Cost · 8 min read
What a modular ADU actually costs in the Bay Area in 2026
The factory package, the foundation, the trenching and the four line items that decide whether your project lands at $315,000 or $470,000.
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Cost, code and craft, written from the projects we are actually building. Town guides cover setbacks, review timelines and what each planning department will and will not approve.
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Portola Valley: fault zones, fire hardening and grading limits
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