Nice coop, but way too small for 12 birds. Not enough roosting space. As they get older, they are going to want to roost not sleep in the nest boxes. The hens only use them for laying, and they all want to use the same one, anyway. At least my girls are that way. If you are going to put the coop in the garage, and you don't use it for anything else, enclose it for your main coop. Build a lightweight portable run for when they are in the yard. It can be built hoop-style using 2x6's for the base frame and PVC pipe for the hoops. Cover it with poultry net, or hardware cloth, and presto...a portable run for the yard. By enclosing the garage you will provide them plenty of space during winter. Make sure to put in some ventilation to keep odors down, and fresh air circulating. Don't forget the roosts, as well. Good luck, and let us know what you do and how it turns out!
thanks
that coop is supposed to be light and movable, heh! i didn't think they would sleep in the nesting box and knowing they need fewer, we're going to reclaim the first floor... we still have to put threshold in front of them and the 2 roosting bars are going above the hardware cloth/sewage tray. my mom in law just called and she's coming to help build with us on Friday but since this one is almost done, hubby might decide to pull the credit card and buy the supplies to build the second one.
although he realized that he also have to put decking and stairs for the backdoor's deck
we still need to put the lawn tractor, snow blower, BBQ and a few other things in the garage. there's also some lumber and a bunch of old windows stored in there. i wouldn't want to have everything covered in chicken poop. even 1/3 to half the garage would be plenty big for them but hubby is not sold on that idea. i'm still waiting for him to build me a green house too.