I had one build in Au Gres a couple years ago. A couple things I did that I really like are light pannels in the top 2' of the walls, although I really only needed it on the south side. Don't even need lights during the day time. If you don't plan to work in there, skip the concrete and go with crushed stone, which is what I did. Mine is just a big storage shed, so concrete was not needed and saved us thousands. If you store a boat in there, like I do, concrete would puddle up water that drips off boats, which is a pain anyway. I absolutely love the 12X12, electric, overhead door since I use my barn like a garage for my truck. When I did the electric, I put in a couple motion activated lights and they are awesome. The main lighting was those LED ones that plug together from Home Depot, which only took me a couple hours to install 10 of them and really light up the place. I built shelving along three of the walls and that really allows me to store tons of stuff and quickly find it when needed. I had two steel entry doors installed, but only needed one, so wasted money there. Make sure the grade for the barn is high enough so no water enters during wet weather. I'm glad I spent the extra money on that as I seen barns before with water pooled up in them after big rains.