I own a cape cod style home in Milwaukee, Wi. I would like to know approximatly how much it would cost to put a full dormer across the back of the roof. It would be about [ 25 x 9]. There is already one bedroom and small sitting area in the loft area. I want to add at the least a full bath in the new dormer. I would like to here from someone who has recently constructed a dormer or a contracter who could let me know the approximate cost.