Accessory dwelling unit services

Looking for accessory dwelling unit services in San Francisco, CA? Call AccessoryDwellingUnit Solutions 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 several moving parts that shape your total budget. The biggest factor is whether you choose a prefabricated unit or a custom build on-site. Site preparation is also significant; if your land requires extensive grading, utility trenching, or foundation work, costs will climb. Your choice of finishes—like kitchen cabinetry, flooring, and siding materials—also shifts the bottom line. We help you navigate these variables to find a setup that fits your property. Exact pricing confirmed free on the call.

About this service

These services cover the entire lifecycle of a backyard home, from initial property assessments to navigating local permit applications. You need this when you want to add living space but don't want to handle the complex zoning paperwork or design requirements yourself. Professionals guide you through the rules to ensure your project stays compliant with state and city codes while maximizing your property’s potential for rental income or housing family members.

Frequently asked in San Francisco

What are the disadvantages of ADUs in San Francisco?

How much does an ADU cost in California?

The cost of an ADU in California, including San Francisco, is highly variable due to size, materials, and site conditions. Factors like foundation requirements, utility connections, and interior finishes significantly influence the final price. For an accurate cost assessment tailored to your San Francisco property, a personalized quote is necessary. We can help arrange that.

What are the rules for ADUs in California?

Is an ADU allowed in Maryland?

This service is tailored for San Francisco, California. For information on ADU regulations in Maryland, you would need to consult local authorities in that state. Our focus is on providing expert ADU services and guidance within San Francisco, ensuring compliance with California and San Francisco city ordinances. We are here to help with your San Francisco project.

What are the rules for ADU in California?

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: Sunset District, Mission District, Richmond District, Nob Hill, Haight-Ashbury — and every surrounding area.