Here is my opinion cut & pasted from your other identical thread.. Might I suggest deleting that one so it dosn't get confusing ? Welcome. I am also having a 30x40 built but I went with a company that delivers and assembles the building. Other guys here can give advice on do it yourself kits but from what I have read it's usually cheaper to figure out what you need and buy the materials seperately. Where you're located makes a difference as well so post your location. Just to give you something to consider I am in Tennessee and I went through National Barn Company. Mine is going to be 30x40x12. They are pretty much nationwide with a few exceptions and mine is costing me $11,600 delivered AND assembled on my slab. That includes a few extras and they offer a discount for veterans.