Features include a luxurious formal living/dining room with French doors, a large family room with gas fireplace, designer kitchen with granite countertops, & SS appliances. Master suite includes his and her vanities & walk-in closet. The guest house includes a full bath and kitchenette.
Single-familyProperty Type
2004Year Built
8,210 sq ftLot Size
$596Est. Price/Sq.Ft.
3 car garageParking
Listed by Mona Koussa•DRE #01260089• BHHS Drysdale Properties
Bought with Lisa Snow•DRE #01717575• Keller Williams Realty
bridgeMLS, Bay East AOR, or Contra Costa AOR #40490402
Nov 12, 2010
Sold
$865,000
$235/sq ft
Oct 12, 2010
Pending
—
Sep 30, 2010
Listed
$863,900
$234/sq ft
bridgeMLS, Bay East AOR, or Contra Costa AOR #40484076
Sep 30, 2010
Listing Removed
—
Sep 24, 2010
Relisted
—
Sep 21, 2010
Pending
—
Sep 12, 2010
Relisted
—
Sep 10, 2010
Pending
—
Aug 24, 2010
Listed
*
Year
Property tax
Land + Additions
Assessment*
2025
$18,595 (−1.7%)
$535,126 + $595,241
$1,130,367
2024
$18,919 (+1.0%)
$524,634 + $583,570
$1,108,204
2023
$18,725 (+2.5%)
$514,348 + $572,128
$1,086,476
2022
$18,267 (+1.7%)
$504,263 + $560,910
$1,065,173
2021
$17,956 (+2.3%)
$494,376 + $549,912
$1,044,288
2020
$17,547
$484,683 + $539,130
$1,023,813
2019
$17,553 (+2.3%)
$479,714 + $533,602
$1,013,316
2018
$17,162 (−0.5%)
$470,308 + $523,140
$993,448
2017
$17,242 (+1.2%)
$452,047 + $502,827
$954,874
2016
$17,042 (+2.0%)
$452,047 + $502,827
$954,874
2015
$16,714 (+0.7%)
$443,184 + $492,968
$936,152
2014
$16,600 (+0.3%)
$427,977 + $476,053
$904,030
2013
$16,545 (+3.6%)
$427,977 + $476,053
$904,030
2012
$15,977 (+1.0%)
$426,043 + $473,902
$899,945
2011
$15,819 (+2.3%)
$412,340 + $458,660
$871,000
2010
$15,470 (−1.1%)
$409,500 + $455,500
$865,000
2009
$15,636 (−8.7%)
$385,153 + $454,847
$840,000
2008
$17,128
$389,738 + $460,262
$850,000
Tax history for 166 Avalon Ct
Year
Property tax
Land + Additions
Assessment*
2025
$18,595 (−1.7%)
$535,126 + $595,241
$1,130,367
2024
$18,919 (+1.0%)
$524,634 + $583,570
$1,108,204
2023
$18,725 (+2.5%)
$514,348 + $572,128
$1,086,476
2022
$18,267 (+1.7%)
$504,263 + $560,910
$1,065,173
2021
$17,956 (+2.3%)
$494,376 + $549,912
$1,044,288
2020
$17,547
$484,683 + $539,130
$1,023,813
2019
$17,553 (+2.3%)
$479,714 + $533,602
$1,013,316
2018
$17,162 (−0.5%)
$470,308 + $523,140
$993,448
2017
$17,242 (+1.2%)
$452,047 + $502,827
$954,874
2016
$17,042 (+2.0%)
$452,047 + $502,827
$954,874
2015
$16,714 (+0.7%)
$443,184 + $492,968
$936,152
2014
$16,600 (+0.3%)
$427,977 + $476,053
$904,030
2013
$16,545 (+3.6%)
$427,977 + $476,053
$904,030
2012
$15,977 (+1.0%)
$426,043 + $473,902
$899,945
2011
$15,819 (+2.3%)
$412,340 + $458,660
$871,000
2010
$15,470 (−1.1%)
$409,500 + $455,500
$865,000
2009
$15,636 (−8.7%)
$385,153 + $454,847
$840,000
2008
$17,128
$389,738 + $460,262
$850,000
*Taxable value of land and structures on it ("additions") is determined regularly by local assessors and does not affect market price.
Public record
Public record
Zoning
Permits
Beds
5
Baths
4
Stories
2
Lot width
—
Lot depth
—
Lot size
8,210 Sq. Ft.
Year renovated
2005
Sq. Ft.
3,387
Year built
2004
Style
Single Family Residential
County
Contra Costa County
APN
2233300306
Parking Spaces
—
Basement
—
Accessible
—
HOA Dues
—
Garage
—
Features
—
Last updated by owner on Jul 13, 2026.
PD
DVSP
Planned Development Zone
The PD zone is applied to large parcels of land in order to reduce or eliminate the rigidity, delays, and conflicts that otherwise would result from application of zoning standards and procedures designed primarily for small parcels, and to: Ensure orderly and thorough planning and review procedures that will result in quality urban design; Encourage variety and avoid monotony in large developments by allowing greater freedom in selecting the means to provide access, light, open space, and amenity; Provide a mechanism whereby the City may authorize desirable developments consistent with the General Plan without inviting speculative rezoning applications, which, if granted, often could deprive other owners of development opportunities without resulting in construction of the proposed facilities; Encourage allocation and improvement of common open space in residential areas, and provide for open space maintenance at the expense of those who will directly benefit from it; and Encourage the assembly of properties that might otherwise be developed in unrelated increments to the detriment of surrounding neighborhoods. Building intensity may be up to the maximum required by the General Plan land use classification applicable to the site. The PD zone is consistent with and implements all land use classifications of the General Plan.
Zone overlays
Dougherty Valley Specific Plan
Nov 20, 2019 • Final
Photovoltaic - electrical
Electrical
Solar
Apr 24, 2015 • Final
Water heater/softener - plumbing
Plumbing
Water heater
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
Parking
Parking Information
Has Attached Garage
Garage Spaces: 3
Covered Spaces: 3
Parking Features: Attached, Garage, Int Access From Garage, Garage Door Opener
Interior
Bathroom Information
# of Bathrooms Total: 4
# of Bathrooms Full: 4
Other Bathrooms Included Features: Shower Over Tub, Solid Surface, Updated Baths
Primary Bathroom Included Features: Split Bath, Stall Shower, Tile, Tub with Jets, Updated Baths
Interior Features
Interior Features: Bonus/Plus Room, Breakfast Bar, Stone Counters, Kitchen Island, Updated Kitchen
Appliances: Dishwasher, Disposal, Gas Range, Plumbed For Ice Maker, Microwave, Oven, Refrigerator, Self Cleaning Oven, Gas Water Heater
Laundry Features: 220 Volt Outlet, Gas Dryer Hookup, Hookups Only, Laundry Room
Fireplace Features: Electric, Family Room, Gas, Stone
Exterior
Building Information
Construction Materials: Stucco
Building Area Total: 3,687
Foundation Details: Slab
Exterior Features
Exterior Features: Back Yard, Front Yard, Sprinklers Automatic
Fencing: Fenced
Property Information
Living Area: 3687
Living Area Units: Square Feet
Property Type: Residential
Property Sub Type: Single Family Residence
Year Built: 2004
Lot Information
Other Structures: Guest House
Lot Size Square Feet: 8210
Lot Size Area: 0.19
Lot Size Units: Acres
Lot Size Acres: 0.19
Lot Features: Level, Regular
Utilities
Utility Information
Water Source: Public
Sewer: Public Sewer
Heating & Cooling
Has Heating
Heating: Zoned
Cooling: Ceiling Fan(s), Zoned
Location
School Information
High School District: San Ramon Valley (925) 552-5500
Public facts
Beds: 5
Baths: 4.0
Sq. Ft.: 3,387
Stories: 2.0
Lot Size: 8,210 square feet
Style: Single Family Residential
Year Built: 2004
Year Renovated: 2005
County: Contra Costa County
APN: 2233300306
Home facts updated by county records on Jul 13, 2026
Around this home
Schools
Hidden Hills Elementary School
Public K-5 • Assigned • 0.4mi
9/10
Windemere Ranch Middle School
Public 6-8 • Assigned • 1.3mi
9/10
Dougherty Valley High School
Public 9-12 • Assigned • 1.0mi
10/10
Provided by GreatSchools
Lifestyle
Provided by Walk Score and Local Logic
Local insights from Redfin agents
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Property information provided by bridgeMLS, Bay East AOR, or Contra Costa AOR when last listed in 2010. This data may not match public records. Learn more.