509 Summer Valley Ct is a 2,980 square foot house on a 9,900 square foot lot with 4 bedrooms and 3 bathrooms. - it last sold on July 27, 2010 for $750,000. Based on Redfin's San Ramon data, we estimate the home's value is $1,659,643.
Single-familyProperty Type
1995Year Built
9,900 sq ftLot Size
$557Est. Price/Sq.Ft.
3 car garageParking
Source:Public Records
Redfin Estimate
$1,659,643
$910K since sold in July 2010$14K since October
Recently sold homes
Estimate history
Homes for sale
This home's estimate is 22.1% lower than the average sale price ($2.13M) of 6 comparable homes.
bridgeMLS, Bay East AOR, or Contra Costa AOR #40453387
Aug 3, 2010
Listing Removed
—
Public Records
Jul 27, 2010
Sold
$750,000
$252/sq ft
Public Records
Aug 23, 1995
Sold
$393,000
$132/sq ft
Year
Property tax
Land + Additions
Assessment*
2026
$11,987 (+3.2%)
$574,984 + $405,104
$980,088
2025
$11,620 (+1.9%)
$574,984 + $405,104
$980,088
2024
$11,399 (+1.6%)
$563,710 + $397,161
$960,871
2023
$11,224 (+0.7%)
$552,657 + $389,374
$942,031
2022
$11,145 (+2.0%)
$541,821 + $381,740
$923,561
2021
$10,931 (+0.6%)
$531,198 + $374,255
$905,453
2020
$10,863 (+1.3%)
$520,783 + $366,917
$887,700
2019
$10,724 (+3.7%)
$515,444 + $363,155
$878,599
2018
$10,343 (+3.6%)
$505,338 + $356,035
$861,373
2017
$9,987 (+1.1%)
$485,716 + $342,210
$827,926
2016
$9,874 (+1.0%)
$485,716 + $342,210
$827,926
2015
$9,781 (+1.1%)
$476,193 + $335,500
$811,693
2014
$9,673 (+0.9%)
$459,854 + $323,988
$783,842
2013
$9,583 (+2.7%)
$459,854 + $323,988
$783,842
2012
$9,333 (+1.5%)
$457,776 + $322,524
$780,300
2011
$9,197 (+42.2%)
$448,800 + $316,200
$765,000
2010
$6,469 (+0.2%)
$440,000 + $310,000
$750,000
2009
$6,455 (+3.5%)
$198,190 + $307,586
$505,776
2008
$6,239
$198,661 + $308,317
$506,978
Tax history for 509 Summer Valley Ct
Year
Property tax
Land + Additions
Assessment*
2026
$11,987 (+3.2%)
$574,984 + $405,104
$980,088
2025
$11,620 (+1.9%)
$574,984 + $405,104
$980,088
2024
$11,399 (+1.6%)
$563,710 + $397,161
$960,871
2023
$11,224 (+0.7%)
$552,657 + $389,374
$942,031
2022
$11,145 (+2.0%)
$541,821 + $381,740
$923,561
2021
$10,931 (+0.6%)
$531,198 + $374,255
$905,453
2020
$10,863 (+1.3%)
$520,783 + $366,917
$887,700
2019
$10,724 (+3.7%)
$515,444 + $363,155
$878,599
2018
$10,343 (+3.6%)
$505,338 + $356,035
$861,373
2017
$9,987 (+1.1%)
$485,716 + $342,210
$827,926
2016
$9,874 (+1.0%)
$485,716 + $342,210
$827,926
2015
$9,781 (+1.1%)
$476,193 + $335,500
$811,693
2014
$9,673 (+0.9%)
$459,854 + $323,988
$783,842
2013
$9,583 (+2.7%)
$459,854 + $323,988
$783,842
2012
$9,333 (+1.5%)
$457,776 + $322,524
$780,300
2011
$9,197 (+42.2%)
$448,800 + $316,200
$765,000
2010
$6,469 (+0.2%)
$440,000 + $310,000
$750,000
2009
$6,455 (+3.5%)
$198,190 + $307,586
$505,776
2008
$6,239
$198,661 + $308,317
$506,978
*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
RS-6
Single-Family Residential Zone
The RS zone is applied to areas of the City appropriate for single-family residential land uses in neighborhoods at a density of three to six units per net acre, subject to appropriate standards. The specific allowable density for each parcel is shown on the Zoning Map by a numerical suffix residential density designator (see Section D2-8). Minimum lot size for new parcels ranges from 3,500 to 12,000 sq ft. Depending upon the applicable residential density designator, the RS zone is consistent with and implements the Single Family Low Density, Single Family Low-Medium Density, and Single Family Medium Density land use classifications of the General Plan.
Permitted uses
Include but are not limited to:
Day care facility
Housing-Single unit
Housing-Senior
Housing-Student
Housing-Other
Mar 9, 2026 • Active
Bathroom remodel - building residential
Bathroom
Remodel
Dec 15, 2023 • Final
Furnace a/c - mechanical (residential)
HVAC
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: 10
Exterior
Property Information
Subdivision Name: SUBDIVISION 7750
Living Sq. Ft: 2,980
Ground Floor Sq. Ft: 1,556
Building Sq. Ft: 2,980
# of Stories: 2
Legal Description: T7750 L21
Parking & Garage Information
Garage/Parking Sq. Ft: 692
Lot Information
# of Buildings: 1
Land Sq. Ft: 9,900
Legal Lot Number: 21
Acres: 0.2273
County Use Description: SINGLE FAMILY
Financial
Assessor Information
Assessment Year: 2026
Public facts
Beds: 4
Baths: 3.0
Sq. Ft.: 2,980
Stories: 2.0
Lot Size: 9,900 square feet
Style: Single Family Residential
Year Built: 1995
Year Renovated: 1996
County: Contra Costa County
APN: 2109200218
Home facts updated by county records on Oct 30, 2026
Around this home
Schools
K - 12
Preschool & daycare
Country Club Elementary School
Public K-5 • Assigned • 1.7mi
9/10
Pine Valley Middle School
Public 6-8 • Assigned • 1.5mi
10/10
California High School
Public 9-12 • Assigned • 1.7mi
10/10
Provided by GreatSchools
Lifestyle
Provided by Walk Score and Local Logic
Local insights from Redfin agents
San Ramon remains competitive, with homes averaging 1 offer and selling in 29 days. Median price is $1.4M (+2.8%), while price per sq. ft. is $677 (-1.2%). Buyers have negotiation opportunities; sellers should price strategically.
San Ramon, Past 3 months,Median price $1.51M, down 4.5% YoY,Homes sold: 169 in July, up 1%,Days on market 20 days,Market Active but more balanced; slight seller advantage,Bottom line: Prices have softened, but homes are still selling relatively...