@solderpunk I will keep it as a "fritidshus" (think vacation home) because otherwise I would probably have to connect it to municipal water and sewage, which is likely to cost at least 5 times the house.

And even if I don't classify it as my home - and I would stay in it as a fritidshus only - I am required by local regulations to have a waste disposal contract. So I can't just (legally) dig a hole in the ground and poop in it as a costless solution.