Sorry but all one level means nothing above the garge . BTW most garages cannot have living space above them without rebuilding the garage . I need pics of your house and you need an architect for sure. I dislike bedrooms over garages so what is this space you plan . I often find floor plans of the original home can be tweaked to give a client just a better layout with no addition. Do you need a garage ? I have never had one that was actually used for a car. . We need mor einfo , pictures all in comment shere DO NOT start another post.