18145 Old Monte Rio Rd is a 880 square foot house on a 5,500 square foot lot with 2 bedrooms and 1 bathroom. - it last sold on February 21, 1985 for $62,000. Based on Redfin's Guerneville data, we estimate the home's value is $459,134.
Single-familyProperty Type
1912Year Built
5,500 sq ftLot Size
$522Est. Price/Sq.Ft.
Source:Public Records
Redfin Estimate
$459,134
$397K since sold in February 1985$90K since July
Recently sold homes
Estimate history
Homes for sale
This home's estimate is 4.4% higher than the average sale price ($440K) 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
Sep 24, 2018 • Final
Building permit no plan check
Replace the main electrical panel in a single-family home with a new panel.
Electrical
Jun 11, 2016 • Final
Building permit no plan check
Install a new central heating system.
HVAC
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: 4
Exterior
Exterior Information
Building Style Type: L-Shape
Construction Type: Wood/Steel
Building Construction Quality: Average
Property Information
Subdivision Name: MONTESANO PARK
Living Sq. Ft: 880
Ground Floor Sq. Ft: 880
Building Sq. Ft: 880
# of Stories: 1
Legal Description: RUSSIAN RIVER HTS BLK 26 LOT 3
Lot Information
# of Buildings: 1
Land Sq. Ft: 5,500
Legal Lot Number: 3
Legal Block Number: 26
Acres: 0.1263
Zoning Code: RR1
County Use Description: SINGLE FAM DWELLING
Financial
Assessor Information
Assessment Year: 2026
Public facts
Beds: 2
Baths: 1.0
Sq. Ft.: 880
Stories: 1.0
Lot Size: 5,500 square feet
Style: Single Family Residential
Year Built: 1912
Year Renovated: 1990
County: Sonoma County
APN: 072240023000
Home facts updated by county records on Aug 13, 2026
Around this home
Schools
Guerneville Elementary School
Charter K-8 • Assigned • 2.1mi
4/10
Analy High School
Public 9-12 • Assigned • 11.4mi
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 87° 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
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43
69
45
66
45
74
49
78
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76
51
85
53
80
53
76
49
62
45
57
44
Jan
Feb
Mar
Apr
May
Jun
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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
$437,000 – $529,000
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