The only real ( legal) way to live in a house in the woods , is to buy a house that's already in woodland, or , buy a house with a few acres around it , and plant your own woodland, and wait.
You can try to just buy a piece of woodland, then build your cabin and hope for the best , but , you can't make it a proper address ( with post code , services etc) . Some people just build something to live in , and as long as you get on with your neighbours, they probably wouldn't report you to the council , but , as soon as the council do get to hear about you , then you may as well just move.