[jyl]

Getting interested in building an accessory dwelling unit (ADU) for rental now and eventually for my dad, when he is too old to live independently.

Portland is encouraging the building of these things, as a way to increase the housing supply.

One possible option is to tear down the small one car detached garage and rebuild it as workshop/studio below and 250 sq ft studio ADU above. I don't park a car there. Another is to convert half of the basement into a 400 sq ft studio unit. Either one would have a separate entrance, a bathroom, and a small kitchenette. Obviously we're taking pretty small spaces, but they'd work for my dad, and even small places will rent in this city now.

What do you think?. Anyone done this?. Any very rough rules of thumb for cost estimation?