I had mine built a year ago 8x8 raised coop with an 18x28 covered run, all predator proof, four jalousied windows for ventilation and a poop sand box. You can see my pics. I purchased most of the materials and had it built by 2 professional carpenters. It's like Ft. Knox. My girlfriend calls it the Taj Mahal. Then, it costs nearly $6k, but it's once and done and to my design.
I keep reading about people buying chinese coops that fall apart after a few months. Wasted money and effort. Make sure you can stand up inside the coop. Few people mention this or even think about it, but to me, it's imperative. I know now, with the inflation caused by our brilliant new president, that my coop and run would probably cost close to $10k.
I'm so thankful that I had it built last year.