How to Build an ADU on Your Property in San Diego: A Step-by-Step Guide

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How to Build an ADU on Your Property in San Diego: A Step-by-Step Guide

ADU Cost Breakdown: San Diego Homeowners' Guide

Accessory Dwelling Units (ADUs) have become increasingly popular in San Diego, offering homeowners a way to add value to their property, generate rental income, or provide housing for family members. Whether you're considering a detached unit in your backyard or a garage conversion, understanding the process is key. Here’s a step-by-step guide to help you navigate building an ADU in San Diego.

Step 1: Understand What an ADU Is

An ADU is a secondary housing unit built on a residential property. In San Diego, there are several types of ADUs, including:

  • Detached ADU: A separate unit on your property.
  • Attached ADU: An extension of your existing home.
  • Garage Conversion: Converting an existing garage into a living space.
  • Junior ADU (JADU): A smaller unit (up to 500 square feet) within your home.

San Diego’s regulations are ADU-friendly, thanks to state laws encouraging more housing options, but there are specific guidelines you’ll need to follow.

Step 2: Review Zoning and Property Eligibility

Before starting, verify that your property is eligible for an ADU. Here are some key considerations:

  • Zoning: Most residential zones in San Diego allow ADUs. Check your property’s zoning designation using the San Diego Zoning Map.
  • Lot Size: There are no minimum lot size requirements for ADUs in San Diego.
  • Existing Structures: Ensure the planned ADU complies with setbacks, height limits, and other design requirements.

Step 3: Plan Your ADU Design

Next, work with a designer, architect, or contractor to create a plan that meets your needs and aligns with city regulations. Key factors to consider:

  • Size: ADUs in San Diego can be up to 1,200 square feet, depending on your lot size and existing structures.
  • Setbacks: ADUs typically require a 4-foot setback from property lines.
  • Height: Detached ADUs can go up to 16 feet tall, with some exceptions allowing heights up to 30 feet.
  • Parking: No additional parking is required if your property is within a half-mile of public transit.

Step 4: Obtain Permits

San Diego requires permits for all ADUs. Here’s how to go about it:

  1. Submit Plans: Work with your designer to submit detailed plans to the San Diego Development Services Department (DSD).
  2. Plan Check: The city will review your plans for compliance with building codes, zoning laws, and ADU-specific regulations.
  3. Pay Fees: Permit fees depend on the size and complexity of your project. San Diego has waived certain impact fees for ADUs under 750 square feet to make them more affordable.

Step 5: Secure Financing

Building an ADU can cost between $150,000 and $400,000, depending on the size and type. Common financing options include:

  • Home Equity Loan or HELOC: Use the equity in your home to fund the project.
  • Construction Loan: Get a loan specifically for building costs.
  • Cash-Out Refinance: Refinance your mortgage and take out equity for the ADU.
  • Grants and Incentives: San Diego sometimes offers programs to incentivize ADU construction—check with the city for current options.

Step 6: Hire Contractors

Find licensed contractors with ADU experience to bring your project to life. Ask for references, review portfolios, and ensure they’re familiar with San Diego’s ADU regulations.

Step 7: Build Your ADU

Once permits are approved and your contractors are ready, construction can begin. Depending on the complexity of the project, this phase can take several months.

Step 8: Pass Inspections

Throughout the construction process, the city will require inspections to ensure your ADU complies with safety and building codes. Work with your contractor to schedule these inspections at the appropriate stages.

Step 9: Start Using Your ADU

After passing the final inspection, your ADU is ready for use! Whether you rent it out, move in a family member, or use it as a home office, you’ll start enjoying the benefits of your new space.

Why Build an ADU in San Diego?

San Diego’s ADU regulations are designed to make it easier than ever to build. Benefits include:

  • Rental Income: Offset your mortgage or generate passive income.
  • Increased Property Value: Boost the resale value of your home.
  • Family Housing: Provide a space for aging parents, adult children, or other loved ones.
  • Flexible Use: Create a guest house, home office, or studio.

Need Help Building an ADU?

Building an ADU can be an exciting but complex process. If you’re considering adding an ADU to your property and need guidance, I’d love to help. From understanding zoning laws to connecting you with trusted contractors, I can guide you every step of the way.

Feel free to reach out, and let’s turn your ADU vision into reality!

Michelle Reife - (805) 215-4112

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