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Prefab ADU in San Francisco County

Abodu makes and installs prefab homes for play, passive income and possibility in as little as 6 months.

About San Francisco County

San Francisco County is renowned for the historic Golden Gate Bridge, bustling Fisherman's Wharf, and vibrant neighborhoods like Chinatown and the Mission District. As the housing needs continue to grow, residents are exploring alternative housing solutions, and prefab Accessory Dwelling Units (ADUs) are a promising option. A prefab ADU is a secondary housing unit built on the same lot as a primary residence and can serve as a space for family, a rental opportunity, or simply a place for relaxation and creativity.

What are the benefits of having an ADU?

ADUs offer several advantages for homeowners. They can provide additional rental income, accommodate family members, increase property value, and contribute to the community by addressing housing shortages. Moreover, as prefab units are constructed off-site and delivered ready to be installed, they promise a faster, more efficient, and less disruptive building process compared to traditional construction methods.

An Abodu One being installed with a crane.

An Abodu One being installed with a crane.

San Francisco County ADU requirements

When planning to build a prefab ADU in San Francisco County, you must adhere to specific requirements. The City and County of San Francisco website is the best place to learn about ADU requirements.


How much does an ADU cost in San Francisco County?

Estimate the cost by using the ADU calculator tool, which is offered by the county's Planning Department.

Building Permits

How do I get an ADU permit in San Francisco County?

The permitting process for building an ADU involves submitting detailed plans and documentation—such as floor plans, energy calculations, and engineering data—to the county planning department for review. The office will permit the homeowner or ADU company if the plans comply with local building codes and regulations.


What are the top ADU requirements in San Francisco County?

Since ADUs are functional living spaces separate from the primary residence, California law requires secondary units to have access to basic utilities like water, sewage, and electricity. Additionally, each city within San Francisco County may have specific requirements for ADU utilities like fire sprinklers and water meters.


How do I finance an ADU in San Francisco County?

FAQs: Prefab ADUs in San Francisco County

Fee schedules for ADU permits in San Francisco County vary by city and unit size, but you can expect to pay a few thousand dollars. Find more information on your city's permitting page. Our Abodu Project Managers handle the permitting process for all prefab ADU builds.

California state law mandates a minimum distance of 4 feet between the ADU and a homeowner’s property line.

In San Francisco County, ADUs may not exceed a floor area of between 850 square feet and 1,000 square feet depending on several factors, including the number of bedrooms.

ADUs usually come equipped with several essential appliances, including, but not limited to:

  • Stove or cooktop

  • Refrigerator

  • Oven

  • Dishwasher

  • Washer and dryer

  • Water heater

  • HVAC system

From Cow Hollow to West Portal, Abodu is ready to help you navigate the process of adding a beautiful, functional ADU to your home in San Francisco.

Get your backyard assessment.

Upgrade your property with a custom prefab ADU by Abodu. We off full end-to-end service, including permitting, site work, construction, and delivery. Schedule a call or visit our showroom today.

A crane installing an Abodu.
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