21444 Main St is a 1,215 square foot house on a 4,770 square foot lot with 4 bedrooms and 2 bathrooms. - it last sold on June 28, 2017 for $410,000. Based on Redfin's Monte Rio data, we estimate the home's value is $592,065.
Single-familyProperty Type
1952Year Built
4,770 sq ftLot Size
$487Est. Price/Sq.Ft.
Source:Public Records
Redfin Estimate
$592,065
$182K since sold in June 2017$30K since August
Recently sold homes
Estimate history
Homes for sale
This home's estimate is 1.8% higher than the average sale price ($581K) of 5 comparable homes.
*Taxable value of land and structures on it ("additions") is determined regularly by local assessors and does not affect market price.
Permits
Feb 19, 2026 • Final
Building permit no plan check
HVAC
Jan 22, 2026 • Final
Building permit with plan check
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
Basement Information
Basement Sq. Ft: 441
Bathroom Information
# of Full Baths: 2
Room Information
# of Rooms: 4
Exterior
Exterior Information
Construction Type: Wood/Steel
Building Construction Quality: Average
Property Information
Subdivision Name: MONTE RIO PARK TIER A
Living Sq. Ft: 1,215
Building Sq. Ft: 1,215
# of Stories: 1
Legal Description: MAP 15 PG 4 LOT 1,2
Parking & Garage Information
Garage/Parking Sq. Ft: 399
Lot Information
# of Buildings: 1
Land Sq. Ft: 4,770
Legal Lot Number: 1,2
Acres: 0.1095
Zoning Code: RR1
County Use Description: SINGLE FAM DWELLING
Financial
Assessor Information
Assessment Year: 2026
Public facts
Beds: 4
Baths: 2.0
Sq. Ft.: 1,215
Stories: 1.0
Lot Size: 4,770 square feet
Style: Single Family Residential
Year Built: 1952
Year Renovated: 1980
County: Sonoma County
APN: 095148006000
Home facts updated by county records on Aug 13, 2026
Around this home
Schools
Monte Rio Elementary School
Public K-8 • Assigned • 0.6mi
7/10
Analy High School
Public 9-12 • Assigned • 10.7mi
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
1/10 Fire Factor
Unlikely to be in a wildfire in next 30 years
2/10 Heat Factor
10 days above 86° expected this year, 26 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
69
44
66
46
74
49
75
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73
52
82
53
78
53
75
49
62
45
58
44
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
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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
$563,000 – $681,000
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