Just stay away from the odd sizes as the cost goes up. I built a 30x70 with 12' wall.with a 15ft. leanto on the one end to put my tractor and some equipment under. It seems the price is govern but the roof truse size.
Had 4 windows install and one walk through door. The 2 garage doors are 10' and 15'.
The pole barn builder is a neighbor and he builds over 50 barns per year. He only puts on shingle roof over plywood. If the customer wants a metal roof it also has to be installed over plywood. If not he won't build a barn for you. With the plywood sub roof it won't sweat and rain indoors. Also he said a metal will leak and just a matter of when. With a plywood sub roof and shingles he has no roof leak call backs. I agree.
With 12' walls after pouring 5" concrete floor you'll end up with 11.5' finished walls.
I put my man cave on the end where the leanto and walk through door are.
Just be sure to have concrete floor put in because if you don't you probably never will move the stuff out to pour concrete.
If you plan on putting in a loft for 2nd story storage have sissor jack roof truse used instead of regular truse. I didn't and now I have a area of 15x30 with less than 3' of floor between the floor and roof truse. I'm contacting a building contractor friend of mine and see if I can rebuild the truse and remove the center section.
I did install sissor jack truse over the small garage door so I could install a car lift. As luck would have it my son installed a car lift at his warehouse so now I don't have to.
Other good news today is my son informed me he is picking up the expense of all the labor and buried cable. I guess he's starting to remember I used to chance his dirty diapers when he as young. LOL
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