I read a fantastic book (
http://www.nortoncreekpress.com/success_with_baby_chicks.html) called Success With Baby Chicks. It outlines a brooder that is made of wood, easy to make. A 2 foot by 2 foot box houses about 25 chicks -- HOWEVER... the way the box is made, the chicks can easily move (and often do) inside and outside the box. The box is suspended above the ground on legs and the "walls" only go to about 4 inches above the ground (until you raise it as the chickens grow). Inside the box you put the brooder light and voila, a warm space they can go to or escape from whenever they please. Right now my 11 chicks are in the barn with this brooder, in a stall that is probably ... 10' by 8'? I think I could probably fit my 27 new ones in there easily but they get big FAST.
I start my chicks inside for the first week. Mortality is high in the first week and I like to keep a close eye on them and make sure they stay safe until they are bigger. Right now I have 27 2-3 day olds in a plastic tote I got from
Walmart. In my opinion it is too small for 27, but unfortunately I don't have a choice right now. Since the weather is getting warmer, this batch might be moved outside before the first week is up, and the older ones moved out! They'll be 5 weeks soon and the weather is warm enough that they can go out.
So far I haven't had any die, but I just started and I think I've been pretty lucky. I know its normal to lose a few.
I really like the dog crate idea shown here... very nice. I did the plastic tote (its clear, if that makes any difference) because my fiance was too nervous about the wooden one we made not working. He wanted to keep a closer eye on them so we built my brooder -- the wooden one, and his brooder -- the plastic one he found from a website. I think the website mentioned one could fit 20-30 chicks in these totes at day one and they had multiple of them so they could thin the numbers out per box as they grew. Quite frankly, I don't have the money to be buying / running that many brooders, so mine just get the boot and go outside! Besides they love it out there better-- more room, more neat stuff to explore, etc.
The book I got was like 15 bucks and the brooder didn't cost much to make. It took my fiance and I a few hours. It was a fun project for a sunny day
I completely contribute my luck/success with my chicks thus far to this book, so I'd rather not go spilling all the details about how to make it. Also, I don't think I trust myself to explain it properly... the book goes into a lot of detail with sizes and how many chicks will fit in how much space, etc. Also, it has a lot of good info on how to progress through the brooding period to have happy, healthy chicks