ADU or Casita, what is the difference?

Casitas and ADUs (Accessory Dwelling Units) are similar in that they both refer to secondary, self-contained housing units on a single-family residential property. However, there are some differences:

1. Casitas: Casitas typically refer to small, detached guesthouses or living spaces that are part of the main residence but separate. They can vary in size and often include basic amenities like a bedroom, bathroom, and sometimes a small kitchenette. Casitas are commonly found in Southwestern and Southern US states, including Arizona, and are often used for guests, extended family members, or as rental units.

2. ADUs (Accessory Dwelling Units): ADUs are a broader category and can include casitas, but they encompass a wider range of secondary housing units that can be attached or detached from the main residence. They are designed to be fully functional living spaces and can include living areas, bathrooms, kitchens, and separate entrances. ADUs are generally regulated by local zoning laws and can serve various purposes such as rental income, housing for family members, or accommodating aging parents.

In essence, while a casita is a specific type of ADU, ADUs can include other types of secondary units beyond just casitas. The distinction often lies in the local regulations and the specific design and use of the structure.