It's not really a matter of space. The only bird I ever purchased as an adult was quarantined in a large dog crate in the basement. He probably thought he was in heaven after the way he'd been kept previously. I will never buy another one, period, ever. It was too stressful, watching for symptoms for the five weeks, but I would absolutely never buy a bird and add it without quarantine, risking my entire flock in the process. Even quarantine isn't perfect, but it's the least we can do to try to keep disease out of the flock. Have seen too much heartache from ignoring quarantine protocols here on BYC.