Tbh that sounds tiny. It needs to be big enough that bun can run and jump.

Each of those wire panels are a little less than 15″ across, so if you used 2 panels for the width and 4 panels for the length, that would come out to around 29″ x 59″. That would be a pretty good sized pen, almost 5 feet long, certainly better than any cages sold for rabbits. If it still didn’t seem large enough after putting it together, you could always add extra panels to the width or length. It is important that your rabbit would have adequate out of cage time daily. The size of the rabbit comes into play too. Larger breeds will of course need more room in order to be able to hop around.

Does the place you are adopting the rabbit from not have any specific requirements for their habitat regarding the size. I know a few places here in the uk want quite a sizeable living area and run. They want them to go to homes where the space is as big as possible. Although I understand some places may just be happy to find them homes

I’m buying a two-level habitat that has two 43″ x 29″ x 15.5″ levels each, a total of about 15 square feet, to be coupled with a nice roomy exercise/play pen. I showed the pictures to Panda and Fernando’s foster mom yesterday afternoon during my get-acquainted session with the buns (which turned out to be the adoption session! ) and she agrees that it’ll be big enough for them; they’re – I think based on how they look and comparing them with pictures that I’ve found in books and the Net – Polish or Polish-mix bunnies with about 4 pounds each adult weight. So I think you’ll want to look at the adult size and weight of the rabbits you’re planning to adopt and multiply that by a factor of 4, which is the general rule of thumb; they need to be able to stretch out full-length, hop at least a couple of times and be able to sit up/periscope when something catches their attention.