- an apartment over the garage
- a tiny house (on a foundation) in the backyard
a basement apartment
Though accessory dwellings are an old idea (think of the old alley apartments in DC, or the carriage houses you see in fine old Seattle homes), they fell out of favor in the middle of the 20th century. Now, however, they’re coming back, and they have lots of names. Planners call them ADUs (Accessory Dwelling Units), but they’re also known as granny flats, in-law units, laneway houses, secondary dwelling units, and a hundred other names. ADUs can be tiny houses, but tiny houses aren’t always ADUs.