21 Alan Way is a 1,398 square foot house on a 10,200 square foot lot with 3 bedrooms and 1 bathroom. - it last sold on July 17, 2001 for $152,500. Based on Redfin's Martinez data, we estimate the home's value is $609,315.
Single-familyProperty Type
1951Year Built
10,200 sq ftLot Size
$436Est. Price/Sq.Ft.
Source:Public Records
Redfin Estimate
$609,315
$457K since sold in July 2001$2,000 since October
Recently sold homes
Estimate history
Homes for sale
This home's estimate is 2% lower than the average sale price ($622K) 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
Jan 30, 2010 • Final
Building/residential/rp/repair
Perform an alteration on a bathroom.
Bathroom
Remodel
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: HELMOND SHEPARD
Living Sq. Ft: 1,398
Ground Floor Sq. Ft: 1,398
Building Sq. Ft: 1,398
# of Stories: 1
Legal Description: HELMOND SHEPARD TRACT LOT 21
Parking & Garage Information
Garage/Parking Sq. Ft: 120
Lot Information
# of Buildings: 1
Land Sq. Ft: 10,200
Legal Lot Number: 21
Acres: 0.2342
Zoning Code: R-7
County Use Description: SINGLE FAMILY
Financial
Assessor Information
Assessment Year: 2026
Public facts
Beds: 3
Baths: 1.0
Sq. Ft.: 1,398
Stories: 1.0
Lot Size: 10,200 square feet
Style: Single Family Residential
Year Built: 1951
Year Renovated: 1953
County: Contra Costa County
APN: 1591630049
Home facts updated by county records on Oct 30, 2026
Around this home
Schools
K - 12
Preschool & daycare
Hidden Valley Elementary School
Public K-5 • Assigned • 1.7mi
7/10
Valley View Middle School
Public 6-8 • Assigned • 2.7mi
8/10
College Park High School
Public 9-12 • Assigned • 2.7mi
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
62
45
70
49
70
49
77
53
80
55
83
57
87
59
83
61
74
54
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
$579,000 – $701,000
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