Adu Permit in San Francisco, CA | AccessoryDwellingUnit Experts

Looking for adu permit in San Francisco, CA? Call AccessoryDwellingUnit Experts 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 major project, and the final bill depends on a few key things. Site prep is a big factor; if your land is sloped or needs extensive utility connections, costs go up. The materials you choose—from siding to kitchen finishes—also change the math significantly. Whether you’re building a detached unit or converting an existing garage shifts the permit requirements and structural work needed. We provide exact pricing confirmed free on the call.

About this service

Getting an ADU permit is the legal process of obtaining local government approval for your building project. You cannot legally construct or occupy an ADU without this documentation. You need this service before any construction begins to ensure your build meets building codes and safety regulations.

Frequently asked in San Francisco

What are the benefits of a modular accessory dwelling unit in San Francisco?

Modular ADUs in San Francisco can offer faster construction times. They are built off-site in a controlled environment. This can lead to fewer weather delays. They also tend to have more predictable costs. This makes them an attractive option for homeowners. They provide a quicker path to new living space.

Where can I find the best accessory dwelling unit in San Francisco?

What is the cost of an accessory dwelling unit in San Francisco?

What are local ADU regulations in San Francisco?

What is involved in backyard accessory dwelling unit construction in San Francisco?

Backyard ADU construction in San Francisco involves detailed planning. Pros assess site access, utility connections, and soil conditions. They secure necessary permits, then build the foundation, frame the structure, and install utilities. Finishing touches complete the unit. It's a comprehensive building process.

How do I find an ADU builder in San Francisco?

What are accessory dwelling unit homes like in San Francisco?

Accessory dwelling unit homes in San Francisco are designed to fit various property types. They can be attached to existing homes, built above garages, or be detached backyard structures. They offer flexible living solutions for homeowners. They can be used for family, guests, or rental income.

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: Richmond District, Sunset District, Mission District, Noe Valley, Pacific Heights — and every surrounding area.