A bedroom falls under the “habitable attic room” category and will therefore require council approval. Staircases leading into the room need to comply with the Building Code of Australia (BCA) and it is compulsory to install windows for ventilation and adequate natural light. The existing structure of the ceiling and roof are not adequate to carry the load of a new room and its live loads. A structural floor frame and additional structural work to the roof and walls is standard practice in creating a habitable attic. To comply with the conditions for heights and size of habitable attics, 60% of the attic room must measure a minimum of 2.2m from floor to ceiling.
Dormer windows are particularly well suited to the attic space, helping achieve more area above 2.2m to comply with council rules. They also create a new view, invite natural light, provide better cross ventilation and add character to your home from the street view.