Buying even a tiny patch of land next to major cities in Poland is out of reach for people with regular salaries, sometimes even garages cost as much as the entire houses used to cost. In villages with reasonable distance by car to the middle sized cities it's quite common to build new houses, those are the only regions where single houses are being built. I know a bunch of people that made it within few years

For me, it'll take a decade or so to even consider buying a land, I'm a apartment dweller for many years to come :p

Also there are some proposals of laws that will allow to build limited sized houses (something like up to 70m2, one storey) without permits, but it's probably possible in municipalities without compehensive land planning, I dunno, it's still complicated

Not exactly what you're asking for, but my husband's family bought 5-10 acres of land and currently have three tiny house cabins placed there. They run on generators. We stay there sometimes. It's not bad, but the lack of plumbing is not my favorite lol