You know, I am one of those people referred to in some of the pinned topics of people who should not be breeding budgies, but unfortunately am. I am embarrassed to share this information, as I'm sure many of you will be rolling your eyes and branding me more than just a bit silly but......
We had a pet budgie whom we had since he was about 8 weeks old. We recently moved house (4 hours) and although I took what I believed were due precautions (removing any movable items from the cage and covering the cage with towels while in transit in our car) 'Cheeky Boy' did not travel well, and died 3 days after the move. He was about 3yo. When I started to tell my 4yo daughter that Cheeky Boy had gotten very sick, there were lots of tears and so instead of saying he died, I told her I let him go back to his family to get better and that he would fly to a pet shop once he was feeling better.
So a week later, whilst I was at work, my mum took my two girls to a pet shop and told the lady our story. Mum found a bird she thought looked a lot like our Cheeky Boy and pointed him out to the lady, who played along and sold my mum the budgie. So anyway, mum tells me that night, that the new 'Cheeky Boy' had a girlfriend at the pet shop, whom he was kissing. She was hinting that we should purchase her too. So the next day, we went back to the shop and the shop keeper indeed told me that Cheeky Boy II was part of a breeding pair that they had gotten from the man who sells them their baby budgies. Mum, being the soppy sack she is, (and me, giving in) buy the female, and the pet shop lady arms us with a breeding box, nesting material, a budgie book, and more food (with shell grit, some kind of powder made for hand raising? and minerals etc) and sends us away.
So not knowing what I'm in for, I get home, add the female to the cage (instant reunion & lots of kissing), read the book cover to cover, add the nesting box and nesting material. Had I known then that a breeding pair wont mate if there's no nesting box, I would not have put it in. So I notice all the signs that the pair are broody - Cheeky Boy II is feeding Lady, Lady is in and out of the nesting box, using the nesting material etc.
And then we had the egg incident on Tuesday, and now here we are. I am a familiar bird handler and my husband has had ring necks, sun conures & a galah, so he is quite good with birds, but neither of us has bred one before. I am frantically trying to increase my knowledge without appearing to be a complete idiot who has dived in the deep end.
SO! To answer your question, my birds are in a standard square cage about (I'm not going to measure it right now, as I'm trying not to disturb them) 50cm square, with natural branches for perches, and the nesting box is outside the cage, with the opening poking through one of the doors. They live in my dining room - we don't eat in there, it's an open room, open to the lounge room, so the birds can see the family activity, but not be overly disturbed by it. They can see the TV. I cover the cage at night with 2 towels to keep them warm.
I'll take a picture tomorrow if I get a chance and will post it for you.