I haven't researched the cost of building a run/coop out of wood, but the supply lists I see here in BYC look long and expensive. And as a 77-year-old woman, I'd never try to build one. I already have a small coop with an attached run that would fit really well in one of these 9x9 Walk in runs. Plus, I could put it together myself. My four 9-month-old pullets free-range, so this kind of set-up would be perfect when the temps in our high desert climate are super hot, or when the monsoons come and we have big winds and rain. Perfect for any climate, it seems! Thanks for this tip, I just might purchase one in the spring!