Introduction
Accessory Dwelling Units (ADUs) have become a cornerstone of San Diego’s housing solutions, offering homeowners increased flexibility, rental income opportunities, and enhanced property value. At Proteus Homes, we specialize in building custom ADUs designed to simplify the home-building process. Using our proprietary building system, we deliver high-quality ADUs on-time and on-budget in a fraction of the time it takes for traditional on-site construction. Let’s explore the key regulations and guidelines for ADUs in San Diego to help you start your journey.
What Are Accessory Dwelling Units?
An Accessory Dwelling Unit (ADU) is a secondary residential unit located on the same lot as an existing or proposed single-family or multi-family dwelling. ADUs can be detached, attached, or converted from existing spaces such as garages or basements. These units are self-contained, featuring living, sleeping, cooking, and sanitation facilities.
ADU Size & Building Constraints
What is the setback requirement for an ADU in San Diego?
For single-story ADUs up to 16 feet tall, the side and rear setbacks can be as little as 0 feet. For taller or multi-story ADUs, a minimum setback of 4 feet applies for side and rear property lines. Front yard and street-side setbacks must adhere to underlying zoning requirements.
How many ADUs can you build on your property in San Diego?
On single-family lots, you may build:
- One detached or attached ADU.
- One Junior ADU (JADU) created from existing space within the primary dwelling.
- One affordable-income-restricted ADU.
- One bonus ADU (market-rate), provided zoning requirements are met.
In total, a property could host up to four ADUs if conditions are satisfied. Multi-family lots allow additional conversions of non-habitable spaces and detached ADUs.
How big can an attached ADU be in San Diego?
An attached ADU can occupy up to 50% of the primary dwelling’s square footage, with a maximum size of 1,200 square feet.
Can you build a 2-story ADU in San Diego?
Yes, 2-story ADUs are permitted, subject to setback, height, and zoning restrictions.
Can you convert a garage into an ADU or add an ADU on top of a garage in San Diego?
Yes, garage conversions and second-story ADUs over garages are allowed, provided they meet building code requirements.
Parking Requirements for ADUs in San Diego
Do ADUs require parking?
Parking requirements are minimal:
- No parking is needed for ADUs in most areas, especially within transit priority zones.
- Properties in the Coastal Overlay Zone may require one off-street parking space if in a Beach Impact Area.
Converted garages or carports do not need replacement parking, except in specific Coastal Overlay areas.
Permitting Process
How long does the permitting process take?
The City of San Diego aims to process ADU permits in 60-90 days. Pre-approved ADU plans are available to expedite the timeline.
Conclusion
Navigating San Diego’s ADU regulations can feel overwhelming, but partnering with Proteus Homes makes the process seamless. Our thoughtfully designed ADUs are built using a proprietary system that guarantees delivery on-time and on-budget, helping you unlock the potential of your property with ease. Whether you’re planning a simple garage conversion or a two-story detached ADU, Proteus Homes has the expertise to bring your vision to life.
Contact Us
We are happy to answer any questions you have. You can reach us at (760) 650-3050 or email us at info@proteus.homes. Visit us at our office located at 793 North Ave Suite C, Vista, CA 92083. Let Proteus Homes simplify your ADU journey and help you build a better future.