I have a 18x11 foot shed/barn... it's mostly to store my lawn mower and a few other things in... but when I got my Fast Eddy PG500, I got this idea that I was going to put it in the back of this shed, so I cleared out enough space to put it in. I really should build me another shed just for smoking in... cause I'm so used to smoking in the shed that I really would not want to go without. It's got like 19 square feet of continuous sofit venting as well as a couple large doors that I were concerned about smoke... I keep a good 18" or more from any combustible material, and for the most part I have little to know fear of any problems with fire, since the PG500 is almost impossible to get a grease fire in while cooking in the indirect side...
Anway, I would like to build a shed about half the size of this one I'm using now, that would be dedicated to nothing but my pellet grill(s). Maybe this summer... All I know for sure is when I want to smoke food and it's 10F or colder outside... I am grateful to have a place where the wind doens't blow directly across my cooking area..