21555 Duncan Rd is a 888 square foot house on a 1.06 acre lot with 2 bedrooms and 1 bathroom. - it last sold on October 02, 1996 for $175,000. Based on Redfin's Monte Rio data, we estimate the home's value is $689,637.
Single-familyProperty Type
1940Year Built
1.06 acresLot Size
$777Est. Price/Sq.Ft.
Source:Public Records
Redfin Estimate
$689,637
$515K since sold in October 1996$19K since August
Recently sold homes
Estimate history
Homes for sale
This home's estimate is 52.4% higher than the average sale price ($453K) 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.
Zoning
RRD B6 160
SR
Resources and Rural Development - B6 Combining District - One Dwelling per 160 Acres
Protects lands needed for: Commercial timber production, geothermal production, aggregate resources production; Watershed, fish and wildlife habitat, biotic resources; and Agricultural production activities not subject to the agricultural resources element of the general plan. Allows very low-density residential development and recreational and visitor-serving uses where compatible with resource use and available public services; and Implements the resources and rural development land use category of the general plan.; B Combining District: to specify residential density and/or minimum parcel or lot size for a particular parcel, lot or area.
Zone overlays
Scenic Resources Combining District
Permitted uses
Include but are not limited to:
Agriculture
Greenhouse / nursery
Livestock production
Housing-Group
Housing-Single unit
Property details
Interior
Bathroom Information
# of Full Baths: 1
Fireplace Information
# of Fireplaces: 1
Has Fireplace
Room Information
# of Rooms: 3
Exterior
Exterior Information
Building Style Type: Square Design
Construction Type: Wood/Steel
Building Construction Quality: Poor
Property Information
Living Sq. Ft: 888
Ground Floor Sq. Ft: 888
Building Sq. Ft: 888
# of Stories: 1
Legal Description: 1973 FORM PT OF 94-040-01
Lot Information
# of Buildings: 1
Land Sq. Ft: 46,174
Legal Lot Number: 2
Acres: 1.06
Zoning Code: RRD160
County Use Description: SINGLE FAM DWELLING
Financial
Assessor Information
Assessment Year: 2026
Public facts
Beds: 2
Baths: 1.0
Sq. Ft.: 888
Stories: 1.0
Lot Size: 1.06 acres
Style: Single Family Residential
Year Built: 1940
Year Renovated: 1940
County: Sonoma County
APN: 094040004000
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 • 11.5mi
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
3/10 Fire Factor
0.15% chance of being in a wildfire in next 30 years
2/10 Heat Factor
7 days above 84° 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
Monte Rio, CA • 95462
Average low and high temperatures (°F)
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73
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82
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78
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75
49
62
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44
Jan
Feb
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May
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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
$656,000 – $794,000
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