If you already have a contract, is the inspection cost stated in there? If not they would be forced to issue you a variation which you could of course object to.

5. Also prewiring for solar ? What should I ask from the builder ? If you have selected someone to do your solar, see if they will come and do a pre-wire. We've done this on a couple of builds and it means that the wiring is all in the walls rather than running conduit up the outside of the house.

That's what most do, Of course you wouldn't know that... what is it you do again apart from troll posts and give poor advice? The irony here is real. I've been quietly reading these forums for months... all you do is troll and giving poor advice. I don't think i've ever seen a constructive response...