520 Arthur Rd is a 970 square foot house on a 8,276 square foot lot with 3 bedrooms and 2 bathrooms. - it last sold on December 27, 2024 for $325,000. Based on Redfin's Martinez data, we estimate the home's value is $591,382.
Single-familyProperty Type
1940Year Built
8,276 sq ftLot Size
$610Est. Price/Sq.Ft.
1 car garageParking
Source:Public Records
Redfin Estimate
$591,382
$266K since sold in December 2024$0 since August
Recently sold homes
Estimate history
Homes for sale
This home's estimate is 5.7% higher than the average sale price ($560K) of 6 comparable homes.
*Taxable value of land and structures on it ("additions") is determined regularly by local assessors and does not affect market price.
Permits
Jul 18, 2025 • Final
Building - residential electrical
Upgrade the electrical service from a 100 amp main panel to a 200 amp electrical panel.
Electrical
May 14, 2025 • Active
Building - residential re-roof
Install a new roof on a detached accessory dwelling unit to match the existing roof. A cool roof or cool roof exception is required at the final inspection.
ADU
Roofing
Permit history is from public records and may be incomplete or inaccurate. Redfin and its agents make no representations about the property condition or permit status. Buyers should independently verify all information.
Property details
Interior
Room Information
# of Rooms: 7
Exterior
Property Information
Subdivision Name: LAS JUNTAS RHO
Living Sq. Ft: 970
Ground Floor Sq. Ft: 970
Building Sq. Ft: 970
# of Stories: 1
Legal Description: POR RO LAS JUNTAS
Parking & Garage Information
Garage/Parking Sq. Ft: 300
Lot Information
# of Buildings: 1
Land Sq. Ft: 8,276
Acres: 0.19
Zoning Code: R-6
County Use Description: SINGLE FAMILY
Financial
Assessor Information
Assessment Year: 2026
Public facts
Beds: 3
Baths: 2.0
Sq. Ft.: 970
Stories: 1.0
Lot Size: 8,276 square feet
Style: Single Family Residential
Year Built: 1940
Year Renovated: 1940
County: Contra Costa County
APN: 3801200456
Home facts updated by county records on Jul 28, 2026
Around this home
Schools
Las Juntas Elementary School
Public K-5 • Assigned • 0.6mi
5/10
Martinez Junior High School
Public 6-8 • Assigned • 2.2mi
7/10
Alhambra Senior High School
Public 9-12 • Assigned • 2.5mi
8/10
Provided by GreatSchools
Lifestyle
Provided by Walk Score and Local Logic
Climate risks
1/10 Flood Factor
Minimal risk of a flood reaching the building in the next 30 years
2/10 Fire Factor
0.00% chance of being in a wildfire in next 30 years
4/10 Heat Factor
7 days above 98° expected this year, 14 days in 30 years
1/10 Wind Factor
Minimal risk of severe winds over next 30 years
8/10 Air Factor
13 unhealthy days expected this year, 13 days in 30 years
Provided by First Street
Historical weather
Martinez, CA • 94553
Average low and high temperatures (°F)
60
43
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87
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84
59
78
56
64
49
56
46
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Sun exposure
In this area, properties receive around 11.8 hours in
June and 4.8 hours in December, placing it above the
U.S. average for solar exposure.
11.8 hrs
4.8 hrs
JuneDecember
Provided by Shadowmap
Estimated sale price
$562,000 – $681,000
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