https://luminabuilders.com/detached-vs-attached-adu-cost-in-san-diego
Detached vs Attached ADU Cost in San Diego | Lumina Builders
Apr 21, 2026 - Detached ADUs in San Diego cost between $300,000 and $450,000 or more. Attached ADUs cost between $150,000 to $300,000 depending on size and design.
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