ADU Cost Breakdown: Should You Build from Scratch or Go Prefab in 2025?
ADU Cost Breakdown: Should You Build from Scratch or Go Prefab in 2025? Key Takeaways San Diego is in an ADU boom. Roughly 1 in 5 newly permitted housing units are ADUs, reflecting strong demand and policy support. Prefab looks cheaper up front—until you add site costs. Factory units from $90–150k (400–600 sq ft) and $120–180k (600–800 sq ft) can climb once you include craning, […]
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