121 Horn Ave is a 1,489 square foot house on a 0.42 acre lot with 2 bedrooms and 2 bathrooms. - it last sold on June 18, 1996 for $110,000. Based on Redfin's Santa Rosa data, we estimate the home's value is $663,058.
Single-familyProperty Type
1953Year Built
0.42 acresLot Size
$445Est. Price/Sq.Ft.
Source:Public Records
Redfin Estimate
$663,058
$553K since sold in June 1996$18K since October
Recently sold homes
Estimate history
Homes for sale
This home's estimate is 13.1% lower than the average sale price ($763K) 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
Aug 1, 2023 • Final
Building permit with plan check
Electrical
Generator
Apr 8, 2021 • Final
Building permit no plan check
Reroof a single-family home using an overlay method. Upgrade the electrical service and perform minor fascia repairs. Install new fans in the home.
Electrical
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: 2
Heating & Cooling
Heating Type: Wall Furnace
Room Information
# of Rooms: 5
Exterior
Exterior Information
Physical Condition: Average
Building Style Type: Square Design
Construction Type: Wood/Steel
Building Construction Quality: Average
Exterior Wall: Stucco
Property Information
Subdivision Name: RANCHO COTATI SUB #8
Living Sq. Ft: 1,489
Building Sq. Ft: 1,764
# of Stories: 1
Parking & Garage Information
Parking Type: Attached Garage
Garage/Parking Sq. Ft: 275
Garage / Carport Type: Attached
Lot Information
# of Buildings: 1
Land Sq. Ft: 18,480
Legal Lot Number: 24,25
Acres: 0.4242
Zoning Code: RR3
County Use Description: SINGLE FAM DWELLING
Utility Information
Sewer Type: Septic
Water Service Type: Commercial
Financial
Assessor Information
Assessment Year: 2026
Public facts
Beds: 2
Baths: 2.0
Sq. Ft.: 1,489
Stories: 1.0
Lot Size: 0.42 acres
Style: Single Family Residential
Year Built: 1953
Year Renovated: 1953
County: Sonoma County
APN: 045290031000
Home facts updated by county records on Oct 28, 2026
Around this home
Schools
K - 12
Preschool & daycare
Taylor Mountain Elementary School
Public K-6 • Assigned • 1.7mi
2/10
Montgomery High School
Public 9-12 • Assigned • 4.7mi
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
3/10 Fire Factor
0.62% chance of being in a wildfire in next 30 years
4/10 Heat Factor
7 days above 91° expected this year, 16 days in 30 years
1/10 Wind Factor
Minimal risk of severe winds over next 30 years
8/10 Air Factor
15 unhealthy days expected this year, 17 days in 30 years
Provided by First Street
Historical weather
Santa Rosa, CA • 95407
Average low and high temperatures (°F)
62
39
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43
70
45
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46
74
50
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78
53
83
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80
56
73
50
65
45
58
43
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
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Dec
Sun exposure
In this area, properties receive around 11.1 hours in
June and 4.9 hours in December, placing it above the
U.S. average for solar exposure.
11.1 hrs
4.9 hrs
JuneDecember
Provided by Shadowmap
Estimated sale price
$630,000 – $763,000
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