Costs & budgets
How much does an ADU cost in Cupertino?
Cupertino ADUs cost $110K–$195K for a garage conversion and $275K–$485K for a detached new build in 2026 — typical of the Bay Area market. Lot conditions, utility upgrades, and finish tier are the biggest swing factors.
Cupertino construction labor and permit fees track the broader Bay Area market within ±10%. Hillside parcels, historic overlays, and corner lots can each add 8–15% to the base number.
Two-thirds of Cupertino ADU budgets land within ±15% of the midpoint when scope is locked early. Most cost surprises come from late selection changes or undiscovered site conditions.
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Related questions
- • How long does it take to build an ADU in Cupertino?
- • Do I need a permit for an ADU in Cupertino?
- • What's the cheapest ADU type in Cupertino?
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