How to Get an ADU Permit in San Francisco

Looking to build an ADU (Accessory Dwelling Unit) in San Francisco? Whether you’re creating a rental unit, a home for family, or adding property value, understanding the ADU permit process is your first step. San Francisco’s streamlined ADU program encourages homeowners to add secondary units—but it comes with specific requirements you need to follow.

What Is an ADU?

An ADU (Accessory Dwelling Unit) is a self-contained living space located on the same lot as a primary home. It can be a converted garage, basement apartment, detached backyard cottage, or part of the main house. ADUs typically include a kitchen, bathroom, sleeping area, and separate entrance, making them ideal for rental income, multigenerational living, or guest accommodations. They offer a flexible and cost-effective way to add housing without the need for major new construction. Increasingly popular in urban areas, ADUs help address housing shortages while maximizing property value.

Step-by-Step: How to Get an ADU Permit in San Francisco

1. Check Zoning Requirements

Verify that your property is eligible for an ADU under San Francisco Planning Department zoning codes. Most residential lots qualify, especially under SB9 and local incentives.

2. Pre-Application Research

Use the SF Planning Department's Property Information Map to check your lot’s eligibility, historic status, and any specific neighborhood restrictions.

3. Hire an Architect or Designer

A professional can ensure your plans meet local building codes, setbacks, and size limits.

4. Submit Your ADU Permit Application

File your application through the San Francisco Department of Building Inspection (DBI). Include plans, structural calculations, and energy compliance documents.

5. Planning Review and Approvals

Your application will be reviewed for zoning, fire safety, rent control impacts, and code compliance. Fast-track ADUs may qualify for expedited review.

6. Get Building Permits and Start Construction

Once approved, you can obtain your construction permits and begin building your ADU.

Benefits of Building an ADU in San Francisco

🔑 1. Increase Property Value:

Adding an ADU can significantly boost your home’s market value. With housing in high demand, properties with legal second units often sell for more and appeal to a broader range of buyers.

💰 2. Earn Passive Rental Income:

Rent out your ADU to long-term tenants or use it as a short-term rental (where permitted) to create a steady income stream. Many homeowners use rental revenue to offset mortgage payments or build savings.

🏠 3. Flexible Living Space for Family:

ADUs are perfect for multi-generational living. Use them to house aging parents, adult children, or live-in caregivers—while giving everyone their own private space.

🛠️ 4. Cost-Effective Expansion:

Instead of moving to a larger home, an ADU allows you to expand your usable space on your current lot—often for less than the cost of buying a new property in SF’s competitive market.

🏙️ 5. Support Affordable Housing in SF:

By creating more residential units, you’re directly contributing to San Francisco’s housing goals. ADUs help ease the housing shortage without changing neighborhood character.

🚫 6. No Extra Parking Required:

Thanks to California state laws and local ordinances, you’re not required to add parking when building an ADU, which simplifies the permitting process—especially in dense areas.

🔓 7. Take Advantage of Streamlined Permitting:

San Francisco offers fast-track ADU permitting for eligible properties, helping you move from design to construction with fewer delays.

🌱 8. Sustainable Development Option:

Smaller homes like ADUs have a lower environmental footprint, require fewer materials, and are ideal for energy-efficient upgrades, making them a greener way to grow.

How Much Does an ADU Permit Cost in San Francisco

Permit Component	Estimated Cost
Building Permit Fees	$3,000 – $7,000
Plan Review Fees	$1,000 – $2,500
Plan Review Fees	$1,000 – $3,000+
Utility Connection Fees	$2,193 per missing tree
Street Tree In-Lieu Fee	$2,000 – $5,000+
Total Estimated Fees	$3,000 – $11,000

FAQ

How long does it take to get an ADU permit in San Francisco?

The timeline can vary. Expedited reviews may take 4–6 months. Traditional routes can take 6–12 months depending on complexity.

How much does an ADU permit cost in SF?

Permit fees vary based on the scope of your project, but expect to pay between $5,000–$15,000 in city fees.

Can I build a detached ADU in my backyard?

Yes! Detached ADUs are allowed on most single-family and multifamily lots, subject to setbacks and height limits.

Do I need to provide parking for my ADU?

No additional parking is required for ADUs in San Francisco, per state and local laws.

Can I convert my garage into an ADU?

Absolutely. Garage conversions are one of the most popular and cost-effective ADU types in San Francisco.