Adu Services in San Francisco, CA | AccessoryDwellingUnit Experts

Looking for adu services 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

ADU services are the professional steps required to transform your backyard or garage into a functional living space. This process involves design consultations, structural engineering, and utility connections. You should look into these services if you are ready to increase your property value or need extra living space for relatives. We focus on making sure your project meets all safety codes and neighborhood regulations while fitting the specific design style of your main home.

Frequently asked in San Francisco

What are the benefits of prefabricated accessory dwelling units in San Francisco?

Prefabricated accessory dwelling units in San Francisco can offer faster construction times and potentially more predictable costs. Since components are built off-site, on-site disruption is minimized. This is beneficial in a dense urban environment. We can discuss if a prefab ADU is right for you. Call for a consultation.

How much does an accessory dwelling unit cost in San Francisco?

What are the requirements for homes with mother-in-law suites in San Francisco?

Homes with mother-in-law suites in San Francisco are typically built as accessory dwelling units. This means they must comply with city zoning regulations, including parking and occupancy rules. We can help you understand these specific requirements. Contact us to discuss your mother-in-law suite plans.

How can I find affordable ADU options in San Francisco?

What are the key steps in ADU construction in San Francisco?

Key steps in ADU construction in San Francisco include design, obtaining permits, site preparation, and building the structure. Utility connections, interior finishing, and final inspections are also critical phases. We guide you through this comprehensive process. Call us to begin your ADU construction.

Are there specific companies that specialize in accessory dwelling units in San Francisco?

What are accessory dwelling units (ADUs) and how do they work in San Francisco?

Accessory dwelling units (ADUs) in San Francisco are secondary housing units on a single-family lot. They provide additional housing options and can be attached or detached. They must comply with city zoning and building codes. We can explain how ADUs function in San Francisco. Call for details.

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 Castro, North Beach, Mission District, Pacific Heights, Sunset District, Richmond District — and every surrounding area.