12x10, if I had seen this a few months ago the ruling was 12 x 20. A day late and a dollar short, should have here yesterday the waves where great. got to love it. But a 12x 10 would be nice too. I'm in Lewis county out side of city limits, so it may be different for you. Of course electrical permits are required. I need one for a shop, and one for my son and he gladly take it too.