20 Washington St is a 1,128 square foot house on a 5,000 square foot lot with 3 bedrooms and 1 bathroom. - it last sold on April 30, 1997 for $45,000. Based on Redfin's Bay Point data, we estimate the home's value is $317,675.
Single-familyProperty Type
1946Year Built
5,000 sq ftLot Size
$282Est. Price/Sq.Ft.
1 car garageParking
Source:Public Records
Redfin Estimate
$317,675
$273K since sold in April 1997$9,000 since October
Recently sold homes
Estimate history
Homes for sale
This home's estimate is 37% lower than the average sale price ($504K) of 6 comparable homes.
bridgeMLS, Bay East AOR, or Contra Costa AOR #27233651
Mar 27, 1997
Listing Removed
—
Year
Property tax
Land + Additions
Assessment*
2026
$1,774 (+4.8%)
$49,820 + $24,902
$74,722
2025
$1,692 (+4.7%)
$49,820 + $24,902
$74,722
2024
$1,616 (+2.8%)
$48,844 + $24,414
$73,258
2023
$1,572 (+0.4%)
$47,887 + $23,936
$71,823
2022
$1,565 (+2.8%)
$46,949 + $23,467
$70,416
2021
$1,522 (+2.4%)
$46,029 + $23,007
$69,036
2020
$1,486 (+1.7%)
$45,127 + $22,556
$67,683
2019
$1,461 (+3.1%)
$44,665 + $22,325
$66,990
2018
$1,417 (+3.4%)
$43,790 + $21,888
$65,678
2017
$1,370 (+4.2%)
$42,091 + $21,039
$63,130
2016
$1,315 (+2.1%)
$42,091 + $21,039
$63,130
2015
$1,288 (+2.7%)
$41,266 + $20,627
$61,893
2014
$1,254 (+3.0%)
$39,851 + $19,920
$59,771
2013
$1,218 (+2.8%)
$39,851 + $19,920
$59,771
2012
$1,185 (+4.1%)
$39,671 + $19,830
$59,501
2011
$1,139 (+2.4%)
$38,894 + $19,442
$58,336
2010
$1,112 (+1.4%)
$38,132 + $19,061
$57,193
2009
$1,096 (+2.7%)
$37,848 + $18,919
$56,767
2008
$1,067
$37,938 + $18,964
$56,902
Tax history for 20 Washington St
Year
Property tax
Land + Additions
Assessment*
2026
$1,774 (+4.8%)
$49,820 + $24,902
$74,722
2025
$1,692 (+4.7%)
$49,820 + $24,902
$74,722
2024
$1,616 (+2.8%)
$48,844 + $24,414
$73,258
2023
$1,572 (+0.4%)
$47,887 + $23,936
$71,823
2022
$1,565 (+2.8%)
$46,949 + $23,467
$70,416
2021
$1,522 (+2.4%)
$46,029 + $23,007
$69,036
2020
$1,486 (+1.7%)
$45,127 + $22,556
$67,683
2019
$1,461 (+3.1%)
$44,665 + $22,325
$66,990
2018
$1,417 (+3.4%)
$43,790 + $21,888
$65,678
2017
$1,370 (+4.2%)
$42,091 + $21,039
$63,130
2016
$1,315 (+2.1%)
$42,091 + $21,039
$63,130
2015
$1,288 (+2.7%)
$41,266 + $20,627
$61,893
2014
$1,254 (+3.0%)
$39,851 + $19,920
$59,771
2013
$1,218 (+2.8%)
$39,851 + $19,920
$59,771
2012
$1,185 (+4.1%)
$39,671 + $19,830
$59,501
2011
$1,139 (+2.4%)
$38,894 + $19,442
$58,336
2010
$1,112 (+1.4%)
$38,132 + $19,061
$57,193
2009
$1,096 (+2.7%)
$37,848 + $18,919
$56,767
2008
$1,067
$37,938 + $18,964
$56,902
*Taxable value of land and structures on it ("additions") is determined regularly by local assessors and does not affect market price.
Zoning
P-1
Planned Unit District
A large-scale integrated development or a general plan special area of concern provides an opportunity for, and requires cohesive design when flexible regulations are applied; whereas the application of conventional regulation, designed primarily for individual lot development, to a large-scale development or special area may create a monotonous and inappropriate neighborhood. The planned unit district is intended to allow diversification in the relationship of various uses, buildings, structures, lot sizes and open space while insuring substantial compliance with the general plan and the intent of the county code in requiring adequate standards necessary to satisfy the requirements of the public health, safety and general welfare. These standards shall be observed without unduly inhibiting the advantages of large-scale site or special area planning.
Permitted uses
Include but are not limited to:
Housing-Single unit
Property details
Interior
Room Information
# of Rooms: 7
Exterior
Property Information
Subdivision Name: JOSEPH SIINO SUB
Living Sq. Ft: 1,128
Ground Floor Sq. Ft: 1,128
Building Sq. Ft: 1,128
# of Stories: 1
Legal Description: JOSEPH SIINO SUBN LOT 2 BLK 3
Parking & Garage Information
Garage/Parking Sq. Ft: 252
Lot Information
# of Buildings: 1
Land Sq. Ft: 5,000
Legal Lot Number: 2
Legal Block Number: 3
Acres: 0.1148
Zoning Code: P-1
County Use Description: SINGLE FAMILY
Financial
Assessor Information
Assessment Year: 2026
Public facts
Beds: 3
Baths: 1.0
Sq. Ft.: 1,128
Stories: 1.0
Lot Size: 5,000 square feet
Style: Single Family Residential
Year Built: 1946
Year Renovated: 1946
County: Contra Costa County
APN: 0950320077
Home facts updated by county records on Oct 30, 2026
Around this home
Schools
K - 12
Preschool & daycare
Bel Air Elementary School
Public K-5 • Assigned • 0.4mi
1/10
Riverview Middle School
Public 6-8 • Assigned • 1.8mi
3/10
Mt. Diablo High School
Public 9-12 • Assigned • 6.3mi
3/10
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
7% chance of being in a wildfire in next 30 years
5/10 Heat Factor
7 days above 98° 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
14 unhealthy days expected this year, 14 days in 30 years
Provided by First Street
Historical weather
Bay Point, CA • 94565
Average low and high temperatures (°F)
60
41
64
46
72
52
72
52
79
56
85
60
87
61
91
63
85
63
74
55
64
48
56
45
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Sun exposure
In this area, properties receive around 12.1 hours in
June and 4.8 hours in December, placing it above the
U.S. average for solar exposure.
12.1 hrs
4.8 hrs
JuneDecember
Provided by Shadowmap
Estimated sale price
$302,000 – $366,000
Reach more buyers when you sell with Redfin. Save up to $3,177 in fees.3 minutes to get started.