I’m going to assume it’s 11x11ft. If not considering bedroom furniture and purely based on the size, it should be enough for two rabbits to free roam. Not sure about the cats though – personally I think 2 rabbits plus 2/3 cats in a 11x11ft bedroom with furniture is a bit too much for me. But this is personal preference.

You also need to consider the fact that the two bunnies have to go through a proper bonding process in order to live together. This is a process that can potentially take weeks and even months. Until they are bonded, the bunnies have to be kept separated so I’m not sure if there’s enough space for that. Make sure you read up on bonding in the bonding section of this forum to understand the process fully before getting another bun

Getting a second rabbit was one of the best desicions I ever made for my girl bunny. She spent years on her own and I didn’t think she wanted a buddy, but I was so wrong. Rabbits really do love having another bun to talk to and cuddle and spend all hours with. Having said that, bonding rabbits takes time and you’ll need a seperate space for the new rabbit until they can safely be together. My two love each other now but at first they did have some fights, and I couldn’t leave them unsupervised together. It took about a month and a half for mine to bond and times can vary.

Bonded rabbits enjoy being close to each other so I don’t think the space would be a problem but also remember that’s twice the poop, twice the fur etc so more cleaning for u.

If u can manage the bonding process and have a seperate area temporarily for the new bun (outside your rabbits current territory) then yes I think go ahead and get another bun