I am looking into adding a bathroom in the attic master bedroom. It does look like they had a toilet at one time in the area where existing dormer is. It is like a 7X7 room there. To put in a bath we definitely need to change roof structure of existing dormer to flat. Neighboring house has exactly what I am thinking about (on the right in the picture). Since I am in budgeting stage, I would love to find out a ballpark figure of how much it could cost us to redo this dormer. Any input would be appreciated.