An Accessory Dwelling Unit, or ADU, is a secondary housing unit on a single-family residential lot. They can be detached from the primary dwelling, attached, or built inside or over an existing building (like a garage or shop).
In Humboldt County Code, ADUs are called Secondary Dwelling Units – these are two names for the same thing.
Background & Purpose
The following resources include a summary of California’s 2018 laws making permitting easier, and links to Humboldt County’s ADU Fact Sheet, permit checklists, state standards, and other resources for ADUs.