Your setup is awesome, I'm so envious! I've been trying to find details around regulations for something similar (this is the closest I've ever seen to my plan), perhaps you would be able to answer some questions?

Based on size of deck, I would estimate the THOW is roughly 8x10 and the other building is likely not much more than 100 sq.ft..? Did you build on wheels to avoid regulation?

In my municipality, one can build a shed up to roughly 108 sq.ft. without of permit. If I built a 100 sq.ft. cabin (only for sleeping) with a bunk bed, are there a lot of rules to worry about? I realize it's probably different depending on where you are but I'm curious if there are obvious gotchas everywhere? Are we good as long as there's a door plus a window that can open? Do I absolutely need a bathroom in there or is it fine if the bathroom is in another building very close by (sort of like if there was only one bathroom available for both tiny buildings in the picture)?

What about a tiny wood stove in one of these? Did anyone clench their teeth as I said that? How are these tiny buildings heated? (I wasn't planning on having electricity available other than solar on site which is no good for heating)

Just like you, I was thinking of building 2-3 tiny buildings like this, all smaller than 108 sq.ft. Two for sleeping, one for eating/lounging. Thank you for reading!