1230 Shell Ave is a 1,154 square foot house on a 4,920 square foot lot with 3 bedrooms and 2 bathrooms. - it last sold on December 19, 1977 for $42,500. Based on Redfin's Martinez data, we estimate the home's value is $627,248.
Single-familyProperty Type
1940Year Built
4,920 sq ftLot Size
$544Est. Price/Sq.Ft.
Source:Public Records
Redfin Estimate
$627,248
$585K since sold in December 1977$6,000 since August
Recently sold homes
Estimate history
Homes for sale
This home's estimate is 4.6% lower than the average sale price ($658K) 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
Apr 2, 2020 • Final
Building/residential/ad/single family addition
Construct an addition to the entry of the existing residence, including a bedroom and a bathroom.
Addition
Feb 8, 2011 • Final
Building - residential plumbing
Replace an old galvanized water service line with new copper piping.
Plumbing
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: 6
Exterior
Property Information
Subdivision Name: MARTINEZ LAND CO #4
Living Sq. Ft: 1,154
Ground Floor Sq. Ft: 1,154
Building Sq. Ft: 1,154
# of Stories: 1
Legal Description: MARTINEZ LAND #4 LOT 5 BLK 12
Parking & Garage Information
Garage/Parking Sq. Ft: 235
Lot Information
# of Buildings: 1
Land Sq. Ft: 4,920
Legal Lot Number: 5
Legal Block Number: 12
Acres: 0.1129
Zoning Code: R-6
County Use Description: SINGLE FAMILY
Financial
Assessor Information
Assessment Year: 2026
Public facts
Beds: 3
Baths: 2.0
Sq. Ft.: 1,154
Stories: 1.0
Lot Size: 4,920 square feet
Style: Single Family Residential
Year Built: 1940
Year Renovated: 1950
County: Contra Costa County
APN: 3751910021
Home facts updated by county records on Jul 13, 2026
Around this home
Schools
Morello Park Elementary School
Public K-5 • Assigned • 1.2mi
9/10
Martinez Junior High School
Public 6-8 • Assigned • 0.7mi
7/10
Alhambra Senior High School
Public 9-12 • Assigned • 0.9mi
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
4/10 Fire Factor
2% chance of being in a wildfire in next 30 years
4/10 Heat Factor
7 days above 97° expected this year, 15 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
62
45
70
49
70
49
77
53
80
55
80
56
87
59
84
59
78
56
64
49
56
46
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
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
$596,000 – $722,000
Reach more buyers when you sell with Redfin. Save up to $6,272 in fees.3 minutes to get started.