This is my first chicken coop that I have built, and after looking at lots of coop designs here and all over the web, I came up with this design. Without an actual cut plan, or drawings most of it was in my head, and the final product would have been a little easier to build, but I think it turned out nice. It is a tractor design, and although easy to move, it is heavy, again better plans than just what was in my head would have solved that.
Each nesting box is roughly 12"x12"x12" minus the slope of the roof and a couple inches I added on the sides just to give it a little extra room. The ladder leads up to the nesting boxes, and although you can't see it in the picture above, there are two roosting 2"x2" poles going across the entire coop.
Here is the rough finished coop before I painted and installed the roof and chicken wire. I added two caster wheels to the front to help in navigation but except for on the driveway they dont work very well in my sandy yard. The four tires in the back work great and with two people, moving it is a breeze.
Of course you cant have a barn on wheels unless it is painted red! The finished roof has two window sill locks and a handle to open it up. The first top section in the front has a hinged access to be able to feed and raise/lower the chicken ladder. I may add other access panels on the bottom sections if it would be more convenient to access the bottom of the coop.