Can You Build a 2-Story ADU in San Diego?

Building an Accessory Dwelling Unit (ADU) in San Diego is a great way to maximize your property’s potential, whether for rental income, accommodating family members, or increasing your home’s value. However, if you’re considering a 2-story ADU, there are specific regulations, guidelines, and practical considerations you need to be aware of before moving forward.

Understanding ADUs in San Diego

First, let’s clarify what an ADU is. An Accessory Dwelling Unit is a secondary housing unit on a single-family residential lot. It’s typically smaller than the main home and can be attached, detached, or even a converted part of the existing home. San Diego, like many cities in California, has embraced ADUs as a solution to housing shortages, making it easier for homeowners to build them.

Can You Build a 2-Story ADU in San Diego?

Yes, you can build a 2-story ADU in San Diego, but there are important factors to consider:

1. Zoning Regulations: San Diego’s zoning laws will significantly influence what you can build. In most residential zones, 2-story ADUs are allowed, but the specific zoning of your property will determine height restrictions, setbacks, and other requirements. It’s crucial to check with the City of San Diego’s Development Services Department or consult with a professional who can help you navigate these regulations.
2. Height Limits: While 2-story ADUs are permissible, they must comply with height restrictions specific to your property’s zone. Typically, height limits for ADUs in San Diego range from 16 to 30 feet, depending on the lot size and location. This ensures that the ADU remains compatible with the surrounding neighborhood.
3. Setback Requirements: Setbacks, or the distance from the property line to the structure, are another key factor. For 2-story ADUs, rear and side setbacks are usually required to be greater than those for single-story ADUs, often around 4 to 10 feet. This varies depending on your lot’s zoning and dimensions.
4. Floor Area Ratio (FAR): The size of your 2-story ADU will also be governed by the Floor Area Ratio (FAR), which limits the total building area on your lot relative to its size. San Diego allows up to 1,200 square feet for detached ADUs, but this could be less if your lot is small or has an existing high FAR.
5. Design Considerations: San Diego encourages ADUs that blend with the existing neighborhood character. Therefore, the design, materials, and aesthetics of your 2-story ADU may need to align with the main home or other structures in the area to gain approval.

Steps to Building a 2-Story ADU in San Diego

1. Research Local Regulations

Before you start planning, research the local ADU regulations specific to your property. The City of San Diego provides resources online, or you can speak directly with the Development Services Department.

2. Hire a Professional

Given the complexity of building a 2-story ADU, hiring an architect or a builder familiar with San Diego’s ADU requirements is highly advisable. They can ensure your design complies with all local laws and help streamline the permitting process.

3. Submit Plans for Approval

Once you have your plans ready, you’ll need to submit them to the city for approval. This includes architectural drawings, site plans, and possibly environmental reviews, depending on your location. The approval process can take several weeks, so plan accordingly.

4. Secure Permits

After your plans are approved, the next step is to secure the necessary building permits. This ensures that your construction will meet all safety and building codes.

5. Begin Construction

With permits in hand, you can begin construction. Regular inspections will be conducted by the city throughout the building process to ensure compliance with your approved plans.

Benefits of Building a 2-Story ADU

1. Maximized Space: A 2-story ADU allows you to double the living space without taking up additional yard space, making it ideal for smaller lots.
2. Increased Property Value: Adding a 2-story ADU can significantly increase your property’s value, particularly in a high-demand market like San Diego.
3. Rental Income Potential: With more space, a 2-story ADU can attract higher rental income compared to a single-story unit.
4. Flexible Living Arrangements: Whether it’s for extended family, a home office, or as a rental, a 2-story ADU offers more versatility in how the space is used.

Potential Challenges

While there are many benefits, it’s also important to consider potential challenges:

• Higher Construction Costs: Building a 2-story ADU is typically more expensive than a single-story due to the complexity of the construction and additional materials needed.
• Approval Delays: The approval process for a 2-story ADU can be more complicated and time-consuming, especially if your design doesn’t meet all local guidelines.
• Neighbor Concerns: Depending on your location, neighbors might have concerns about privacy or the impact on neighborhood character, which could complicate the approval process.

In conclusion, building a 2-story ADU in San Diego is not only possible but can be a highly rewarding investment. However, it requires careful planning, adherence to local regulations, and a thoughtful approach to design. By understanding the key factors involved and working with professionals, you can successfully add a 2-story ADU that enhances your property’s value and meets your family’s needs.