3909 Harmon Rd is a 1,022 square foot house on a 57 acre lot with 3 bedrooms and 1 bathroom. Based on Redfin's El Sobrante data, we estimate the home's value is $697,115.
Single-familyProperty Type
1951Year Built
57 acresLot Size
$682Est. Price/Sq.Ft.
Source:Public Records
Redfin Estimate
$697,115
$0 since August
Recently sold homes
Estimate history
Homes for sale
This home's estimate is 13.1% higher than the average sale price ($616K) of 6 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
$3,441 (+2.3%)
$83,930 + $101,498
$185,428
2024
$3,362 (+2.6%)
$82,285 + $99,508
$181,793
2023
$3,278 (+1.9%)
$80,672 + $97,557
$178,229
2022
$3,216 (+1.2%)
$79,091 + $95,645
$174,736
2021
$3,179 (+4.2%)
$77,541 + $93,770
$171,311
2020
$3,050 (+1.2%)
$76,021 + $91,932
$167,953
2019
$3,014 (+4.6%)
$75,242 + $90,990
$166,232
2018
$2,881 (+3.3%)
$73,767 + $89,206
$162,973
2017
$2,788 (+2.6%)
$70,903 + $85,743
$156,646
2016
$2,718 (+1.4%)
$70,903 + $85,743
$156,646
2015
$2,680 (+0.8%)
$69,513 + $84,062
$153,575
2014
$2,660 (+2.1%)
$67,128 + $81,179
$148,307
2013
$2,606 (+8.4%)
$67,128 + $81,179
$148,307
2012
$2,404 (+2.5%)
$66,825 + $80,813
$147,638
2011
$2,345 (+4.4%)
$64,952 + $78,548
$143,500
2010
$2,247 (+1.2%)
$64,231 + $77,676
$141,907
2009
$2,221 (+9.9%)
$63,751 + $77,096
$140,847
2008
$2,021
$63,903 + $77,280
$141,183
Tax history for 3909 Harmon Rd
Year
Property tax
Land + Additions
Assessment*
2025
$3,441 (+2.3%)
$83,930 + $101,498
$185,428
2024
$3,362 (+2.6%)
$82,285 + $99,508
$181,793
2023
$3,278 (+1.9%)
$80,672 + $97,557
$178,229
2022
$3,216 (+1.2%)
$79,091 + $95,645
$174,736
2021
$3,179 (+4.2%)
$77,541 + $93,770
$171,311
2020
$3,050 (+1.2%)
$76,021 + $91,932
$167,953
2019
$3,014 (+4.6%)
$75,242 + $90,990
$166,232
2018
$2,881 (+3.3%)
$73,767 + $89,206
$162,973
2017
$2,788 (+2.6%)
$70,903 + $85,743
$156,646
2016
$2,718 (+1.4%)
$70,903 + $85,743
$156,646
2015
$2,680 (+0.8%)
$69,513 + $84,062
$153,575
2014
$2,660 (+2.1%)
$67,128 + $81,179
$148,307
2013
$2,606 (+8.4%)
$67,128 + $81,179
$148,307
2012
$2,404 (+2.5%)
$66,825 + $80,813
$147,638
2011
$2,345 (+4.4%)
$64,952 + $78,548
$143,500
2010
$2,247 (+1.2%)
$64,231 + $77,676
$141,907
2009
$2,221 (+9.9%)
$63,751 + $77,096
$140,847
2008
$2,021
$63,903 + $77,280
$141,183
*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
Remodel
Jan 30, 2010 • Final
Building/commercial/t/tenant improvement
Work on a garage.
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: 6
Exterior
Property Information
Subdivision Name: GREEN ACRES
Living Sq. Ft: 1,022
Ground Floor Sq. Ft: 1,022
Building Sq. Ft: 1,022
# of Stories: 1
Legal Description: GREEN ACRES 57
Lot Information
# of Buildings: 1
Land Sq. Ft: 2,482,920
Legal Lot Number: 57
Acres: 57
Zoning Code: R-6
County Use Description: SINGLE FAMILY
Financial
Assessor Information
Assessment Year: 2026
Public facts
Beds: 3
Baths: 1.0
Sq. Ft.: 1,022
Stories: 1.0
Lot Size: 57 acres
Style: Single Family Residential
Year Built: 1951
Year Renovated: —
County: Contra Costa County
APN: 4350330108
Home facts updated by county records on Jul 13, 2026
Around this home
Schools
Sheldon Elementary School
Public K-6 • Assigned • 0.3mi
6/10
Betty Reid Soskin Middle
Public 6-8 • Assigned • 1.4mi
2/10
De Anza Senior High School
Public 9-12 • Assigned • 0.9mi
4/10
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
3/10 Fire Factor
0.46% chance of being in a wildfire in next 30 years
3/10 Heat Factor
7 days above 88° expected this year, 16 days in 30 years
1/10 Wind Factor
Minimal risk of severe winds over next 30 years
8/10 Air Factor
15 unhealthy days expected this year, 15 days in 30 years
Provided by First Street
Historical weather
El Sobrante, CA • 94803
Average low and high temperatures (°F)
59
44
61
45
67
49
65
49
69
51
68
52
66
53
73
55
73
56
73
54
61
48
57
45
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Sun exposure
In this area, properties receive around 11.1 hours in
June and 5 hours in December, placing it above the
U.S. average for solar exposure.
11.1 hrs
5 hrs
JuneDecember
Provided by Shadowmap
Estimated sale price
$663,000 – $802,000
Reach more buyers when you sell with Redfin. Save up to $6,971 in fees.3 minutes to get started.