One thing that has been puzzling me is who is responsible for the setting out of the slab, footing and piers etc? I'm getting a slab under the existing house as well as an extra 5 meters at the rear where the the house will be extended. Theres steel columns and steel joists that need to be installed at the rear as well as footings and post brackets for a deck and verandah.
At this stage, mistakes can be expensive and it's going to be cheaper to have all the concreting and steelwork done at once then get a building in from there.
Also, method of termite treatment you used?