Oakland, California
Most Oakland residential lots qualify under California state ADU law, and the flats' deep lots suit detached new construction as well as garage conversions.
$190K–$270K
All-in build cost
construction, design, permits & fees
$2,400–$2,900
Monthly rent
one-bed comps nearby
2–4 mo
Permit timeline
typical city review window
up to 1,200 sq ft
Typical max size
detached new construction
Estimates from regional cost and rental data — not a quote or a permit decision.
For Oakland ADU builders
Every homeowner searching "ADU cost in Oakland" ends up on a page like this. Our early-access widget will give them the answer for their exact address on your site — and send you the lead. Founding builders get it first.
FAQ
Most detached ADU projects in Oakland land between $190,000 and $270,000 all-in — construction, design, permits and fees. Garage conversions come in lower; high-end finishes and difficult lots push higher. These are estimates from regional cost data, not a quote.
Local comps put a new one-bedroom ADU in Oakland at roughly $2,400–$2,900 per month, depending on neighborhood, size and finish.
Permit review in Oakland typically runs 2–4 months, plus design time before you submit. California's 60-day review clock applies to each complete submission — correction rounds are what stretch the calendar in practice.
Most Oakland residential lots qualify under California state ADU law, and the flats' deep lots suit detached new construction as well as garage conversions. The fastest way to find out for a specific address is a feasibility check against the city's zoning data — that's exactly what our early-access widget will do on builders' websites.