18420 Old Monte Rio Rd is a 1,804 square foot multi-family home on a 8,750 square foot lot with 3 bedrooms and 2 bathrooms. Based on Redfin's Guerneville data, we estimate the home's value is $426,828.
Multi-familyProperty Type
1942Year Built
8,750 sq ftLot Size
$237Est. Price/Sq.Ft.
Source:Public Records
Redfin Estimate
$426,828
$157K since July
Recently sold homes
Estimate history
Homes for sale
This home's estimate is 49.4% lower than the average sale price ($843K) 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
Legalize a bathroom remodel.
Bathroom
Remodel
Jun 11, 2016 • Final
Building permit with plan check
Bathroom
Electrical
Plumbing
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
Basement Information
Basement Sq. Ft: 780
Bathroom Information
# of Full Baths: 2
Fireplace Information
# of Fireplaces: 1
Has Fireplace
Room Information
# of Rooms: 8
Exterior
Exterior Information
Building Style Type: L-Shape
Construction Type: Wood/Steel
Building Construction Quality: Fair
Property Information
Subdivision Name: RUSSIAN RIVER HEIGHTS
Living Sq. Ft: 1,804
Ground Floor Sq. Ft: 1,024
Building Sq. Ft: 1,804
# of Stories: 2
Legal Description: RUSSIAN RIVER HTS BLK 42 LOT 38
Lot Information
# of Buildings: 1
Land Sq. Ft: 8,750
Legal Lot Number: 38
Legal Block Number: 42
Acres: 0.2009
Zoning Code: RR1
County Use Description: DUPLEX
Financial
Assessor Information
Assessment Year: 2026
Public facts
Beds: 3
Baths: 2.0
Sq. Ft.: 1,804
Stories: 2.0
Lot Size: 8,750 square feet
Style: Multi-Family (2-4 Unit)
Year Built: 1942
Year Renovated: —
County: Sonoma County
APN: 072270006000
Home facts updated by county records on Aug 13, 2026
Around this home
Schools
Guerneville Elementary School
Charter K-8 • Assigned • 2.2mi
4/10
Analy High School
Public 9-12 • Assigned • 11.2mi
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
3/10 Fire Factor
0.15% chance of being in a wildfire in next 30 years
2/10 Heat Factor
7 days above 86° expected this year, 19 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
Guerneville, CA • 95446
Average low and high temperatures (°F)
59
40
60
43
69
45
66
45
74
49
78
51
76
51
85
53
80
53
76
49
62
45
57
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
$406,000 – $491,000
Reach more buyers when you sell with Redfin. Save up to $4,268 in fees.3 minutes to get started.