Charming, beautifully remodeled 3-bedroom, 1-bath home offering 1,035 square feet of comfortable living space, plus a detached 250-square-foot cottage (ADU). The rental income from the cottage provides an excellent opportunity to offset your mortgage, making it easier to own more home in this desirable, quiet court location. Tasteful updates are found throughout the property. Gorgeous hardwood floors flow through most of the home, complemented by tile flooring in the kitchen, bathroom, and laundry room, with carpet in select areas. The updated kitchen features Corian countertops, attractive wood cabinetry, a 4-burner gas range, built-in microwave, and abundant cabinet space. A spacious laundry room offers even more storage with extensive built-in cabinetry. The inviting living room showcases a custom tray ceiling, elegant crown molding, and energy-efficient LED lighting, creating a warm and welcoming atmosphere. Step outside to a patio deck overlooking the private, fenced backyard with lush lawn—perfect for relaxing or entertaining. A matching storage shed provides additional space for tools, gardening equipment, or seasonal items. A standout feature of this property is the detached, updated studio ADU, offering exceptional flexibility and income potential. Currently rented for $1,750 per month plus utilities, the cottage is separately fenced for added privacy and is ideal as a rental, guest house, private home office, or space for extended family. Move-in ready and thoughtfully updated, this exceptional property combines comfort, style, and outstanding investment potential. Don't miss this rare opportunity!
For sale
$999,950
4231 Somerset Ave, Castro Valley, CA 94546
3beds
1,285sqft
Residential, Single Family Residence
Built in 1949
5,227 Square Feet Lot
$-- Zestimate®
$778/sqft
$-- HOA
What's special
Custom tray ceilingPatio deckCorian countertopsExtensive built-in cabinetryDetached updated studio aduGorgeous hardwood floorsUpdated kitchen
- 13 days |
- 1,347 |
- 51 |
Zillow last checked:
Listing updated:
Listed by:
Tim Fiebig DRE #00657474 tim@timfiebig.com,
Exp Realty Of California, Inc,
Renhui Yang DRE #02069549 510-213-0821,
Exp Realty Of California, Inc
Source: Bay East AOR,MLS#: 41139746
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Facts & features
Interior
Bedrooms & bathrooms
- Bedrooms: 3
- Bathrooms: 1
- Full bathrooms: 1
Rooms
- Room types: 3 Bedrooms, 1 Bath, Main Entry, Converted Garage
Bathroom
- Features: Shower Over Tub, Dual Flush Toilet
Kitchen
- Features: Counter - Solid Surface, Dishwasher, Eat-in Kitchen, Disposal, Gas Range/Cooktop, Ice Maker Hookup, Microwave, Range/Oven Free Standing, Refrigerator, Updated Kitchen
Heating
- Forced Air
Cooling
- Central Air
Appliances
- Included: Dishwasher, Gas Range, Plumbed For Ice Maker, Microwave, Free-Standing Range, Refrigerator, Dryer, Washer
- Laundry: Gas Dryer Hookup, Laundry Room
Features
- Counter - Solid Surface, Updated Kitchen
- Flooring: Hardwood, Tile, Carpet
- Basement: Crawl Space
- Has fireplace: No
- Fireplace features: None
Interior area
- Total structure area: 1,285
- Total interior livable area: 1,285 sqft
Video & virtual tour
Property
Parking
- Parking features: Carport, Converted Garage
- Has carport: Yes
Accessibility
- Accessibility features: None
Features
- Levels: One
- Stories: 1
- Patio & porch: Deck
- Pool features: None
- Fencing: Fenced
Lot
- Size: 5,227 Square Feet
- Features: 2 Houses / 1 Lot, Premium Lot, Front Yard, Landscaped, Back Yard
Details
- Parcel number: 84C75732
- Special conditions: Standard
Construction
Type & style
- Home type: SingleFamily
- Architectural style: Ranch
- Property subtype: Residential, Single Family Residence
Materials
- Stucco
- Roof: Composition
Condition
- Existing
- New construction: No
- Year built: 1949
Utilities & green energy
- Electric: No Solar
- Sewer: Public Sewer
- Water: Public
Green energy
- Energy efficient items: None
Community & HOA
Community
- Security: Carbon Monoxide Detector(s), Double Strapped Water Heater, Smoke Detector(s)
- Subdivision: Castro Valley
HOA
- Has HOA: No
Location
- Region: Castro Valley
Financial & listing details
- Price per square foot: $778/sqft
- Tax assessed value: $905,000
- Price range: $1M - $1M
- Date on market: 6/26/2026
- Listing agreement: Excl Right
- Listing terms: Cash,Conventional
Estimated market value
Not available
Estimated sales range
Not available
Not available
Price history
| Date | Event | Price |
|---|---|---|
| 6/26/2026 | Listed for sale | $999,950+0.2%$778/sqft |
Source:  Bay East AOR #41139746 Report a problem | ||
| 11/24/2021 | Sold | $998,000+14.1%$777/sqft |
Source: Bay East AOR #40973960 Report a problem | ||
| 11/11/2021 | Pending sale | $875,000+59.1%$681/sqft |
Source:  bridgeMLS/CCAR/Bay East AOR #40973960 Report a problem | ||
| 5/5/2005 | Sold | $550,000+37.5%$428/sqft |
Source: Bay East AOR #40071567 Report a problem | ||
| 8/15/2003 | Sold | $400,000+57.5%$311/sqft |
Source: Public Record Report a problem | ||
| 7/29/1999 | Sold | $254,000$198/sqft |
Source: Public Record Report a problem | ||
Public tax history
| Year | Property taxes | Tax assessment |
|---|---|---|
| 2025 | -- | $905,000 +1.7% |
| 2024 | $11,246 -12.1% | $890,000 -12.6% |
| 2023 | $12,796 +1.9% | $1,017,960 +2% |
| 2022 | $12,559 +37.7% | $998,000 +40.9% |
| 2021 | $9,123 +2.3% | $708,212 +1% |
| 2020 | $8,915 -1.8% | $700,952 +2% |
| 2019 | $9,081 +22.3% | $687,213 +10.5% |
| 2018 | $7,424 | $622,000 +10.5% |
| 2017 | $7,424 +7.9% | $563,000 +5% |
| 2016 | $6,880 +35.7% | $536,000 +22.1% |
| 2015 | $5,070 | $439,000 +8.9% |
| 2014 | $5,070 | $403,000 +13.5% |
| 2013 | -- | $355,000 |
| 2012 | -- | $355,000 -4.1% |
| 2011 | -- | $370,000 -14.9% |
| 2010 | -- | $435,000 +1.7% |
| 2009 | -- | $427,600 -26.7% |
| 2008 | -- | $583,660 +2% |
| 2007 | -- | $572,220 +2% |
| 2006 | -- | $561,000 +37.5% |
| 2005 | -- | $408,000 +2% |
| 2004 | -- | $400,000 +48.4% |
| 2003 | -- | $269,547 +2% |
| 2002 | -- | $264,261 +2% |
| 2001 | $2,888 | $259,080 |
Find assessor info on the county website
Monthly payment
Est. payment$--/mo
Payment breakdown
Explore the cost of this home by adjusting the details. Changes won't be saved.All calculations are estimates and provided by Zillow, Inc. for informational purposes only. Actual amounts may vary.
HOA fees may include property taxes on listings classified as Co-Ops. Contact the listing agent and/or owner for fee details.
Mortgage interest rates are dependent on a number of factors, including credit score, down payment, and repayment length. Interest rate data provided by Zillow Group Marketplace, Inc. as of 1/1/1970 from various mortgage lenders with which we have lead or other similar arrangements; the Estimated Payment is an average of those rates.
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Climate risks
Neighborhood: 94546
Nearby schools
GreatSchools rating
- 9/10Marshall Elementary SchoolGrades: K-5Distance: 0.3 mi
- 10/10Creekside Middle SchoolGrades: 6-8Distance: 0.7 mi
- 9/10Castro Valley High SchoolGrades: 9-12Distance: 0.3 mi
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- California
- Alameda County
- Castro Valley
- 94546
- 4231 Somerset Ave
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