I'm not sure when the ss gets assigned, I'm assuming even before the pad gets laid but I'm not sure. Our first meeting was half through the bricks (last week).
Our guy seems ok but we've had a couple of muck ups so far. He has got them sorted pretty quickly so not much to complain about.
Our new house is about 5mins from our current house so I plan to be a regular and annoying visitor at least every week, hope my ss doesn't mind