I put up a 30X36 stick built and have ~18K in it with concrete, siding, windows and all \but I added a lot to the original plans/drawings, if i'd have "stuck" to the plans and done it 100% myself and not had to pay anyone to do anything for me I'd have been closer to ~12,500 I'd guess. I changed from the plans' 4/12 to a 6/12 roof and added 2X10 ceiling joists and put in a doubled up 12" LVL down the center to support the ceiling, and I made the walls 2' taller than the plans called for. the plans I bought were for just an "open" building, no ceiling/attic. I paid out ~$3500 for "assistance" these guys helped me with the walls, and did all the ceiling joists, rafters and roofing for me.
I did ALL the vinyl siding, soffit and fascia. I also did ALL of my own electrical. from sub panel to 2 separate 220V circuits to digging and tying the sub panel into the house wiring.
the amount I have wrapped up in it to date, also includes a gutter crew that came out and made my seamless gutters on site.
I say all this as a long way of asking "what are you getting for the prices quoted? Just a bare building? or is that wired, sheated insulated and all? Concrete or gravel? There are too many variables that other post-ers have not specified that will make a HUGE difference in price. 100% done by yourself? 100% contracted? or some sort of mix like mine was? How many and what kind of overhead doors? How many man-doors and windows?