This summer, I built a 50x50 pole barn type hangar at H19, Bowling Green MO. It was right at 30K complete. The local lumber yard provided the plans/materials, approx 11K, Concrete 3.5K (not including labor), Cool-Air Inc horizontal stacker door, approx 4.5K, Electrical connection from transformer 300 ft. away, 1.8K. I contracted with three young men from the local area that were out of work (union plumbers) with pole barn experience. Total labor bill 8K. This will vary tremendously on your area. I installed the door (one week assembly/hanging) and the electrical inside the building. I also sealed/stained the floor. There were a few misc bills for equipment rental, i.e. a man lift for setting purlins on roof, and a boom truck for setting trusses/lifting steel onto the roof. I found these locally at a good price. The lowest contractor estimate I had was approximately 5K more, not including the door.
I've done a lot of construction over the years, and could have done it myself with friends, but it was more work than I thought, primarily due to size. There were also some techniques in terms of installing the siding, especially on the roof that were helpful.
Just another economical option.
Jerry