ADU Types

ADUs come in many different shapes and sizes. Follow the information and links below to learn more about a variety of ADU types.

ADU Types

ADUs come in many different shapes and sizes. Follow the information and links below to learn more about a variety of ADU types.

Detached (DADU)

Stand-alone home on the same lot as a larger, primary dwelling. Examples include backyard bungalows and converted outbuildings.

Attached

Connects to an existing house, typically through the construction of an addition along the home’s side or rear. Such units can have a separate or shared entrance.

Interior (Upper Level)

Connects to the existing home in the upper level. This could involve an addition or rehab of a current space.

Interior (Lower Level)

Basement area that could be converted into a livable space per local regulations.

Above Garage

Makes use of an attached or detached garage by adding a second story ADU above a garage or building a new structure for both people and cars.

Garage Conversion

Makes use of an attached or detached garage by converting the space into a residence.

ADUs

Download Our FREE Guide

AARP’s Accessory Dwelling Units: A Step by Step Guide to Design and Development is an ADU Design Catalog for homeowners, builders and local stakeholders who are interested in learning more about ADUs and expanding housing options within the community.

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Whether you’re interested in building your own ADU or you want to join AARP Illinois in bringing the ADU option to more communities across Illinois, we’d love to hear from you.
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