Land Use & Zoning

An 'accessory dwelling unit' (ADU) in Washington is:

AA separate housing unit on a property with a primary residence, used as a second unit✓ Correct
BAny detached garage
CA commercial space attached to a residence
DA room rented for vacation stays only

Explanation

An ADU is an additional smaller dwelling unit (attached or detached) on a single-family residential lot. Washington state law encourages ADUs as a way to increase housing density within existing neighborhoods.

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