SUBREDDIT: r/AskReddit
TITLE: How expensive would it be per year to live in one of those 3x3m houses? (link inside)
POST: So, I'm a musician. More notably an electronica musician, which means I don't have to play with other people to make my stuff, and take up relatively a small amount of room. I currently live in a little tiny Japanese apartment that if I remember correctly is ~19 sqm. Ironically, I have plenty of room to spare. 

I keep seeing videos pop up for these really efficient eco homes like  ( ) and (  )

How much do you think it would cost per month/year to live in one of those? What are the rules on where I can put it? would I have to buy some plot of land? or could I just plant it somewhere hidden and not bother people... (I literally don't know anything)
TL;DR: 
I want to live as cheaply as possible, the Tiny homes in the links seem tempting. How much do you think it would cost per year to live in one?