My daughter has just moved into rented accommodation being a 2 storey 3 bed house. The house has an internal garage above which is my grand daughters bedroom , where, before she had new carpets laid you could see through the floorboards into the garage. Should there be a fire resistant ceiling in the garage as I would assume this to be an area of greater fire risk?

Any wall or floor/ceiling between an integral garage and house, including any door into the house, should be 30 minutes fire resisting with the door fitted with a self closer.

Check out  Approved Document B (fire safety) volume 1: Dwellinghouses page 30.