Choose the closest project type
The city’s guide separates attached homes, detached homes, conversions and junior units. Describe your existing structure when asking the Permit Center which route applies.
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SUNNYVALE • SANTA CLARA COUNTY
Sunnyvale ADU Services
An addition at the side of the house feels different from a cottage at the back of the lot. Sunnyvale’s ADU guide gives those options a local starting point.
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At a glance
Compare example plans
Sunnyvale’s ADU page links to a pre-approved plans gallery and local cost calculator. Use them to compare design directions and to assemble questions for the designer.
Check the submission sequence
The city explains which proposals require planning review before the building permit. Ask staff to confirm the path for your proposed scope and parcel.