Looking for accessory dwelling unit companies in San Francisco, CA? Call AccessoryDwellingUnit Direct 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 involves variables that shift your total investment. The footprint size and complexity of the architectural design are primary factors. Are you planning a detached unit that requires new utility trenching, or is this a garage conversion that uses existing plumbing? Site accessibility, soil conditions, and your choice of finishes—like luxury flooring versus standard options—also play significant roles. Permitting fees vary widely depending on your local municipality and current zoning requirements. Exact pricing confirmed free on the call.

About this service

ADU companies provide end-to-end solutions, often integrating design, permitting, and construction under one roof. You need to engage a company when you want a streamlined experience and want to avoid the stress of hiring separate architects and builders. These companies handle the coordination of the entire project, ensuring that every phase of development transitions smoothly while keeping you updated on the progress and budget status of your new unit.

Frequently asked in San Francisco

What are the disadvantages of ADUs?

Potential disadvantages include the significant upfront construction costs and the complexities of working within San Francisco's dense urban environment. Navigating local zoning laws and ensuring adequate utility connections are also key considerations. A professional assessment can clarify these points.

How much does an ADU cost in California?

What are the rules for ADUs in California?

California has statewide ADU laws, but San Francisco has its own specific and often stringent regulations. These can cover density limits, parking requirements, and design standards. Understanding these local nuances is critical for a successful project.

Is ADU allowed in Maryland?

What are the rules for ADU in California?

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

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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: Outer Sunset, Nob Hill, Mission District, Richmond District, Pacific Heights — and every surrounding area.