Shane, there is really no "standard" size, but 20X20 is the minimum for most people to consider it a 2 car garage, and I wouldn't do less than 22X22 myself. Keep in mind square footage; 22X22 is 20% larger than 20X20.
For concrete, I'm likely getting the guy who did my neighbour's pad. I say likely because he seems a little shifty, but I really liked the work he did for my neighbour as a sub-contactor, and his price is reasonable.
Permit price- the garage permit will likely be around $150, and then another $60 for the electrical.
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