I would love to be able to let my birds free roam around the house, but in my opinion, it is just not safe. There are too many things that could go wrong. Even if you try to completely "bird proof" any area, in my experience, birds will still usually find something to get into anyway. Plus, the chance of them flying out a door while you go out to do something as simple as check the mail etc. is scary. And what if a ceiling fan got left on by a visitor, there's just way too many variables of what could happen. I would also be worried about them chewing on the walls, appliances, couches etc. I keep my birds in one large room and they have a lot of supervised out of cage time, but I dont have to be as worried about them hurting themselves, or getting into things, since it's a smaller space that I can more easily "bird proof" and I'm not having to try and make the whole house safe. Also I dont think it's a good idea for birds not to have their cage. All of my birds think of their cage as a safe space, and although they love to come out of their cages to fly and play, they spend a surprising amount of time going back in their cages to play and just sit for a little bit even when their cage doors are wide open. I know you have budgies and a GCC, that would make me very nervous to have the GCC out with the budgies; the beak size difference is pretty large. I have 2 GCC's and I will never let them out with my budgies and cockatiel, there's just too much of a chance of the large beak of my GCC's doing astronomical damage to my little birds, even if they did get along.