I posted before about possible wanting to keep chickens (illegally) in my backyard. I measured the space but I think a picture would serve me better here. This is how much space I have to work with. You can see how much "grass area" I have and how much concrete there is. The fence is roughly 6' high. Here is another angle, and in this image you can see the dog crate I was hoping to convert into a coop. Thats gives you an idea of the size. I was planning on building a "box" around it with windows and such and fix it up kind of like the eglu that is available online. Then attach wire fencing to it to make a run.