21903 Santa Clara Ave is a 560 square foot house on a 5,040 square foot lot with 1 bedroom and 1 bathroom. - it last sold on June 26, 1995 for $10,000. Based on Redfin's Monte Rio data, we estimate the home's value is $363,115.
Single-familyProperty Type
1930Year Built
5,040 sq ftLot Size
$648Est. Price/Sq.Ft.
Source:Public Records
Redfin Estimate
$363,115
$353K since sold in June 1995$5,000 since August
Recently sold homes
Estimate history
Homes for sale
This home's estimate is 10.7% lower than the average sale price ($407K) of 4 comparable homes.
*Taxable value of land and structures on it ("additions") is determined regularly by local assessors and does not affect market price.
Zoning and permits
Zoning
Permits
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
Jun 11, 2016 • Final
Building history record
Work on the electrical service.
Electrical
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: L-Shape
Construction Type: Wood/Steel
Building Construction Quality: Poor
Property Information
Subdivision Name: MONTE CRISTO 01
Living Sq. Ft: 560
Ground Floor Sq. Ft: 560
Building Sq. Ft: 560
# of Stories: 1
Legal Description: LOT 123
Lot Information
# of Buildings: 1
Land Sq. Ft: 5,040
Legal Lot Number: 123
Acres: 0.1157
Zoning Code: RRD160
County Use Description: SINGLE FAM DWELLING
Financial
Assessor Information
Assessment Year: 2026
Public facts
Beds: 1
Baths: 1.0
Sq. Ft.: 560
Stories: 1.0
Lot Size: 5,040 square feet
Style: Single Family Residential
Year Built: 1930
Year Renovated: 1930
County: Sonoma County
APN: 094023016000
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 • 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
7 days above 84° expected this year, 21 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
$345,000 – $418,000
Reach more buyers when you sell with Redfin. Save up to $3,631 in fees.3 minutes to get started.