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I'm in a 50'x16' (i think on the 16') with 50 amp and onsite fresh water and a dump station. To me there is no good reason to not do 50 amp. The 20' width he's proposing is a nice touch as mine is too narrow to get much work done, but if possible I'd go to at least 55' length and 60' would be ideal. Well insulated is a key as well to me regardless of climate. We're in the the midwest so it's hot as heck all summer and dips down into the single digits in the winter at times. Good insulation has made all the difference as the single digits resulted in a low of 49 this past winter without any additional shop heat. Speaking of shop heat the owner of my units offers people the option to add a mini-split and the tennant pays the full cost of the unit and install. I think it was around $2500. Several of the tenants have added them. I would too if I was going to be in the unit long term.

Done right he'll always have a waiting list.