FAQs

The main difference between an internal, attached and detached accessory dwelling unit (ADU) lies in their location relative to the primary residence.  

Internal ADU: This type of unit is a form of an attached ADU that is within the existing primary dwelling (i.e. the main house) and is typically located in the basement or attic. 

Attached ADU: This type of unit is physically connected to the main house, typically sharing a wall, roof or foundation. It can be an extension of the existing structure or converted space, such as a basement, garage or attic. Because it's attached, it often shares utilities with the main house. 

Detached ADU: This unit is a completely separate structure from the main home. It is typically located in the backyard or on a separate portion of the property, offering more privacy and independence from the primary residence. Detached ADUs are often built as stand-alone buildings and might have their own utilities.