20540 River Blvd is a 1,509 square foot house on a 0.4 acre lot with 1 bathroom. - it last sold on January 13, 1988 for $106,000. Based on Redfin's Monte Rio data, we estimate the home's value is $624,134.
Single-familyProperty Type
1906Year Built
0.4 acresLot Size
$414Est. Price/Sq.Ft.
Source:Public Records
Redfin Estimate
$624,134
$518K since sold in January 1988$2,000 since August
Recently sold homes
Estimate history
Homes for sale
This home's estimate is 11.8% lower than the average sale price ($708K) 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
Jun 11, 2016 • Final
Building permit no plan check
Repair or replace the front steps and slats.
Remodel
Jun 11, 2016 • Final
Building history record
Construct a new foundation for a residential building.
New construction
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
Basement Information
Basement Sq. Ft: 312
Bathroom Information
# of Full Baths: 1
Fireplace Information
# of Fireplaces: 1
Has Fireplace
Room Information
# of Rooms: 1
Exterior
Exterior Information
Building Style Type: Square Design
Construction Type: Wood/Steel
Building Construction Quality: Poor
Property Information
Subdivision Name: EAST MONTE RIO ADD #1
Living Sq. Ft: 1,509
Ground Floor Sq. Ft: 1,509
Building Sq. Ft: 1,509
# of Stories: 1
Lot Information
# of Buildings: 1
Land Sq. Ft: 17,640
Legal Lot Number: 27,28
Acres: 0.405
Zoning Code: RR1
County Use Description: SINGLE FAM DWELLING
Location Information
Parcel Location Influence: River
Financial
Assessor Information
Assessment Year: 2026
Public facts
Beds: —
Baths: 1.0
Sq. Ft.: 1,509
Stories: 1.0
Lot Size: 0.4 acres
Style: Single Family Residential
Year Built: 1906
Year Renovated: 1924
County: Sonoma County
APN: 095191007000
Home facts updated by county records on Aug 13, 2026
Around this home
Schools
Monte Rio Elementary School
Public K-8 • Assigned • 0.5mi
7/10
Analy High School
Public 9-12 • Assigned • 10.6mi
8/10
Provided by GreatSchools
Lifestyle
Provided by Walk Score and Local Logic
Climate risks
6/10 Flood Factor
Estimated 50-61% chance 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
2/10 Heat Factor
9 days above 86° expected this year, 25 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
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74
49
75
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73
52
82
53
78
53
75
49
62
45
58
44
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
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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
$593,000 – $718,000
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