Very sporty price. May I ask what work was done by yourself?
In Bavaria, for this size, at least 60 grand would be gone (turnkey)
shell construction (foundation, floor slab, masonry and lintel) roof, electrics, insulation.
I had windows and gate done, also interior plaster and heating.
Oh, and I laid industrial flooring in the garage on an epoxy resin basis. You can clean it really well. But the material also cost almost 2000.