Accessory Dwelling Units in San Diego

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An Accessory Dwelling Unit (ADU) is a self-contained living space built on the same property as an existing home. It can be a detached unit, a garage conversion, an attached addition, or an interior conversion such as a basement or portion of the main home. ADUs are a great way to add living space for family, generate rental income, or increase your property’s value.

The cost to build an ADU in San Diego can vary, but typically ranges from $150,000 to $400,000, depending on size, design, materials, and site conditions.

• Garage Conversions: $120,000–$180,000
• Attached ADUs: $180,000–$300,000
• Detached ADUs: $250,000–$400,000+
  LZ Construction Design/Build Remodeling can provide estimates based on your property, design preferences, and budget goals.

Several factors can influence the total cost:

• Size and layout of the unit
• Site accessibility and existing utility connections
• Foundation type (new slab vs. conversion)
• Finishes and materials chosen
• Permit fees and local regulations
• Structural or grading work required

The entire process typically takes 6–12 months from start to finish:

1. Design & Planning: 1–3 months
2. Permitting: 2–4 months (varies by city)
3. Construction: 4–7 months

LZ Construction Design/Build Remodeling manages every phase to keep your project on schedule.

Yes. All ADUs require building permits from the City of San Diego or your local jurisdiction. These include structural, electrical, plumbing, and zoning reviews.
Our team handles all permit applications and submissions for you to streamline the process.

In most residential zones, detached ADUs can be up to 1,200 square feet, while attached ADUs are limited to 50% of the existing home’s living area or 1,200 square feet, whichever is less.
San Diego has relaxed many zoning restrictions, making it easier than ever to add an ADU to your property.

Most single-family and multi-family lots in San Diego qualify for at least one ADU, and sometimes multiple.
We offer free consultations to confirm feasibility and explain what options are available for your specific lot.

Yes. In San Diego, ADUs can be rented out for long-term housing (30+ days). They typically cannot be used for short-term rentals like Airbnb, per city regulations. Renting your ADU can provide consistent income and help offset your mortgage.

You can choose from several ADU types:

• Detached ADU: A standalone structure separate from your home
• Attached ADU: Built as an addition to your main residence
• Garage Conversion: Transforms an existing garage into living space
• Junior ADU (JADU): A smaller unit within or attached to the main home (up to 500 sq. ft.) 

LZ Construction Design/Build Remodeling offers turnkey ADU solutions, including:

• Property evaluation
• Design and drafting services
• Permitting and city coordination
• Construction and project management
• Interior finishes and final inspections

Yes. Many homeowners use home equity loans, construction loans, or ADU-specific financing programs. We can connect you with local lenders who specialize in ADU projects.

Absolutely. If you already have architectural or engineered ADU plans, LZ Construction Design/Build Remodeling will gladly provide a construction estimate based on your existing drawings. We’ll review your plans, verify they meet current San Diego building codes, and give you a competitive estimate for the construction phase.

We provide full-service ADU design and construction, ensuring your project is efficient, compliant, and beautifully crafted. Our San Diego-based team understands local codes, permit processes, and neighborhood styles, making us the trusted choice for homeowners across the county.