18405 Old Monte Rio Rd is a 849 square foot house on a 8,100 square foot lot with 2 bedrooms and 1 bathroom. Based on Redfin's Guerneville data, we estimate the home's value is $462,947.
Single-familyProperty Type
1924Year Built
8,100 sq ftLot Size
$545Est. Price/Sq.Ft.
Source:Public Records
Redfin Estimate
$462,947
$27K since July
Recently sold homes
Estimate history
Homes for sale
This home's estimate is 3.3% lower than the average sale price ($479K) 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 history record
Perform an electrical service upgrade.
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
Basement Information
Basement Sq. Ft: 303
Bathroom Information
# of Full Baths: 1
Heating & Cooling
Heating Type: Solar
Room Information
# of Rooms: 3
Exterior
Exterior Information
Physical Condition: Fair
Building Style Type: L-Shape
Construction Type: Wood/Steel
Building Construction Quality: Poor
Exterior Wall: Wood Siding
Property Information
Living Sq. Ft: 849
Ground Floor Sq. Ft: 849
Building Sq. Ft: 849
# of Stories: 1
Lot Information
# of Buildings: 1
Land Sq. Ft: 8,100
Acres: 0.186
Zoning Code: RR1
County Use Description: SINGLE FAM DWELLING
Utility Information
Sewer Type: Public
Water Service Type: Public
Financial
Assessor Information
Assessment Year: 2026
Public facts
Beds: 2
Baths: 1.0
Sq. Ft.: 849
Stories: 1.0
Lot Size: 8,100 square feet
Style: Single Family Residential
Year Built: 1924
Year Renovated: 1935
County: Sonoma County
APN: 072270018000
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, 20 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
$440,000 – $533,000
Reach more buyers when you sell with Redfin. Save up to $4,629 in fees.3 minutes to get started.