Being non-biodegradable is a pretty important feature for anything that has to interact with the elements. A house constructed out of truly biodegradable materials would be a disaster.
Eves to protect cladding are essential and if you get a lot of wind and sun, very wide eves.
A combo of UV and rain just punishes wood, and oil/varnish doesn’t handle it well.
Paint fares a lot better.
Most plastics are not biodegradable. They don't degrade in any condition. If I buried a fidget spinner and waited 10, 100, or 1,000 years, It'd still likely find most of a fidget spinner when I dug it up.