Maya and Harrison compare a prefab ADU and a custom-built ADU in Los Angeles: what each one costs, the site work both need, how permits and inspections work, and how to compare bids for your lot.

• A prefab ADU is not automatically cheaper, because both options pay for the foundation, utility hookups, site work and permits.
• Cala Builders' 2026 site-built ranges start at $140,000 to $280,000 for a detached ADU, including design, permits and construction.
• A factory-built unit still needs a Los Angeles permit; the city controls zoning and setbacks and inspects the foundation and utilities (HCD Factory-Built Housing Handbook).
• The city must act on a complete ADU application within 60 days (HCD ADU Handbook, March 2026).
• Compare full project totals for the same lot, size and finish level, not the unit price alone.

Cala Builders, CSLB License #1156496. Read the full article at calabuilders.com.

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