ADU & Granny Flat Construction in Cupertino
An Accessory Dwelling Unit (ADU) adds a permitted, self-contained living space for rental income, family, or a home office. We design, permit, and build detached, attached, and garage-conversion ADUs in Cupertino to current California ADU law and City of Cupertino requirements, from foundation through final finishes.
What's Included
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Our Process
Feasibility & Design
We confirm what your lot allows under state ADU law and Cupertino rules, then design the unit.
Permitting
Plans are engineered and submitted to the City of Cupertino for ADU permits.
Construction
Foundation, framing, systems, and finishes are built to code.
Final Inspection
We complete inspections and hand over a move-in-ready, permitted unit.
Frequently Asked Questions
How much does an ADU cost to build in Cupertino?
ADUs in Cupertino typically run $150,000-$400,000 depending on whether it is a garage conversion or new detached build, the square footage, and finishes. Garage conversions are usually the most affordable path.
How long does it take to build an ADU?
Most ADUs take 5-9 months including design, permitting, and construction. Garage-conversion ADUs are generally faster than new detached builds.
Free ADU & Granny Flat Construction Estimate
Serving Cupertino and the West Valley
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