830 Shell Ave Unit A is a 1,097 square foot house on a 10,450 square foot lot with 2 bedrooms and 1 bathroom. Based on Redfin's Martinez data, we estimate the home's value is $593,371.
Single-familyProperty Type
1937Year Built
10,450 sq ftLot Size
$541Est. Price/Sq.Ft.
Source:Public Records
Redfin Estimate
$593,371
$4,000 since August
Recently sold homes
Estimate history
Homes for sale
This home's estimate is 2.1% higher than the average sale price ($581K) of 5 comparable homes.
As the MLS and public records start to fill up, we'll list the details here.
Year
Property tax
Land + Additions
Assessment*
2025
$5,464 (+4.2%)
$308,891 + $60,259
$369,150
2024
$5,242 (+2.9%)
$302,835 + $59,078
$361,913
2023
$5,094 (+2.9%)
$296,898 + $57,920
$354,818
2022
$4,951 (+4.2%)
$291,077 + $56,785
$347,862
2021
$4,753 (+2.3%)
$285,370 + $55,672
$341,042
2020
$4,645 (+2.3%)
$279,775 + $54,581
$334,356
2019
$4,540 (+3.2%)
$276,907 + $54,022
$330,929
2018
$4,401 (+1.4%)
$271,478 + $52,963
$324,441
2017
$4,339 (+7.2%)
$260,937 + $50,907
$311,844
2016
$4,047 (+0.8%)
$260,937 + $50,907
$311,844
2015
$4,016 (+10.1%)
$255,821 + $49,909
$305,730
2014
$3,647 (+14.4%)
$223,831 + $43,669
$267,500
2013
$3,188 (+10.0%)
$223,831 + $43,669
$267,500
2012
$2,899 (−10.7%)
$190,779 + $37,221
$228,000
2011
$3,248
$172,370 + $33,630
$206,000
2010
$3,250 (−5.6%)
$197,472 + $38,528
$236,000
2009
$3,444 (−2.4%)
$197,472 + $38,528
$236,000
2008
$3,530
$215,043 + $41,957
$257,000
Tax history for 830 Shell Ave Unit A
Year
Property tax
Land + Additions
Assessment*
2025
$5,464 (+4.2%)
$308,891 + $60,259
$369,150
2024
$5,242 (+2.9%)
$302,835 + $59,078
$361,913
2023
$5,094 (+2.9%)
$296,898 + $57,920
$354,818
2022
$4,951 (+4.2%)
$291,077 + $56,785
$347,862
2021
$4,753 (+2.3%)
$285,370 + $55,672
$341,042
2020
$4,645 (+2.3%)
$279,775 + $54,581
$334,356
2019
$4,540 (+3.2%)
$276,907 + $54,022
$330,929
2018
$4,401 (+1.4%)
$271,478 + $52,963
$324,441
2017
$4,339 (+7.2%)
$260,937 + $50,907
$311,844
2016
$4,047 (+0.8%)
$260,937 + $50,907
$311,844
2015
$4,016 (+10.1%)
$255,821 + $49,909
$305,730
2014
$3,647 (+14.4%)
$223,831 + $43,669
$267,500
2013
$3,188 (+10.0%)
$223,831 + $43,669
$267,500
2012
$2,899 (−10.7%)
$190,779 + $37,221
$228,000
2011
$3,248
$172,370 + $33,630
$206,000
2010
$3,250 (−5.6%)
$197,472 + $38,528
$236,000
2009
$3,444 (−2.4%)
$197,472 + $38,528
$236,000
2008
$3,530
$215,043 + $41,957
$257,000
*Taxable value of land and structures on it ("additions") is determined regularly by local assessors and does not affect market price.
Zoning
R-6.0
One Family Residential District
The R Residential Districts are included in the zoning regulations to achieve the following purposes: Reserve appropriately located areas tar residential living in a variety of types of dwellings, at a reasonable range of population densities consistent with sound standards of public health and safety; Ensure adequate light, air and privacy for each dwelling unit; Provide adequate amounts of private open space in proximity to each dwelling unit; Provide space for community facilities needed to complement urban residential areas; Provide space for institutions which require a residential environment; Minimize traffic congestion and to avoid the overloading of utilities by preventing the construction of buildings of excessive size in relation to the land around them; Provide necessary space for off-street parking of automobiles and, where appropriate for off-street loading of trucks; Protect residential properties from the hazs, noise and congestion created by commercial and industrial traffic; Protect residential properties from noise, illumination, unsightliness, odors, dust, dirt, smoke, vibration, heat, glare and other objectionable influences; Protect residential properties from fire, explosion, noxious fumes and other hazards.
Permitted uses
Include but are not limited to:
Agriculture
Agriculture-Other
Housing-Group
Housing-Single unit
Housing-Multiple units
Housing-Senior
Housing-Other
Property details
Interior
Room Information
# of Rooms: 6
Exterior
Property Information
Subdivision Name: RANCHO LAS JUNTAS
Living Sq. Ft: 1,097
Ground Floor Sq. Ft: 1,097
Building Sq. Ft: 1,097
# of Stories: 1
Legal Description: POR RO LAS JUNTAS
Parking & Garage Information
Garage/Parking Sq. Ft: 458
Lot Information
# of Buildings: 1
Land Sq. Ft: 10,450
Acres: 0.2399
County Use Description: SINGLE FAMILY
Financial
Assessor Information
Assessment Year: 2026
Public facts
Beds: 2
Baths: 1.0
Sq. Ft.: 1,097
Stories: 1.0
Lot Size: 10,450 square feet
Style: Single Family Residential
Year Built: 1937
Year Renovated: 1937
County: Contra Costa County
APN: 3751110101
Home facts updated by county records on Jul 13, 2026
Around this home
Schools
John Muir Elementary School
Public K-5 • Assigned • 0.5mi
6/10
Martinez Junior High School
Public 6-8 • Assigned • 0.6mi
7/10
Alhambra Senior High School
Public 9-12 • Assigned • 0.6mi
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
5/10 Fire Factor
3% 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
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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
$564,000 – $683,000
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