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Accessory Dwelling Unit

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An Accessory Dwelling Unit (ADU), sometimes called an "in-law apartment" or "carriage house", is typically a separate housing unit within, or on the same lot as, a single family home. ADUs have entries and amenities that are separate. In the City of Arvada, there are multiple types of ADUs.

Types of Accessory Dwelling Units

Type A

An Accessory Dwelling Unit which is detached from the principal dwelling.  It is considered lockable and rentable.

Type C

An Accessory Dwelling Unit with the following characteristics:

  • Located inside a single family dwelling, or
  • Attached to a single family dwelling.
  • Whose occupants and the occupants of the principal dwelling live together as a single household unit and which is neither rented nor locked off from the principal dwelling.

A Type C Accessory Dwelling Unit and principal dwelling shall be considered part of one dwelling unit under the building code.  The HVAC system may be shared and fire separation requirements are treated differently.

Type B

An Accessory Dwelling Unit with the following characteristics:

  • Located inside a single family dwelling, or
  • Attached to a single family dwelling
  • Whose occupants and the occupants of the principal dwelling do not live together as a single household unit and which is rented.
  • Typically have a separate access from the principal dwelling.
  • Which is locked off from the principal dwelling.

Both Type A and B Accessory Dwelling Units are considered a separate dwelling unit under the building code.  Fire separations nd a separate HVAC system are required.

Examples

Type B or C ADU located inside an existing dwelling

Type A dwelling unit with alley access graphicType A Dwelling Unit with access off of the street graphic

 

 

Type B or C dwelling unit addition over garage graphic

 

Contact Information 

  •  Telephone Number:
    720-898-7435