Thanks for all the help.
But I can't think of another solution for my problem other than to be a bit less realistic in my model I guess.
I am making a promo-movie for a new to be built eco-holiday house and we want to show both overviews and details. Perhaps I went about it the wrong way and I better make multiple models (big, less detailed ones for the overview, and small, detailed ones for the zoom-shots)
That would probably make more sense anyway.