20240 Alder Rd is a 948 square foot house on a 6,750 square foot lot with 2 bedrooms and 2 bathrooms. - it last sold on November 12, 2003 for $255,000. Based on Redfin's Monte Rio data, we estimate the home's value is $537,891.
Single-familyProperty Type
1980Year Built
6,750 sq ftLot Size
$567Est. Price/Sq.Ft.
Source:Public Records
Redfin Estimate
$537,891
$283K since sold in November 2003$15K since July
Recently sold homes
Estimate history
Homes for sale
This home's estimate is 14.7% lower than the average sale price ($631K) 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
May 12, 2026 • Final
Building permit no plan check
Electrical
Jun 11, 2016 • Final
Building history record
Work on the electrical service.
Electrical
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
Bathroom Information
# of Full Baths: 2
Room Information
# of Rooms: 4
Exterior
Exterior Information
Building Style Type: L-Shape
Construction Type: Wood/Steel
Building Construction Quality: Average
Property Information
Subdivision Name: EAST MONTE RIO ADD #1
Living Sq. Ft: 948
Ground Floor Sq. Ft: 948
Building Sq. Ft: 948
# of Stories: 1
Legal Description: MAP C1 124
Parking & Garage Information
Parking Type: Detached Garage
Garage/Parking Sq. Ft: 768
Garage / Carport Type: Detached
Lot Information
# of Buildings: 1
Land Sq. Ft: 6,750
Legal Lot Number: 5,6
Legal Block Number: 3
Acres: 0.155
Zoning Code: RR1
County Use Description: SINGLE FAM DWELLING
Financial
Assessor Information
Assessment Year: 2026
Public facts
Beds: 2
Baths: 2.0
Sq. Ft.: 948
Stories: 1.0
Lot Size: 6,750 square feet
Style: Single Family Residential
Year Built: 1980
Year Renovated: 1980
County: Sonoma County
APN: 095233024000
Home facts updated by county records on Aug 13, 2026
Around this home
Schools
Places
Transit
Monte Rio Elementary School
Public K-8 • Assigned • 0.6mi
7/10
Analy High School
Public 9-12 • Assigned • 10.5mi
8/10
Provided by GreatSchools
Lifestyle
Provided by Walk Score and Local Logic
Climate risks
6/10 Flood Factor
Estimated 22-32% chance of a flood reaching the building in the next 30 years
3/10 Fire Factor
0.15% chance of being in a wildfire in next 30 years
2/10 Heat Factor
10 days above 86° expected this year, 26 days in 30 years
1/10 Wind Factor
Minimal risk of severe winds over next 30 years
9/10 Air Factor
17 unhealthy days expected this year, 19 days in 30 years
Provided by First Street
Historical weather
Monte Rio, CA • 95462
Average low and high temperatures (°F)
59
40
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43
69
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66
46
74
49
75
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73
52
81
53
78
53
75
49
62
45
58
44
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Sun exposure
In this area, properties receive around 10.6 hours in
June and 4.9 hours in December, placing it above the
U.S. average for solar exposure.
10.6 hrs
4.9 hrs
JuneDecember
Provided by Shadowmap
Estimated sale price
$511,000 – $619,000
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