Some bunnies are just not as curious at others. If he is food motivated, you can leave him a trail of food to other areas. You can also try picking him up and setting him down in another area so he knows it’s ok to be in another area; I did this with one of my buns which helped but he still hangs out mostly in one area while the other one wanders all over.

Does he dislike the flooring in the unexplored area?

That’s very possible. My bunny likes the wall to wall carpet in our new(ish) home that runs through 2 rooms and a hallway. But she Hates tile. She never, ever sets foot on it. And I bought her a low pile area rug on the tile that abuts the carpet – she won’t walk on that either. However, she would walk on her baby blanket that I set on top of the area rug on top of the tile (that lived in the house that Jack built).

Bunnies + flooring = fickle. You just never know.

Also, a 6 year old is pretty mature, and adults tend to like their habits, comfort zones, and don’t explore as much as when they were young. I think once he established a territory where he felt safe and happy, he got content to remain in that area. Unless he’s getting fat from lack of exercise, I’d let him be where he likes it. You can try throwing a soft blanket across the wood floor though, in case he’s like my Samantha and tippy toes onto it.

Mine really don’t like wood floors or tile, so that could be the issue. Otto treats it like lava and almost never crosses it. Hannah will cross it to get where she wants to go, but she doesn’t explore on wood floors – she’s still never found the stairs and doesn’t go in the kitchen, so they only use about 1/3 of the area that’s open to them. I think that’s pretty normal! They seem to make up their own rules and then follow them 🙂