Active job

Build a new house

I am just wanting a rough idea of the cost to build a new house ( about 200 sqm, single level, I am thinking about A1 Kitset type of house). We have been renting for over 2 years as new exiting houses are too expensive and old one is too cold and damp. Some sections in my mind but would like to know more about the cost of building before make the move. same question as the one from Hutt valley. ideally contract the whole job to one person or company.