Accessory dwelling unit permit cost

Looking for accessory dwelling unit permit cost 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.

About this service

Permit fees are paid to your local municipality and fluctuate based on the specific city or county where your property is located. These costs cover plan reviews, impact fees, and safety inspections required to make your new space legal and compliant. Because every jurisdiction has a different fee structure, the final amount depends on your specific town’s regulations. We help you estimate these during the planning phase. Exact pricing confirmed free on the call.

Frequently asked in San Francisco

What are the disadvantages of ADUs?

Disadvantages can include significant upfront construction costs and potential impacts on your property's limited yard space in San Francisco. You'll also want to consider factors like privacy and noise for existing residents. It's about finding the right balance for your specific needs in a dense urban environment.

How much does an ADU cost in California?

Costs for an ADU in California, especially in San Francisco, are high due to labor and material expenses and complex regulations. Factors like foundation type, finishes, and potential seismic retrofitting significantly influence the final price. A personalized quote is essential for an accurate figure.

What are the rules for ADUs in California?

California has strong state laws promoting ADUs, but San Francisco has its own specific zoning ordinances and building codes. These cover aspects like height limits, setbacks, and impact fees, which can be substantial. Understanding these local rules is crucial for a smooth permitting process.

Is ADU allowed in Maryland?

This information pertains to San Francisco, California. Maryland has its own distinct regulations for accessory dwelling units that differ from California's. For Maryland-specific ADU rules, you would need to consult local planning and zoning departments in that state.

Eligibility and availability can vary, so it's important to verify current programs with local agencies or the professionals you consult. These programs often have specific criteria.

What is the accessory dwelling unit permit cost?

Permit costs in San Francisco are calculated based on the project's valuation and include planning, building, and potentially impact fees. These fees can be substantial due to the city's complex regulatory environment. A professional can provide a more precise estimate based on your planned ADU.

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