we built a barn 3 years ago..here are some things to think about...ground plans as you have been playing with are a good starting point..but, every good "thing" you think you want adds cost. I recommend figuring out your "must haves" to start then build a plan around that. Example, insulated ceiling sounded frivolous to me at first but you know what thank goodness we put it in..it keeps it significantly cooler on hot days and my horses water buckets have never frozen through..only a thin layer of ice when it goes down to zero. An isle way large enough to drive a lger pickup down...the vet, farrier, hay guy, your own truck, tractor...its a huge detail. as far as leveling, you need some sort of base we used many tons of chat and my property is very level already but not by laser! we built a smallish barn with 7 stalls, a "tack room" that turned in to a feed room (the trailer is our tack room) just the building & stalls were 23K added electricity by a licensed electrician (the last thing you want is an electrical fire in your barn) 3K & ran water to the barn (hoses got really old really fast) 1K hope this helps
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