What Types of ADUs Are There?

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ADUs or Accessory Dwelling Units generally fall into these three major categories: interior, attached or detached.


Interior ADUs—Located in the primary dwelling, it is built from existing, converted space, usually in the attic or basement.

Detached ADUs—A separate, exterior, stand-alone structure on the main home’s property, like a cottage or detached garage.

Attached ADU—These are built as an addition to the primary home structure.

Explore the various ADU options and what you might want to build.

What Does an ADU Cost?

ADUs can vary widely in cost, depending on a host of factors:

  • Is it an interior ADU, detached or attached?
  • How big is it and where is it located?
  • What finishes and amenities do you want to add?


Many ADUs are really tiny houses that contain most of the same elements as a regular home, just constructed into a space-saving design on a smaller footprint. A general, ballpark estimate for a 200 square foot interior ADU is about $150,000.  Again, this budget number can vary widely depending on the type, design, size, and other aspects of the ADU. The best way to get a ballpark estimate is to talk with your design/build firm about what your specific needs are.

What is an ADU?

ADU regulations

How do I learn more about ADUs?

How do I sign up for an upcoming ADU seminar?

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