20677 Monte Rio Ave is a 528 square foot house on a 9,765 square foot lot with 1 bedroom and 1 bathroom. - it last sold on July 22, 1994 for $105,000. Based on Redfin's Monte Rio data, we estimate the home's value is $479,158.
Single-familyProperty Type
1910Year Built
9,765 sq ftLot Size
$907Est. Price/Sq.Ft.
Source:Public Records
Redfin Estimate
$479,158
$374K since sold in July 1994$55K since July
Recently sold homes
Estimate history
Homes for sale
This home's estimate is 1.3% higher than the average sale price ($473K) 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 with plan check
Construct a detached deck.
Addition
Jun 11, 2016 • Final
Building permit no plan check
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
Bathroom Information
# of Full Baths: 1
Room Information
# of Rooms: 3
Exterior
Exterior Information
Building Style Type: Square Design
Construction Type: Wood/Steel
Building Construction Quality: Poor
Property Information
Subdivision Name: MONTE RIO
Living Sq. Ft: 528
Building Sq. Ft: 528
# of Stories: 1
Legal Description: LOT 10,11
Lot Information
# of Buildings: 1
Land Sq. Ft: 9,765
Legal Lot Number: 10,11
Acres: 0.2242
Zoning Code: RR1
County Use Description: SINGLE FAM DWELLING
Financial
Assessor Information
Assessment Year: 2026
Public facts
Beds: 1
Baths: 1.0
Sq. Ft.: 528
Stories: 1.0
Lot Size: 9,765 square feet
Style: Single Family Residential
Year Built: 1910
Year Renovated: 1945
County: Sonoma County
APN: 095181007000
Home facts updated by county records on Aug 13, 2026
Around this home
Schools
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
1/10 Flood Factor
Minimal risk 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
8 days above 86° expected this year, 22 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
60
43
69
44
66
46
74
49
75
51
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
$456,000 – $552,000
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