How to Get an ADU Permit in San Diego: A Simple Guide for Homeowners

San Diego has embraced the growing demand for Accessory Dwelling Units (ADUs)—also known as granny flats, in-law suites, or backyard homes. These small secondary housing units not only add living space but also increase property value and provide rental income opportunities. However, before breaking ground, homeowners must secure the proper permit. Here’s how to get an ADU permit in San Diego.

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1. Understand ADU Regulations in San Diego

San Diego offers one of the most ADU-friendly policies in California. Key highlights include:

• No minimum lot size requirement for building an ADU.

• Homeowners can add up to two ADUs on single-family lots, depending on space.

• Both attached and detached ADUs are permitted.

• Junior ADUs (JADUs), which are smaller units built within the existing home, are also allowed.

Knowing these basics ensures you design a unit that complies with city guidelines.

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2. Prepare Your ADU Design Plans

The first step is creating detailed plans for your ADU. These must include:

• Floor layout and dimensions

• Plumbing, electrical, and mechanical systems

• Site plan showing setbacks, parking (if required), and access
  Many homeowners hire an architect or a design-build contractor to prepare professional plans that meet city standards.

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3. Submit Your Application

Once your plans are ready, you’ll need to submit them to the City of San Diego’s Development Services Department (DSD). You can apply online through their permitting portal or in person.

Required documents generally include:

• ADU design and construction plans

• Completed application forms

• Proof of property ownership

• Fee payment (application and review fees)

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4. Plan Review and Approval

The city will review your application to ensure it complies with zoning, safety, and building codes. This process typically includes:

• Zoning review (setbacks, height, lot coverage)

• Building code compliance (plumbing, electrical, fire safety)

• Environmental review, if applicable

Approval timelines can vary, but San Diego has streamlined the ADU process to reduce wait times.

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5. Secure Your Permit and Start Building

Once approved, you’ll receive your official ADU building permit. With this in hand, construction can begin. Inspections will occur at different stages—foundation, framing, electrical, and final completion—to ensure compliance.

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Final Thoughts

Getting an ADU permit in San Diego may seem complex, but the city’s supportive policies make it easier than ever. With the right plans, paperwork, and patience, you can transform your property into a more valuable, versatile, and future-ready space.