Second Story Addition Cost in the Bay Area
Second story addition cost in San Jose and the Bay Area: $200,000-$400,000 for an 800 sq ft addition with mid-range finishes. Per-city pricing from a licensed architect-GC.
ADU Cost in the Bay Area: What to Budget in 2026
Building an ADU (Accessory Dwelling Unit) in the Bay Area is one of the smartest investments you can make right now. California leads the nation in ADU construction: the California Department of Housing and Community Development (HCD) reports that ADU permits statewide more than tripled between 2018 and 2023, driven by laws like AB 68, SB 13, and AB 2221 that streamlined approvals. But smart doesn't mean cheap. Here's an honest breakdown of what ADUs actually cost in 2026, based on what we're bu
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