name	STAR ONE CU
Type	Credit Union

Agreement

Type	Conventional Mortgage
Amount	Amount on Record
Term	361 Months
Due	May 1, 2053

Interest

Rate Type	Adjustable Rate
Rate	5.25%
Type Change Date	May 1, 2026
Change Frequency	Annually
Min Rate At Change	3.25%
Max Rate At Change	7.25%
Index	1-Year T-Bill
Max Rate	10.2%

November 2022: Grant Deed, Transfer

Document Type	Grant Deed
Jurisdiction	CONTRA COSTA CA
Recording Date	Nov 21, 2022
Property Address	5300 COSTA CT, ANTIOCH, CA 94531-5027
Document Number	0000175811
Instrument Date	Nov 17, 2022
Instrument	2022-175811
Transaction Type	Transfer
Record Updated	Aug 1, 2023
Title Company	LENNAR TITLE INC

Transaction

Amount	Amount on Record
Tax	$0.00
Amount Accuracy	Rounded by County
Additional	Arm's Length Multiple Parcels

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Address	2603 CAMINO RAMON STE 525, 525, SAN RAMON, CA 94583-9131

Tax Assessment & Valuation

The 2025 property tax bill for 5300 Costa Ct was $11,982 with a homeowner's exemption.

Source: Contra Costa County assessment roll, as of July 14, 2026

Property Jurisdictions

Type	Name
State	California
County	Contra Costa County
Municipality	Antioch City
Unified School District	Antioch Unified School District (KG - 12)

Tax Bill & Assessment History

Year	Tax Bill	Assessed Value
2026		$981,085 (+2%) Land $233,465 Building $747,620
2025	$11,982.00 Homeowner's exemption	$961,849 Land $228,888 Building $732,961
2023	$5,590.00 (+196.24%)	$405,600 Land $191,700 Building $213,900
2022	$1,887.00

Assessed value and assessed market value are set for property tax purposes, not market price estimates; both are a fraction of this property's market value.

Flood

FEMA maps place 5300 Costa Ct in Zone X, an area of minimal flood risk.

Source: FEMA National Flood Hazard Layer, effective October 12, 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	2 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

Wildfire risk around 5300 Costa Ct is high, ranking above 78% of the US, with a 0.5% annual chance of wildfire.

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

Wildfire Risk	High above 78% of the US · above 55% of California
Wildfire Likelihood	0.5% annual chance
Exposure	Direct burnable vegetation

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 ANTIOCH serves 116,781 people · EPA ID CA0710001
Water Source	Surface water
Last State Inspection	Jan 2024
Lead	Under 1 ppb (2022–2024) action level 15 ppb

Violations Reported to EPA

Water Quality	None last 10 years
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.

Internet Providers

Source: FCC Broadband Data Collection, based on 331 locations within half a mile, as of December 31, 2025

Provider	Max Down / Up (Mbps)
AT&T Fiber	5,000 / 5,000
Xfinity Cable	2,000 / 250
Unwired Fixed Wireless	300 / 25

May also be available: Verizon.

Cell Coverage

5G (outdoors only) and 4G LTE

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