* * Rare Dual Residence | Cardiff's Coveted Composer District * * Where coastal rhythm meets refined living. Discover an extraordinary opportunity- Two impeccably appointed residences on one coveted parcel in the heart of Cardiff-by-the-Sea, where the salt air is soft and the lifestyle is simply unmatched. * * The Main Residence * * has been meticulously transformed with an elevated coastal aesthetic. Sun-drenched interiors, wide-plank flooring & curated finishes create an effortlessly sophisticated atmosphere. The chef-inspired kitchen; featuring custom cabinetry, premium appliances & generous counter space, flows seamlessly for both laid-back mornings & elevated entertaining. * * The 1 BDRM ADU * * is a fully independent, turnkey retreat set privately on the oversized lot. With its own kitchen, bath & living areas, this beautifully finished residence invites endless possibilities: a serene guest haven, creative studio, multigenerational sanctuary or high-yield coastal rental. The legendary Composer District offers a walkable, village-soul lifestyle steps from Cardiff and Encinitas beaches, the tranquil San Elijo Lagoon, acclaimed dining, boutique shops, and vibrant weekly farmers' markets. Two beautifully finished homes. One prestigious coastal address. Infinite potential — to live, host, create, or invest. This is North County coastal living at its most refined. ~Live in Perfect Harmony~A Rare Dual Residence in Cardiff's Coveted Composer District. Tucked within the highly coveted Composer District of Cardiff-by-the-Sea, 421 & 423 Bach Avenue offers a singular opportunity: two impeccably appointed residences on one exceptional parcel: An uncommon configuration that delivers unparalleled flexibility, privacy, and long-term value in one of coastal San Diego’s most sought-after enclaves. 421 Bach has been transformed with meticulous care and elevated taste. Bathed in natural light, the interiors unfold in a seamless open-concept design that balances sophisticated elegance with everyday livability. High-end finishes, wide-plank premium flooring, and thoughtfully curated details create a refined yet welcoming atmosphere. The heart of the home is a chef-inspired kitchen featuring custom cabinetry, premium appliances, and expansive counter space; ideal for intimate family mornings or effortless entertaining of friends and clients alike. Set privately on the same oversized lot, 423 Bach Avenue is a fully independent, turnkey Accessory Dwelling Unit (ADU). Complete with its own kitchen, bath, living areas, and thoughtful finishes, this private retreat offers endless possibilities: a luxurious guest suite for visiting family or friends, a serene creative studio or home office, elegant multi-generational living, or a high-yield rental in a coastal market where demand consistently outpaces supply. This is more than a home, it is a lifestyle asset in the heart of North County’s premier coastal community. The Composer District is renowned for its walkable, village-like charm and tight-knit character. From your doorstep, enjoy effortless access to top-rated schools, scenic neighborhood parks, and the pristine sands of Cardiff and Encinitas beaches. The vibrant downtown scenes of both Cardiff-by-the-Sea and Encinitas, with their acclaimed restaurants, boutique shopping, weekly farmers’ markets, and sophisticated coastal vibe-all just minutes away. Nearby San Elijo Lagoon adds a layer of natural beauty and tranquility that defines this rare stretch of Southern California coastline. In a market where true dual-residence opportunities are exceptionally scarce, 421 & 423 Bach stands apart. Two beautifully finished homes. One prestigious address. Infinite potential for how you choose to live, host, create, or invest. This is coastal San Diego living, refined, connected, and quietly extraordinary.
Est. $5,354 per month, based on comparable rentals
Sale and tax history for 421-23 Bach St
Sale History
Tax History
Date
Event
Price
SDMLS #260009273
Jun 2, 2026
Sold
$6,400,000
$1,499/sq ft
May 3, 2026
Pending
—
Apr 21, 2026
Listed
$6,499,000
$1,522/sq ft
CRMLS #100018889
Jun 30, 2010
Sold
$1,385,000
$324/sq ft
Mar 29, 2010
Listed
$1,449,900
$340/sq ft
NOT a Short Sale. West of I5 walk to the beach. Beautiful Craftsman single story on large lot. Private cul-de-sac street. Kitchen with granite slab kitchen counters, island, SS appliances, breakfast nook. Kitchen/Family great room with fireplace and custom built-in entertainment center. Crown molding through out. Large bedrooms all have generous walk-in closets. Must see!
CRMLS #90054441
Mar 15, 2010
Listing Removed
—
Sep 24, 2009
Listed
$1,499,900
$351/sq ft
As the MLS and public records start to fill up, we'll list the details here.
Public record
Public record
Zoning
Beds
—
Baths
—
Stories
—
Lot width
—
Lot depth
—
Lot size
—
Year renovated
—
Sq. Ft.
—
Year built
—
Style
Single Family Residential
County
San Diego County
APN
2606511700
Parking Spaces
—
Basement
—
Accessible
—
HOA Dues
—
Garage
—
Features
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Last updated by owner on Feb 25, 2026.
R3
C/NRO
Residential 3 Zone
Residential 3 is intended to provide for single-family detached residential units with minimum lot sizes of 14,500 net square feet and maximum densities of three units per net acre, as a rural to suburban transition. One primary dwelling is permitted on each legal lot. Single-family units may be attached to other single-family units provided each unit is located on a separate legal lot with approval of a PRD.
Zone overlays
Cultural/Natural Resources Overlay Zone
Permitted uses
Include but are not limited to:
Housing-Single unit
Housing-Senior
Housing-Other
Infrastructure
Educational/school
Agriculture-Pastureland
Housing-Mobile home park
Property details
Parking
Parking/Garage Information
# of Parking Spaces Total: 6
Has Garage
Has Attached Garage
# of Garage Spaces: 3
Parking Features: Garage Door Opener, Attached, Garage
Interior
Virtual Tour
Bedroom Information
# of Bedrooms Possible: 6
Bathroom Information
# of Full Bathrooms: 4
# of Half Bathrooms: 1
Heating & Cooling
Has Cooling
Cooling: Central Air
Has Heating
Heating: Radiant, Fireplace(s), Forced Air, Natural Gas, Solar
Interior Features
Appliances: Dishwasher, Disposal, Dryer, Microwave, Refrigerator, Trash Compactor, Washer, Water Softener, Built-In Range, Convection Oven, Double Oven, Freezer, Gas Oven, Ice Maker, Self Cleaning Oven, Gas Range, Water Purifier, Cooktop, Gas Cooktop, Range, Oven, Range Hood, Exhaust Fan
Flooring: Carpet, Wood
Has Fireplace
# of Fireplaces: 4
Fireplace Features: Electric, Fire Pit, Gas, Family Room, Living Room, Master Bedroom, Outside
Exterior
Exterior Features
Exterior Features: Barbecue
Patio And Porch Features: Porch
Fencing: Full, Wrought Iron, Wood
Roof: Concrete
Pool Information
Has Private Pool
Pool Features: Private, Solar Heat, Heated, In Ground
Has Spa/Hot Tub
Spa Features: Private
Building Information
Sq. Ft.: 4270.0
# of Stories Total: 1
Construction Materials: Stucco
Property Features
Security Features: Fire Sprinkler System
Green Energy Generation: Solar
Pets Allowed: Yes
Property Information
Property Type: Residential
Property Sub Type: Single Family Residence
Raw Mls Property Sub Type: Detached
Land Information
Irrigation Source: Automatic,Sprinklers
Lot Information
Lot Features: Cul-De-Sac
Road Responsibility: Private Maintained Road
Lot Size : .25 to .5 AC
Lot Size Area: 0.42
Lot Size Units: Acres
Utilities
Utility Information
Water Source: Public
Sewer: Public Sewer
Location
HOA Information
Has Homeowners Association
Association Fee: $120
Association Fee Frequency: Monthly
Derived Association Fee (Monthly): $120
Schools Information
Elementary School District: Cardiff School District
Middle Or Junior School District: San Dieguito High School Distric
High School District: San Dieguito High School Distric
Location Information
Directions: WEST OF I-5, EXIT SANTA FE, SOUTH ON RUBENSTEIN, LEFT BACH, ON RIGHT
Subdivision Name: CARDIFF BY THE SEA
Community Information
Community Features: Curbs, Sidewalks
Public facts
Beds: —
Baths: —
Sq. Ft.: —
Stories: —
Lot Size: —
Style: Single Family Residential
Year Built: —
Year Renovated: —
County: San Diego County
APN: 2606511700
Home facts updated by county records on Feb 25, 2026
Other
Listing Information
List AOR: San Diego Association of REALTOR
Around this home
Schools
Cardiff Elementary School
Public K-2 • Assigned • 0.4mi
Oak Crest Middle School
Public 7-8 • Assigned • 1.2mi
7/10
La Costa Canyon High School
Public 9-12 • Assigned • 4.2mi
9/10
Provided by GreatSchools
Climate risks
1/10 Flood Factor
Minimal risk of a flood reaching the building in the next 30 years
1/10 Fire Factor
Unlikely to be in a wildfire in next 30 years
4/10 Heat Factor
5 days above 84° expected this year, 14 days in 30 years
1/10 Wind Factor
Minimal risk of severe winds over next 30 years
4/10 Air Factor
4 unhealthy days expected this year, 4 days in 30 years
Provided by First Street
Historical weather
Cardiff, CA • 92007
Average low and high temperatures (°F)
65
49
64
51
66
53
66
55
67
59
69
62
73
66
73
65
74
66
70
58
67
53
64
51
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Sun exposure
92/ 100
Exceptional sunlight
Sunscore
There appears to be minimal shading by surrounding buildings, terrain, and vegetation.
10.2 hrs
7 hrs
JuneDecember
Provided by Shadowmap
Estimated sale price
$6.20M – $7.51M
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