What is an Accessory Dwelling Unit (ADU) – and Tips for Building One 

Accessory dwelling units or ADUs — those separate living units tucked inside a single family home or sharing land with one — are having a rock star moment. 

Dozens of cities and counties, and at least nine states, including California, have changed or adopted laws that make it easier and more attractive for homeowners to build ADUs. 

For homeowners, ADUs can be a source of rental income or serve as living quarters for adult children or extended family, a work-at-home space, a place to escape to or run a home-based business.