In images 4 and 8 of this house, it looks like there is at least one, possibly two, glass panels set into the floor. Presumably they look down onto the swimming pool. I'm not bothered by heights and I've stood on glass floor panels in public buildings with no problem, but I really wouldn't want one (or two) in my living room.
Plus Ireland generally has a rather interpretive attitude to rules and regulations generally so I wouldn't be confident enough that they had met building regs to actually walk on the things.