21530 Monte Rio Ave is a 480 square foot house on a 1,575 square foot lot with 1 bedroom and 1 bathroom. - it last sold on December 10, 1996 for $40,000. Based on Redfin's Monte Rio data, we estimate the home's value is $322,806.
Single-familyProperty Type
1924Year Built
1,575 sq ftLot Size
$673Est. Price/Sq.Ft.
Source:Public Records
Redfin Estimate
$322,806
$283K since sold in December 1996$15K since August
Recently sold homes
Estimate history
Homes for sale
This home's estimate is 6.6% lower than the average sale price ($346K) 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
Jun 11, 2016 • Final
Building permit no plan check
Replace an electrical meter on a single-family home.
Electrical
Electric meter
Jun 11, 2016 • Final
Building permit no plan check
Remove existing roofing and sheathing. Install new roof sheathing and composition shingles.
Roofing
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: 3
Exterior
Exterior Information
Building Style Type: Square Design
Construction Type: Wood/Steel
Building Construction Quality: Fair
Property Information
Subdivision Name: MONTE RIO PARK ADD 01
Living Sq. Ft: 480
Ground Floor Sq. Ft: 480
Building Sq. Ft: 480
# of Stories: 1
Lot Information
# of Buildings: 1
Land Sq. Ft: 1,575
Legal Lot Number: 25
Acres: 0.0362
Zoning Code: RR1
County Use Description: SINGLE FAM DWELLING
Financial
Assessor Information
Assessment Year: 2026
Public facts
Beds: 1
Baths: 1.0
Sq. Ft.: 480
Stories: 1.0
Lot Size: 1,575 square feet
Style: Single Family Residential
Year Built: 1924
Year Renovated: 1975
County: Sonoma County
APN: 095152013000
Home facts updated by county records on Aug 13, 2026
Around this home
Schools
Monte Rio Elementary School
Public K-8 • Assigned • 0.4mi
7/10
Analy High School
Public 9-12 • Assigned • 10.9mi
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
9 days above 86° expected this year, 24 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
60
43
69
44
66
46
74
49
75
51
73
52
82
53
78
53
75
49
62
45
58
44
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
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
$307,000 – $372,000
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