I'm going to be building an approximate 24' x 40' 3-car garage in the spring. Currently, I am trying to determine if I should build it conventionally with a footer/block foundation (frost-line 21" here), or doing it "pole-barn style". What i'd like is to make this garage with a gambrel (barn-like) roof, so I can possibly put a 2nd floor in it, for storage, etc.

I am familiar with how to build a conventional garage using a footer and block foundation, but am completely unfamiliar with polebuilding construction.

What are the disadvantages/advantages of a pole-style versus conventional? I assume a pole-style is cheaper, foremost. Will it last as long and be as stable? Can I have the 2nd story? Do they look the same on the outside?

Thanks,

Tom