Hi there

You can get waterproof laminate for wet areas, but it does get pretty pricey. There is also the concern that bunn may be able to get his teeth between the planks and pull them up if determined. Whoever heard of carpet in a bathroom anyway

You could use lino, a lot of people use it in their rabbit’s condo cages, including myself. I’m not sure whether they’d be able to dig through it because the claws slip more on it rather than the way they pull at carpet and there’s no edges or joins to grip. You just have to be sure that all the edges are secure. Otherwise, tiles, which is a lot of work. I’m not sure what to suggest otherwise.

Some other options for dealing with his digging at that spot, include pulling the cage forward slightly to let him explore behind there. If he’s let behind there and gets to find out that there’s nothing there, in most cases it becomes much less interesting and they lose the desire to go back there (not always). Another method to put him off is one that I think Q8 tried (correct me if I’m wrong, my memory is hazy on this) where they put their mobile phone on a loud setting, put it behind the furniture that bunny was determined to get behind, and when bunny tried to get back there, dialed the phone so that it rang loudly and scared their bunny away.

Yeah, I would suggest Lino too, or tile which is easily cleanable and keeps the bun cool. Perhaps leaving them a rolled towel in case they want something squishy to lean on would be a nice compromise. I think in a smallish space if they’ve got wood to chew, they’re going to chew, especially if they’re prepubescent or of a sexually mature/un-neutered age.