FAQ ADU

Common Questions

ADU FAQs for San Diego Homeowners

Have a question not answered here? Book a free consultation — we’re happy to walk through your specific property.

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  How much does it cost to build an ADU in San Diego?
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  ADU costs in San Diego typically range from $150,000 to $350,000+ depending on type, size, and site conditions. Garage conversions are generally the most affordable ($80k–$150k), while new detached ADUs run $180k–$350k+. We provide detailed cost estimates during your free consultation — no guesswork.
• 
  How long does the ADU permitting process take?
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  Permitting in San Diego County typically takes 3–6 months, though timelines vary by city and project complexity. We handle all design, plans, and permit submissions on your behalf to keep things moving as efficiently as possible.
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  Can I rent out my ADU immediately after it’s built?
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  Yes — once your ADU receives its final inspection and Certificate of Occupancy, you can rent it out right away. Many of our clients generate $1,500–$3,000/month in rental income, often covering most or all of their mortgage payment.
• 
  What types of ADUs can be built on my property?
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  The most common types are:

  • Detached ADU — a brand-new separate structure on your lot
  • Garage conversion — transforming an existing garage into livable space
  • Junior ADU (JADU) — a unit created within your primary home
  • Over-garage ADU — adding a unit above an existing garage

  Which type is right for you depends on your lot size, existing structures, and goals.

• 
  Do I need to move out during ADU construction?
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  In most cases, no. For detached ADUs and garage conversions, you can typically remain in your home throughout construction. For projects that involve the main living space, we’ll discuss any temporary arrangements during the planning phase — well before work begins.
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  Will adding an ADU increase my property taxes?
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  Yes, but only on the assessed value of the new addition — your existing home’s value is not reassessed under Prop 13. The increase is typically modest and far outweighed by the rental income and property value an ADU adds.
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  Does iL Total Design handle everything — design through construction?
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  Yes. We offer a full-service process: feasibility assessment, architectural design, permit drawings and submissions, and construction management with trusted local contractors. One point of contact from first call to final walkthrough — no juggling multiple vendors.