Accessory dwelling unit companies

Looking for accessory dwelling unit companies in San Francisco, CA? Call AccessoryDwellingUnit Pros for a contact a provider — no obligation. Licensed adu builders serve San Francisco and the surrounding area, and you'll get straight answers on timing and what affects the price.

Last updated: September 24, 2026

What affects the price

Building an ADU is a custom project, so costs vary based on your specific choices. Site conditions are the biggest factor; if your land requires significant grading, utility extensions, or foundation work, those expenses add up quickly. Choosing high-end finishes, custom cabinetry, or complex roof lines will also push the budget higher compared to a standard design. Prefabricated units often offer predictable costs, while custom site-built structures allow for more flexibility but can be harder to estimate upfront. Exact pricing confirmed free on the call.

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Frequently asked in San Francisco

What are the disadvantages of ADUs in San Francisco?

Disadvantages in San Francisco can include the high cost of construction due to city regulations and labor. You also need to consider the impact on your existing property's privacy and yard space. However, the potential for rental income in such a desirable market is significant.

How much does an ADU cost in California?

What are the rules for ADUs in California?

California has statewide ADU laws designed to streamline development, but San Francisco has its own stringent local ordinances. These cover everything from minimum lot sizes to height restrictions and owner-occupancy requirements. The pros can clarify these for your specific location.

Is an ADU allowed in California?

Yes, accessory dwelling units are allowed and encouraged throughout California. San Francisco, despite its density, has specific programs and regulations to facilitate ADU construction. Compliance with local rules is paramount.

What are the rules for ADUs in San Francisco?

San Francisco has detailed zoning codes and building regulations for ADUs. These include requirements for setbacks, maximum unit size, and limits on the number of ADUs per parcel. Navigating these rules is essential for a successful project.

Also serving nearby: Daly City · Richmond · San Mateo · Berkeley · Oakland

All cities in California →

More on this: HUD ADU resources — ADU policy and financing research.

Service area details

808,988residents

17,323per sq mile

8ZIP codes served

Serving all of San Francisco — population 808,988; about 17,323 residents per square mile across 46.7 sq mi. ZIP codes covered include 94102, 94103, 94104, 94105, 94107, 94108, 94109, 94110.

Neighborhoods served in San Francisco: The Mission, Sunset District, Richmond District, Nob Hill, Pacific Heights — and every surrounding area.