Tag: 400 sq ft adu

All the articles with the tag "400 sq ft adu".

• 400 sq ft ADU Cost in California: Why Smaller Is Not Cheaper (2026)

  Updated:5 Sep, 2026

  We modeled a 400 sq ft detached ADU in Los Angeles County. Total: $215,000 — or $537 per square foot. Here is every phase, why fixed costs dominate, and when 400 still makes sense.