4100 Cowell Rd is a 1,726 square foot house on a 0.25 acre lot with 3 bedrooms and 2 bathrooms. Based on Redfin's Concord data, we estimate the home's value is $809,747.
Single-familyProperty Type
1954Year Built
0.25 acresLot Size
$469Est. Price/Sq.Ft.
Source:Public Records
Redfin Estimate
$809,747
$3,000 since July
Recently sold homes
Estimate history
Homes for sale
This home's estimate is 8.8% lower than the average sale price ($887K) 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
$2,499 (+3.4%)
$29,193 + $108,286
$137,479
2024
$2,418 (+2.9%)
$28,621 + $106,163
$134,784
2023
$2,351 (+2.4%)
$28,060 + $104,082
$132,142
2022
$2,295 (+3.4%)
$27,510 + $102,042
$129,552
2021
$2,221 (+1.4%)
$26,971 + $100,042
$127,013
2020
$2,190 (+1.2%)
$26,443 + $98,081
$124,524
2019
$2,163 (+4.5%)
$26,172 + $97,076
$123,248
2018
$2,070 (+4.2%)
$25,659 + $95,173
$120,832
2017
$1,986 (+4.4%)
$24,663 + $91,478
$116,141
2016
$1,902 (+3.0%)
$24,663 + $91,478
$116,141
2015
$1,847 (+3.5%)
$24,180 + $89,685
$113,865
2014
$1,785 (+8.8%)
$23,351 + $86,608
$109,959
2013
$1,641 (+3.8%)
$23,351 + $86,608
$109,959
2012
$1,581 (+2.7%)
$23,246 + $86,217
$109,463
2011
$1,540 (+1.9%)
$22,791 + $84,527
$107,318
2010
$1,511 (+0.2%)
$22,345 + $82,870
$105,215
2009
$1,508 (+2.8%)
$22,178 + $82,251
$104,429
2008
$1,466
$22,231 + $82,447
$104,678
Tax history for 4100 Cowell Rd
Year
Property tax
Land + Additions
Assessment*
2025
$2,499 (+3.4%)
$29,193 + $108,286
$137,479
2024
$2,418 (+2.9%)
$28,621 + $106,163
$134,784
2023
$2,351 (+2.4%)
$28,060 + $104,082
$132,142
2022
$2,295 (+3.4%)
$27,510 + $102,042
$129,552
2021
$2,221 (+1.4%)
$26,971 + $100,042
$127,013
2020
$2,190 (+1.2%)
$26,443 + $98,081
$124,524
2019
$2,163 (+4.5%)
$26,172 + $97,076
$123,248
2018
$2,070 (+4.2%)
$25,659 + $95,173
$120,832
2017
$1,986 (+4.4%)
$24,663 + $91,478
$116,141
2016
$1,902 (+3.0%)
$24,663 + $91,478
$116,141
2015
$1,847 (+3.5%)
$24,180 + $89,685
$113,865
2014
$1,785 (+8.8%)
$23,351 + $86,608
$109,959
2013
$1,641 (+3.8%)
$23,351 + $86,608
$109,959
2012
$1,581 (+2.7%)
$23,246 + $86,217
$109,463
2011
$1,540 (+1.9%)
$22,791 + $84,527
$107,318
2010
$1,511 (+0.2%)
$22,345 + $82,870
$105,215
2009
$1,508 (+2.8%)
$22,178 + $82,251
$104,429
2008
$1,466
$22,231 + $82,447
$104,678
*Taxable value of land and structures on it ("additions") is determined regularly by local assessors and does not affect market price.
Zoning and permits
Zoning
Permits
RS10
Residential Single-Family District
The RS district is applied to areas of the city appropriate for single-family residential uses in neighborhoods at densities of 2.5 to 10 units per net acre, subject to appropriate standards. The RS zoning districts generally apply to the single-family residential districts with development existing at the time of the adoption of this development code. The specific allowable density for each parcel is shown on the zoning map by a numerical suffix residential density designator RS-10 corresponding to the minimum lot size 10000. The RS district is consistent with and implements the low density residential (LDR) land use designation of the general plan.
Permitted uses
Include but are not limited to:
Housing-Single unit
Housing-Senior
Recreation
Agriculture-Cropland
Agriculture-Grove / orchard / vineyard
Park & open space
Aug 7, 2023 • Final
Solar pv
Install a solar photovoltaic system. No energy storage system or main service panel upgrade is included.
Electrical
Solar
Jul 26, 2023 • Final
Reroof
Perform a residential reroof with a complete tear off and install new composition shingles.
Roofing
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: MONTE DEL DIABLO RHO
Living Sq. Ft: 1,726
Ground Floor Sq. Ft: 1,726
Building Sq. Ft: 1,726
# of Stories: 1
Legal Description: POR RO MONTE DEL DIABLO
Parking & Garage Information
Garage/Parking Sq. Ft: 440
Lot Information
# of Buildings: 1
Land Sq. Ft: 10,890
Acres: 0.25
County Use Description: SINGLE FAMILY
Financial
Assessor Information
Assessment Year: 2026
Public facts
Beds: 3
Baths: 2.0
Sq. Ft.: 1,726
Stories: 1.0
Lot Size: 0.25 acres
Style: Single Family Residential
Year Built: 1954
Year Renovated: 1954
County: Contra Costa County
APN: 1301800049
Home facts updated by county records on Jul 13, 2026
Around this home
Schools
El Monte Elementary School
Public K-5 • Assigned • 0.9mi
6/10
El Dorado Middle School
Public 6-8 • Assigned • 1.5mi
3/10
Concord High School
Public 9-12 • Assigned • 1.7mi
5/10
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 96° expected this year, 14 days in 30 years
1/10 Wind Factor
Minimal risk of severe winds over next 30 years
9/10 Air Factor
18 unhealthy days expected this year, 19 days in 30 years
Provided by First Street
Historical weather
Concord, CA • 94518
Average low and high temperatures (°F)
61
41
64
44
72
49
71
50
79
55
83
57
83
58
90
60
86
60
79
55
65
47
57
45
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Sun exposure
In this area, properties receive around 11.5 hours in
June and 4.9 hours in December, placing it above the
U.S. average for solar exposure.
11.5 hrs
4.9 hrs
JuneDecember
Provided by Shadowmap
Estimated sale price
$770,000 – $932,000
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