Built a 40 x 60 with 16 foot ceiling, been up for 2 years. lumber was 3000. trusses were 3500. Metal, walls and roof 10000, concrete 10000, 12 x 14 overhead was 1700 and insultation in total was about 5000 but i did alittle outside the box. I did all the labour except for concrete finishing and installing the door.
After that its all about how far you go on the electrical and finishing. All i can say is whatever you think you can get away with for space, triple it and break ground. good luck on your build.
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