ADU

Housing is getting more expensive. In some cases, building an ADU can help. 

ADU is an "accessory dwelling unit." It's a residence added to the lot which already has a bigger primary residence on it, to which it may or may not be attached. Local regulations vary, but there's usually at least a kitchen, bathroom, and sleeping room. 

It could be sold or it could be rented, in either case providing financial help to the primary property owner. It might be attractive to someone looking for a unit more affordable than a single family house on its own lot would be.

Another reason to have an ADU could be to provide housing to a relative or to a visitor. It could be your own work space, or studio, or a guesthouse.

(cont'd tomorrow)