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Prefab vs Custom-Built ADU in the Bay Area: Cost, Timeline, and Quality Compared for 2026 ADU

Prefab vs Custom-Built ADU in the Bay Area: Cost, Timeline, and Quality Compared for 2026

Prefab vs custom ADU in the Bay Area — compare 2026 costs ($150K–$450K+), timelines, and quality. Data from 116+ Bay Area projects by Barcci Builders.

May 18, 2026 12 min read min read
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