1661 Las Trampas Rd is a 3,660 square foot house on a 0.7 acre lot with 4 bedrooms and 4 bathrooms. - it last sold on June 11, 1992 for $550,000. Based on Redfin's Alamo data, we estimate the home's value is $3,021,940.
Single-familyProperty Type
1952Year Built
0.7 acresLot Size
$826Est. Price/Sq.Ft.
Source:Public Records
Redfin Estimate
$3,021,940
$2.5M since sold in June 1992$91K since October
Recently sold homes
Estimate history
Homes for sale
This home's estimate is 9.8% higher than the average sale price ($2.75M) of 6 comparable homes.
*Taxable value of land and structures on it ("additions") is determined regularly by local assessors and does not affect market price.
Permits
Sep 8, 2025 • Final
Building - residential solar photovoltaic
Install a rooftop solar system with battery storage and backup capabilities on a residential building. The project includes Hanwha Q.tron modules, a Tesla Powerwall 3 with a backup gateway, and a Tesla backup switch in a DC-coupled configuration. Work involves installing racking, electrical components, and a combiner on the external southeast wall.
Battery
Electrical
Solar
Feb 1, 2024 • Final
Building/residential/ad/single family addition
Construct a building addition including a garage conversion and a new detached garage. Remodel the existing interior space and add a front covered porch with new impervious area.
Addition
Remodel
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
Room Information
# of Rooms: 11
Exterior
Pool Information
Has Pool
Property Information
Subdivision Name: RANCHO SAN RAMON
Living Sq. Ft: 3,660
Ground Floor Sq. Ft: 3,660
Building Sq. Ft: 3,660
# of Stories: 1
Legal Description: PORS RO SAN RAMON & SEC 13 T1S R2W .70 AC
Parking & Garage Information
Garage/Parking Sq. Ft: 962
Lot Information
# of Buildings: 1
Land Sq. Ft: 30,492
Acres: 0.7
Zoning Code: R-20
County Use Description: SINGLE FAMILY
Financial
Assessor Information
Assessment Year: 2026
Public facts
Beds: 4
Baths: 4.0
Sq. Ft.: 3,660
Stories: 1.0
Lot Size: 0.7 acres
Style: Single Family Residential
Year Built: 1952
Year Renovated: 2000
County: Contra Costa County
APN: 1982000091
Home facts updated by county records on Oct 30, 2026
Around this home
Schools
K - 12
Preschool & daycare
Rancho Romero Elementary School
Public K-5 • Assigned • 0.5mi
9/10
Stone Valley Middle School
Public 6-8 • Assigned • 1.4mi
10/10
San Ramon Valley High School
Public 9-12 • Assigned • 2.1mi
10/10
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
4/10 Fire Factor
0.93% chance of being in a wildfire in next 30 years
3/10 Heat Factor
9 days above 93° expected this year, 18 days in 30 years
1/10 Wind Factor
Minimal risk of severe winds over next 30 years
8/10 Air Factor
14 unhealthy days expected this year, 15 days in 30 years
Provided by First Street
Historical weather
Alamo, CA • 94507
Average low and high temperatures (°F)
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82
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86
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81
59
71
52
62
44
56
43
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Feb
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Sun exposure
In this area, properties receive around 11.5 hours in
June and 4.9 hours in December, placing it above the
U.S. average for solar exposure.
11.5 hrs
4.9 hrs
JuneDecember
Provided by Shadowmap
Estimated sale price
$2.87M – $3.48M
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