21840 Highway 116 is a 4,332 square foot house on a 0.66 acre lot with 7 bedrooms and 3.5 bathrooms. - it last sold on May 04, 1982 for $277,000. Based on Redfin's Monte Rio data, we estimate the home's value is $1,835,286.
Single-familyProperty Type
1930Year Built
0.66 acresLot Size
$424Est. Price/Sq.Ft.
Source:Public Records
Redfin Estimate
$1,835,286
$1.6M since sold in May 1982$155K since August
Recently sold homes
Estimate history
Homes for sale
This home's estimate is 101.6% higher than the average sale price ($910K) 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
Jul 17, 2023 • Final
Building permit no plan check
Replace the furnace and ducting in a single-family home.
HVAC
Jun 5, 2019 • Final
Building permit no plan check
Repair wall coverings on the first floor of a single-family home.
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: 2,166
Bathroom Information
# of Full Baths: 3
# of 1/2 Baths: 1
Fireplace Information
# of Fireplaces: 1
Has Fireplace
Room Information
# of Rooms: 10
Exterior
Exterior Information
Building Style Type: U-Shape
Construction Type: Wood/Steel
Building Construction Quality: Good
Property Information
Subdivision Name: MONTE CRISTO 02
Living Sq. Ft: 4,332
Building Sq. Ft: 4,332
# of Stories: 2
Parking & Garage Information
Garage/Parking Sq. Ft: 500
Lot Information
# of Buildings: 1
Land Sq. Ft: 28,630
Legal Lot Number: 1-4
Acres: 0.6573
Zoning Code: RR1
County Use Description: SINGLE FAM DWELLING
Location Information
Parcel Location Influence: River
Financial
Assessor Information
Assessment Year: 2026
Public facts
Beds: 7
Baths: 3.5
Sq. Ft.: 4,332
Stories: 2.0
Lot Size: 0.66 acres
Style: Single Family Residential
Year Built: 1930
Year Renovated: 1939
County: Sonoma County
APN: 094056002000
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 • 11.6mi
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
8 days above 84° expected this year, 22 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)
59
40
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43
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74
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73
52
82
53
78
53
75
49
62
45
58
44
Jan
Feb
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Apr
May
Jun
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Aug
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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
$1.74M – $2.11M
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