Concrete is pretty cheap. Lumber for framing is cheap. However, sheathing is not super cheap, but not that expensive. Siding though is not cheap even vinyl whic

Concrete is pretty cheap. Lumber for framing is cheap. However, sheathing is not super cheap, but not that expensive. Siding though is not cheap even vinyl which I am not a fan of is not exactly cheap either. So not needing sheathing or siding for the exterior of the wall probably make it cheaper. So it probably would be somewhat cheaper than a conventionally framed wall. I don't know how much, but where I live 1 cubic yard of concrete is $145 dollars.