My new(three years old) 8 x 8 coop has a raised wooden floor, which I like because rats and things can't dig tunnels under it. I have 14 hens. I built this coop (with lots of help from our daughter and son-in-law) and it is working great. I put in features I like such as a dropping pit-type roost with a hatch in the back for easy manure removal, and a 320 square foot run made of turkey wire and with a turkey wire top (I chose turkey wire because it's a lot more durable than chicken wire but easier to work with than hardware cloth. Although the children helped build the coop, I was on my own with the run and hardware cloth is too hard to work with without help, not to mention expensive!). If I had the money, the only thing I would have done differently or added would have been a facility to start new chicks when these hens get old and are no longer productive (they are going on their 3rd year). As it now stands, I'd pretty much have to get rid of the old hens, thoroughly clean everything and start new chicks from scratch in the coop. I have two blue Cochin hens whom I would not want to get rid of, so maybe I'll build a small separate coop and run for them when I start my new chicks. And since Cochins are so gentle, they should readily reintegrate. So I guess I'm reiterating a lot of other folks' advice...built it bigger (if you can afford to), but if you can't, don't let "chicken math" get the best of you. A few healthy happy hens with as much space as possible are more productive. I'd like to have ducks again some day, but I'd want a separate pen for them.