Definitely not normal. Is it the usual three monthly inspection or is it the first one, because that might be different. It might be for an entry report. Of course the other scenario might be that the place is being put up for sale, or to be re let, but if that is the case taking pictures of the interior of a tenanted place without the permission of the tenants is a definite no no, at least it is here in Queensland, don't know about other States but I would be surprised if it was allowed. Outside pictures would be a different matter I think.