Prefab ADU in South San Francisco | Build with LiveLarge

South San Francisco ADU Standards

Prefab ADU in South San Francisco

What is an Accessory Dwelling Unit (ADU)?

An ADU is an independent residential unit on the same lot as a primary home, providing additional living space, rental opportunities, or multi-generational housing. A Prefab ADU is a permanent, factory-built backyard home that meets local zoning and building codes, making it ideal for long-term living.

Tiny homes, often confused with prefab ADUs, are small, mobile units built on wheels. While both can be ADUs, prefab ADUs are stationary and built to last, while tiny homes face more zoning challenges due to their mobility.

There are different types of ADUs:

Attached ADU: Added to a primary residence (new construction).
Detached ADU: A freestanding structure (new construction).
Converted ADU: Located within an existing home or accessory structure.

Planning to Build an ADU in South San Francisco?

LiveLarge specializes in designing and building ADUs, including prefab ADUs and backyard homes, that meet local regulations while optimizing your space. Our team of experts will guide you through the entire process, from permits to design and construction, ensuring your ADU project is seamless and stress-free.

Zoning and Lot Size:

ADUs are permitted on any lot that allows a single-unit or multiple-unit residential dwelling. Whether it’s a single-family or multi-family lot, prefab ADUs can be an excellent addition.

Lot Size and Floor Area:

Junior ADU: Max 500 sq. ft.
Studio or 1-Bedroom ADU: Max 800 sq. ft.
2+ Bedroom ADU: Max 1,000 sq. ft.

ADUs converted from existing structures are not subject to size limitations unless new space is added, offering flexibility for modular homes and prefab ADUs.

Setbacks and Height:

Detached ADUs:
- One-story: No setbacks required.
- Two-story: Must have a minimum 4-foot setback, with a height limit of 18 feet.
Attached ADUs: Must comply with setbacks and zoning regulations of the existing structure.

Design and Layout:

Kitchen: Must include a full kitchen with sink, stove, counter space, and refrigerator.
Bathroom: A full bathroom with a sink, toilet, and shower/bathtub is required.
Storage: At least 60 sq. ft. of storage space must be provided.
Entrance: ADUs must have a separate exterior entrance.

Parking:

Junior ADUs: No parking required.
ADUs: No parking required unless within a special overlay, such as the Hillside Overlay, or certain other exceptions.

Additional Design Guidelines:

Building Separation: Detached ADUs must maintain a separation of 4-8 feet.
Architectural Features: Projections like eaves and bay windows may extend up to 2 feet into setbacks, as long as a 2-foot setback is maintained from property lines.
Roof Decks: Not permitted in certain areas, but allowed in others.

Rental and Occupancy:

Rental Restrictions: ADUs and Junior ADUs cannot be rented out for less than 30 days.
Owner Occupancy: The owner must live in either the primary dwelling or the Junior ADU. ADUs can be rented separately from the primary residence.

For more information, visit the City of South San Francisco’s official ADU page. Let LiveLarge help you transform your property with a well-planned ADU. Whether you’re looking for a prefab ADU, backyard home, or modular home, our expertise in design and construction ensures your project meets local standards while maximizing your space. Contact LiveLarge today to begin building your ideal backyard home!

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