remodeling · 8 min read

ADU cost in LA: from concept to certificate of occupancy

A real-world breakdown of what it costs to build an ADU in Los Angeles in 2026, including permitting, utilities, and finish levels.

ADU construction in LA exploded after SB 9 and SB 13. Here's what it actually costs from concept through certificate of occupancy.

Detached new-build ADU: $150K – $350K

Includes design, permits, foundation, framing, MEP, and finishes. Cost varies with square footage, finish level, and site conditions.

Faster and cheaper because the shell exists. Still requires permits and code-compliant ceiling height, ventilation, and egress.

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