model as it makes his life a lot easier, or is the owner of the building prepared to pay a bit more money so that the contractor and other parties involved have an easier job and save him some money in the end. or are you prepared to invest a little extra time and money to make a good model so that you will not have surprises during construction and save time there as thing do get clear sooner in a 3d model compared to 2d drawings. not having to solve all sorts of issues during construction saves everybody money in the long run.
so, it seems there is no definitive 