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About this home
Welcome to 4247 Gem Avenue, a beautifully renovated single-story home in the heart of Castro Valley! Thoughtfully transformed with quality craftsmanship, modern finishes, and extensive upgrades completed with permits. The stunning kitchen features stainless steel appliances, custom cabinetry, a spacious island, and a pot filler. Beautifully designed bathrooms offer walk-in showers, rainfall showerheads, and modern fixtures. Major improvements include new electrical wiring with a 200-amp panel, updated plumbing and drainage, a new HVAC furnace and ductwork, and a new composition roof. Additional highlights include waterproof plank flooring, designer lighting, an EV-ready garage, and refreshed landscaping. Conveniently located near Castro Valley’s highly regarded schools, shopping, dining, and commuter routes. Move-in ready with the peace of mind of permitted improvements!
Single-familyProperty Type
1947Year Built
5,775 sq ftLot Size
$575Price/Sq.Ft.
1 car garageParking
Listed by Kristen Bleth•DRE #02058725• Evolve Real Estate
Listed by Sunday Nguyen•DRE #02206061• eXp Realty of California
Make a winning offer with the help of a local agent
Around this home
Schools
K - 12
Preschool & daycare
Marshall Elementary School
Public K-5 • Assigned • 0.2mi
9/10
Creekside Middle School
Public 6-8 • Assigned • 0.3mi
10/10
Castro Valley High School
Public 9-12 • Assigned • 0.8mi
9/10
Provided by GreatSchools
About Central East Castro
Valley
Central East Castro Valley, located between Lake Chabot Regional Park and the Castro Valley BART station, is a hillside and suburban Castro Valley neighborhood with winding residential streets and a small-town commercial strip. The neighborhood’s character concentrates around the Castro Valley Blvd and Redwood Rd corridor, where independent cafes, bakeries, and low-key storefronts set a steady daytime rhythm. Mid-century ranch homes and updated split-levels sit alongside pockets of newer townhomes, often framed by mature trees and sloped lots. Lake Chabot’s trails and shoreline pull the landscape eastward into oak-studded open space. Community touchstones include the Castro Valley Marketplace, the Chabot Cinema, and the Castro Valley Arts Foundation’s gallery and events.
Provided by Walk Score and Local Logic
Offer insights
4247 Gem Ave · $999,000
$1.13M and above
75% chance or better to win
Why $1.13M+ is a strong offer
DAYS ON MARKET
13 days
The average home goes pending in 15 days.
SALE-TO-LIST
109.5%
Most homes are selling 9% above list price.
About offer insights
Property details
Interior
Exterior
Finance
Kitchen
Bathroom
Bedroom
Living
Interior features
Dining area
Breakfast bar
Updated kitchen
Three fireplaces, including one in the living room
Bedrooms
Three bedrooms
Bathrooms
Three full bathrooms
Kitchen
Dishwasher
Gas range
Refrigerator
Stone countertops
Laundry & utility
Laundry room with hookups
Flooring
Hardwood flooring
Heating & cooling
Central heating
Exterior features
Deck
Garden
Front and back yards
Fenced yard
Level terrain
Home design
Single-family residence
Parking
Attached garage with one parking space
Construction
Built in 1947
Stucco construction
Shingle roof
Utilities
Public water
Public sewer
Electricity and solar
View estimated energy costs and solar savings for this home
bridgeMLS, Bay East AOR, or Contra Costa AOR #41151756
Oct 20, 2026
Listed
$999,000
$575/sq ft
bridgeMLS, Bay East AOR, or Contra Costa AOR #41103454
Jul 29, 2025
Sold
$755,000
$435/sq ft
Jul 11, 2025
Pending
—
Jul 4, 2025
Listed
*
There are no remarks available.
Public Records
Sep 24, 1982
Sold
$31,000
$18/sq ft
Year
Property tax
Land + Additions
Assessment*
2025
$2,969 (+2.8%)
$226,500 + $528,500
$755,000
2024
$2,889 (+2.4%)
$124,047 + $60,861
$184,908
2023
$2,822 (+2.6%)
$121,615 + $59,668
$181,283
2022
$2,750 (+2.9%)
$116,894 + $57,351
$174,245
2021
$2,673 (+2.5%)
$116,894 + $57,351
$174,245
2020
$2,609 (−1.3%)
$114,602 + $56,227
$170,829
2019
$2,644 (+3.0%)
$113,427 + $55,651
$169,078
2018
$2,567 (+2.8%)
$111,204 + $54,560
$165,764
2017
$2,496 (+5.2%)
$106,886 + $52,441
$159,327
2016
$2,373 (+7.0%)
$106,886 + $52,441
$159,327
2015
$2,218 (+2.4%)
$104,791 + $51,413
$156,204
2014
$2,167 (+1.7%)
$101,195 + $49,649
$150,844
2013
$2,130 (+2.5%)
$101,195 + $49,649
$150,844
2012
$2,078 (+1.5%)
$100,738 + $49,425
$150,163
2011
$2,047 (+0.9%)
$98,763 + $48,456
$147,219
2010
$2,029
$96,826 + $47,506
$144,332
2009
$2,027 (+5.1%)
$96,103 + $47,151
$143,254
2008
$1,929
$96,331 + $47,263
$143,594
Public record
Public record
Zoning
Permits
Beds
3
Baths
1
Stories
1
Lot width
—
Lot depth
—
Lot size
5,775 Sq. Ft.
Year renovated
1947
Finished Sq. Ft.
1,080
Unfinished Sq. Ft.
—
Total Sq. Ft.
1,080
Year built
1947
Style
Single Family Residential
County
Alameda County
APN
084C066905300
Parking Spaces
—
Basement
—
Accessible
—
HOA Dues
—
Garage
—
Features
—
Last updated by owner on Sep 17, 2026.
R1
Single-Family Residence Districts
Single-family residence districts, hereinafter designated as R-1 districts, are established to provide for and protect established neighborhoods of one-family dwellings, and to provide space in suitable locations for additional development of this kind, together with appropriate community facilities and allowance for restricted interim cultivation of the soil compatible with such low-density residential development.
Permitted uses
Include but are not limited to:
Housing-Single unit
Agriculture-Cropland
Agriculture-Grove / orchard
Dec 15, 2025 • Active
Building
Perform a whole house interior remodel of a single-family home and legalize a rear addition. The project includes remodeling the kitchen and bathrooms, replacing all windows and drywall, and converting a dining room into a laundry closet, storage closet, and bathroom. Additional work involves upgrading the electrical service, installing a tankless water heater, replacing the roof with asphalt shingles, constructing a new attached deck, and demolishing an existing shed.
Addition
ADU
Demolition
Electrical
Plumbing
Remodel
Roofing
Apr 4, 2007 • Final
Building
Install new composition shingles over one existing layer of roofing.
Roofing
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.
Local insights from Redfin agents
Castro Valley remains a highly competitive market. On average, homes are selling for 103.7% of their asking price, with nearly 60% of properties closing above list price.
Castro Valley's fall market offers great buyer leverage. While median prices hold steady around $1.2M, increased inventory gives you room to negotiate on homes needing updates. Turnkey properties still move fast in under 15 days, so act quickly with...
Minimal risk of a flood reaching the building in the next 30 years
3/10 Fire Factor
0.46% chance of being in a wildfire in next 30 years
4/10 Heat Factor
7 days above 88° expected this year, 15 days in 30 years
1/10 Wind Factor
Minimal risk of severe winds over next 30 years
7/10 Air Factor
12 unhealthy days expected this year, 12 days in 30 years
Provided by First Street
Historical weather
Castro Valley, CA • 94546
Average low and high temperatures (°F)
63
43
64
46
71
49
69
49
73
53
74
54
75
57
79
57
79
60
73
53
65
48
61
46
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Sun exposure
82/ 100
Very good sunlight
Sunscore
This home receives average direct sun exposure in Castro Valley. There appears to be minimal shading by surrounding buildings, terrain, and vegetation.
8.8 hrs
5.8 hrs
JuneDecember
Provided by Shadowmap
Redfin Estimate for 4247 Gem Ave
$1,116,424
$117K over list price of $999K
Nearby comparable homes
The Redfin Estimate uses 6 recent nearby sales, priced between $982K to $1.4M.