Hi It clearly depends on the type and quality of Villa being built. We are building to a very high specification so the costs involved are obviously higher. The cost of building on the Gili's is obviously higher than building on the mainland as there are no building materials on the islands, apart from some batako(bricks) when available, so therefore all materials have to be sent over on a boat which adds to the overall cost. I don't want to give a false impression on costs involved better you contact Pak Dayat via email (detail_arch@yahoo.com) and he will be able to give you a much clearer idea if you are able to outline your requirements.
Kind Regards.