21791 Bonness Rd is a 720 square foot house on a 10.2 acre lot with 2 bedrooms and 1 bathroom. - it last sold on August 28, 1985 for $90,000. Based on Redfin's Sonoma data, we estimate the home's value is $838,717.
Single-familyProperty Type
1974Year Built
10.2 acresLot Size
$1,165Est. Price/Sq.Ft.
Source:Public Records
Redfin Estimate
$838,717
$749K since sold in August 1985$15K since August
Recently sold homes
Estimate history
Homes for sale
This home's estimate is 18.4% higher than the average sale price ($708K) 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
DA B6 10
SR
VOH
Diverse Agriculture B6 Combining District 10 Acres
DA: Enhances and protects land where soil, climate, and water conditions support farming but where small acreage intensive farming and part-time farming activities are predominant, and where farming may not be the principal occupation of the farmer; Implement the diverse agriculture land use category of the general plan and the policies of the Agricultural Resource Element.; B6: To specify residential density and/or minimum parcel or lot size for a particular parcel, lot or area.
Zone overlays
Scenic Resources Combining District
Valley Oak Habitat Combining District
Permitted uses
Include but are not limited to:
Agriculture
Equestrian facility
Greenhouse / nursery
Day care facility
Housing-Group
Housing-Single unit
Theater / performing arts facility
Agriculture-Cropland
Park & open space
Timberland
Property details
Interior
Bathroom Information
# of Full Baths: 1
Room Information
# of Rooms: 4
Exterior
Property Information
Living Sq. Ft: 720
Building Sq. Ft: 2,986
# of Stories: 1
Legal Description: 86 FM PT OF 142-061-02 PM 8351
Lot Information
# of Buildings: 1
Land Sq. Ft: 444,312
Acres: 10.2
Zoning Code: DA10
County Use Description: RURAL RESID-2+ RESID
Financial
Assessor Information
Assessment Year: 2026
Public facts
Beds: 2
Baths: 1.0
Sq. Ft.: 720
Stories: 1.0
Lot Size: 10.2 acres
Style: Single Family Residential
Year Built: 1974
Year Renovated: 1986
County: Sonoma County
APN: 142061019000
Home facts updated by county records on Aug 13, 2026
Around this home
Schools
Prestwood Elementary School
Public K-5 • Assigned • 2.9mi
5/10
Adele Harrison Middle School
Public 6-8 • Assigned • 2.5mi
4/10
Sonoma Valley High School
Public 9-12 • Assigned • 2.6mi
7/10
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
5/10 Fire Factor
3% chance of being in a wildfire in next 30 years
4/10 Heat Factor
7 days above 94° expected this year, 16 days in 30 years
1/10 Wind Factor
Minimal risk of severe winds over next 30 years
9/10 Air Factor
19 unhealthy days expected this year, 19 days in 30 years
Provided by First Street
Historical weather
Sonoma, CA • 95476
Average low and high temperatures (°F)
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65
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Sun exposure
In this area, properties receive around 11.3 hours in
June and 4.9 hours in December, placing it above the
U.S. average for solar exposure.
11.3 hrs
4.9 hrs
JuneDecember
Provided by Shadowmap
Estimated sale price
$797,000 – $965,000
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