In my bird room, I have two large flights as well as several cages. One flight holds the cockatiels, Bourkes and doves. The other houses the majority of my finches. Wide cages (mainly 30X18X18) in the room are used as needed.
When you’re selecting a cage, please keep in mind that your bird will spend many hours in it and be generous. Take into account the type of bird and their habits and needs when choosing a cage.
Finches love to fly. The width of the cage is more important than the height. If you buy a tall cage, the finches will sit in the top portion of it and the middle and lower sections will rarely be used. If you buy a wide cage, the finches will fly across it and the whole cage will be used.