I also like the area because the homes there are zoned to allow for new construction of accessory dwelling units (ADUs).

In many areas, you will want to get your stationary tiny home built and permitted as an ADU (accessory dwelling unit). 2.

I'm looking at owner occupying, so one option I'm looking into is an Accessory Dwelling, and I'm waiting to hear back from zoning on if this would solve my problem. 

@Chris Seveney  they are quite popular in PDX we call them ADU  accessory dwelling units and usually are above the garage...

Can I simply add an ADU (accessory dwelling unit or granny flat)?

Lots of accessories to really make the kitchen pop.

My experience, however, told me taught me there are specific rules for separate dwellings that may define it as another unit or just an accessory unit.

I gather that an accessory building less than 120 sqft is exempt from building permit, but must still be constructed in accordance with the building code including foundation and slope setbacks and other hillside construction requirements.

Even if you try to affix the home then it can be deemed an accessory building so point is if city doesn't want it because most laws don't address it directly they will say it is not allowed because of some law.

Our new home is in New Hampshire and has an "accessory dwelling unit" / in law suite, which we plan on renting, especially since NH law is making it easier to rent accessory dwelling units (RSA 674:71 through RSA 674:73).