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32 years of experience

An accessory dwelling unit (ADU) is a legal and regulatory term for a secondary house or apartment that shares the building lot of a larger, primary house.


  • An accessory dwelling unit, or ADU, is an additional residential building that occupies the same lot as a primary residence.

  • Examples of an ADU could be a guest house or a detached garage with a rented apartment above.

  • The establishment and use of an ADU will fall under different zoning rules and regulations depending on where you live.


The accessory dwelling unit, or ADU, is also known as an in-law or mother-in-law unit, secondary dwelling unit, granny flat or carriage house. An ADU has its own kitchen, living area, and a separate entrance. An ADU may be attached to a house or garage, or it can also be built as a stand-alone unit, but it generally will make use of the water and energy connections of the primary house.


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