3416 Keystone Loop is a 4,088 square foot house on a 7,300 square foot lot with 4 bedrooms and 3 bathrooms. Based on Redfin's Discovery Bay data, we estimate the home's value is $745,342.
Single-familyProperty Type
2003Year Built
7,300 sq ftLot Size
$182Est. Price/Sq.Ft.
3 car garageParking
Source:Public Records
Redfin Estimate
$745,342
$38K since August
Recently sold homes
Estimate history
Homes for sale
This home's estimate is 4.2% lower than the average sale price ($778K) of 6 comparable homes.
bridgeMLS, Bay East AOR, or Contra Costa AOR #41127580
Jun 9, 2026
Listing Removed
—
Year
Property tax
Land + Additions
Assessment*
2025
$10,331 (+4.9%)
$181,269 + $583,853
$765,122
2024
$9,852 (+1.6%)
$177,715 + $572,405
$750,120
2023
$9,700 (+1.7%)
$174,231 + $561,182
$735,413
2022
$9,540 (+2.4%)
$170,815 + $550,179
$720,994
2021
$9,314 (+7.9%)
$167,466 + $539,392
$706,858
2020
$8,632 (−0.4%)
$164,183 + $528,816
$692,999
2019
$8,664 (+8.2%)
$148,548 + $478,452
$627,000
2018
$8,008 (+3.3%)
$148,547 + $478,453
$627,000
2017
$7,753 (+13.5%)
$133,859 + $431,141
$565,000
2016
$6,831 (+8.0%)
$133,859 + $431,141
$565,000
2015
$6,326 (−5.6%)
$119,763 + $385,737
$505,500
2014
$6,700 (+27.6%)
$119,052 + $383,448
$502,500
2013
$5,251 (+8.6%)
$119,052 + $383,448
$502,500
2012
$4,833 (+0.3%)
$88,134 + $283,866
$372,000
2011
$4,820 (−5.0%)
$79,250 + $255,250
$334,500
2010
$5,073 (+0.7%)
$79,250 + $255,250
$334,500
2009
$5,040 (−20.7%)
$86,832 + $279,668
$366,500
2008
$6,352
$87,543 + $281,957
$369,500
Tax history for 3416 Keystone Loop
Year
Property tax
Land + Additions
Assessment*
2025
$10,331 (+4.9%)
$181,269 + $583,853
$765,122
2024
$9,852 (+1.6%)
$177,715 + $572,405
$750,120
2023
$9,700 (+1.7%)
$174,231 + $561,182
$735,413
2022
$9,540 (+2.4%)
$170,815 + $550,179
$720,994
2021
$9,314 (+7.9%)
$167,466 + $539,392
$706,858
2020
$8,632 (−0.4%)
$164,183 + $528,816
$692,999
2019
$8,664 (+8.2%)
$148,548 + $478,452
$627,000
2018
$8,008 (+3.3%)
$148,547 + $478,453
$627,000
2017
$7,753 (+13.5%)
$133,859 + $431,141
$565,000
2016
$6,831 (+8.0%)
$133,859 + $431,141
$565,000
2015
$6,326 (−5.6%)
$119,763 + $385,737
$505,500
2014
$6,700 (+27.6%)
$119,052 + $383,448
$502,500
2013
$5,251 (+8.6%)
$119,052 + $383,448
$502,500
2012
$4,833 (+0.3%)
$88,134 + $283,866
$372,000
2011
$4,820 (−5.0%)
$79,250 + $255,250
$334,500
2010
$5,073 (+0.7%)
$79,250 + $255,250
$334,500
2009
$5,040 (−20.7%)
$86,832 + $279,668
$366,500
2008
$6,352
$87,543 + $281,957
$369,500
*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
P-1
Planned Unit District
A large-scale integrated development or a general plan special area of concern provides an opportunity for, and requires cohesive design when flexible regulations are applied; whereas the application of conventional regulation, designed primarily for individual lot development, to a large-scale development or special area may create a monotonous and inappropriate neighborhood. The planned unit district is intended to allow diversification in the relationship of various uses, buildings, structures, lot sizes and open space while insuring substantial compliance with the general plan and the intent of the county code in requiring adequate standards necessary to satisfy the requirements of the public health, safety and general welfare. These standards shall be observed without unduly inhibiting the advantages of large-scale site or special area planning.
Permitted uses
Include but are not limited to:
Housing-Single unit
Feb 20, 2003 • Final
Building/residential/r/new single family-duplex
Construct a new single-family home based on a specific plan.
New construction
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
Property Information
Subdivision Name: SUBDIVISION 8430
Living Sq. Ft: 4,088
Ground Floor Sq. Ft: 1,991
Building Sq. Ft: 4,088
# of Stories: 2
Legal Description: T8430 L42
Parking & Garage Information
Garage/Parking Sq. Ft: 715
Lot Information
# of Buildings: 1
Land Sq. Ft: 7,300
Legal Lot Number: 42
Acres: 0.1676
Zoning Code: P-1
County Use Description: SINGLE FAMILY DETACHED WITH MA
Financial
Assessor Information
Assessment Year: 2026
Public facts
Beds: 4
Baths: 3.0
Sq. Ft.: 4,088
Stories: 2.0
Lot Size: 7,300 square feet
Style: Single Family Residential
Year Built: 2003
Year Renovated: 2003
County: Contra Costa County
APN: 0114210420
Home facts updated by county records on Jul 13, 2026
Around this home
Schools
Timber Point Elementary School
Public K-5 • Assigned • 0.5mi
6/10
Excelsior Middle School
Public 6-8 • Assigned • 2.8mi
4/10
Liberty High School
Public 9-12 • Assigned • 4.5mi
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
2/10 Fire Factor
0.00% chance of being in a wildfire in next 30 years
6/10 Heat Factor
7 days above 102° expected this year, 14 days in 30 years
1/10 Wind Factor
Minimal risk of severe winds over next 30 years
9/10 Air Factor
20 unhealthy days expected this year, 21 days in 30 years
Provided by First Street
Historical weather
Discovery Bay, CA • 94505
Average low and high temperatures (°F)
59
39
63
44
72
49
73
49
82
55
89
58
92
60
95
62
89
60
80
55
64
46
56
43
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Sun exposure
92/ 100
Exceptional sunlight
Sunscore
This home ranks in the top 26% for direct sun exposure in Discovery Bay. There appears to be minimal shading by surrounding buildings, terrain, and vegetation.
10.1 hrs
6.3 hrs
JuneDecember
Provided by Shadowmap
Estimated sale price
$709,000 – $858,000
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