1109 Southdown Rd is a 1,920 square foot house on a 0.57 acre lot with 3 bedrooms and 2.5 bathrooms. - it last sold on August 14, 1992 for $690,000. Based on Redfin's Hillsborough data, we estimate the home's value is $5,155,082.
Single-familyProperty Type
1948Year Built
0.57 acresLot Size
$2,685Est. Price/Sq.Ft.
Source:Public Records
Redfin Estimate
$5,155,082
$4.5M since sold in August 1992$442K since August
Recently sold homes
Estimate history
Homes for sale
This home's estimate is 4.4% higher than the average sale price ($4.94M) 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
Jul 16, 2026 • Active
Adu
Construct a detached two-story accessory dwelling unit featuring two bedrooms and two bathrooms.
ADU
Apr 24, 2026 • Final
Electrical service
Upgrade the main electrical service from 100 amps to a 320 amp overhead service.
Electrical
Electric meter
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
# of 1/2 Baths: 1
Heating & Cooling
Air Conditioning Type: Central
Heating Type: Central
Fireplace Information
# of Fireplaces: 1
Has Fireplace
Room Information
# of Rooms: 6
Exterior
Exterior Information
Building Style Type: Ranch
Construction Type: Wood/Steel
Building Construction Quality: Good
Exterior Wall: Wood
Roof Covering Type: Shake
Roof Shape Type: Shake
View Information
View: Good
Property Information
Subdivision Name: HILLSBOROUGH PARK 02
Living Sq. Ft: 1,920
Ground Floor Sq. Ft: 1,920
Building Sq. Ft: 2,310
# of Stories: 1
Legal Description: WLY OF LOT 12 BLK O HILLSBOROUGH PARK NO 2 RSM 15/39 TO 47 TOWN OF HILLSBOROUGH
Parking & Garage Information
# of Parking Spaces: 2
Parking Type: Attached Garage
Garage/Parking Sq. Ft: 390
Garage / Carport Type: Attached
Lot Information
# of Buildings: 1
Land Sq. Ft: 25,003
Legal Lot Number: 12
Legal Block Number: O
Acres: 0.574
Zoning Code: R10025
County Use Description: SINGLE FAMILY
Financial
Assessor Information
Assessment Year: 2026
Public facts
Beds: 3
Baths: 2.5
Sq. Ft.: 1,920
Stories: 1.0
Lot Size: 0.57 acres
Style: Single Family Residential
Year Built: 1948
Year Renovated: 1983
County: San Mateo County
APN: 030222160
Home facts updated by county records on Sep 2, 2026
Around this home
Schools
West Hillsborough School
Public K-5 • Assigned • 0.9mi
9/10
Crocker Middle School
Public 6-8 • Assigned • 1.3mi
8/10
San Mateo High School
Public 9-12 • Assigned • 2.3mi
9/10
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
4 days above 85° expected this year, 8 days in 30 years
1/10 Wind Factor
Minimal risk of severe winds over next 30 years
6/10 Air Factor
11 unhealthy days expected this year, 11 days in 30 years
Provided by First Street
Historical weather
Hillsborough, CA • 94010
Average low and high temperatures (°F)
60
47
62
48
67
50
65
51
68
52
70
54
69
56
72
58
73
59
72
57
63
52
59
50
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Sun exposure
In this area, properties receive around 10.5 hours in
June and 5 hours in December, placing it above the
U.S. average for solar exposure.
10.5 hrs
5 hrs
JuneDecember
Provided by Shadowmap
Estimated sale price
$4.90M – $5.93M
Reach more buyers when you sell with Redfin. Save up to $51,551 in fees.3 minutes to get started.