Educational Content: This article is for informational purposes only and does not constitute medical advice. Always consult a healthcare provider for diagnosis and treatment.

Definition of Accessory dwelling unit

Medically reviewed by Dr. Otari Nergadze, Neurosurgeon | Updated: January 2026

Accessory dwelling unit: (ADU) A separate housing arrangement within a single-family home. The ADU is defined by Medicare as a complete living unit and includes a private kitchen and bath.