Art, if I understood him correctly, he will add a gable end to match the other end of the house, I'm guessing a bedroom, that extends out from the main body of the house.
What I see as a problem would be in redoing the grade of the driveway to match the addition of the garage, you would also have to do something to the yard on both sides, or there would be a drop off from the drive to the grass. You could stair step that with stones to make an easy walk up, but you'd be in trouble if the car ever went over the edge. (Think older years and mis-judging the drive when turning in )
So what is behind the garage? If back yard, can you go back that way? I'd think, if that is possible, that would be the best thing, and probably cheaper by quite a bit. If that isn't workable because of more house behind the garage, then to the side if you have enough room before the easement would be best. It could actually be a third garage. Just some random thoughts. Jim.
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At a minimum, I'm Pentatoxic...but most likely, I'm a Pentaholic. There seems to be no known cure. Pentatonix, winners of The Sing Off, season 3