First, the "building" would be designed to mask-hide the unit only while being aesthetically pleasing on the outside. The sole purpose is to get it in a building to get around what the ever expanding guberment regulations cover. As for insurance companies, I wouldn't be insuring it. I'm guessing I can put up a small shed/garage of around 20X20, that would match the house, for $3,000 not counting a cement pad. But at this point, I may just be better off not burning wood at all. This adding up to a lot of cash going out.