iceflare

Depends on the extend, but definitely Electrical or Plumbing first. Carpentry will be the last.

Seriously, after my personal experience, I think it is difficult for the ID / contractor to rectify hollow tiles with other tiles, especially if only a few tiles affected So better upfront, have your contract to indicate what type of compensation you will want; $100 or $200 per hollow tile, etc If they are confident of their workmanship, should be able to deliver