This would translate to a bare minimum of 7 x 10.
Building regulations attic bedrooms.
70 square feet or more of floor space.
Openings for ventilation having a least dimension of not less than 1 16 inch 1 6 mm and not more than inch 6 4 mm shall be permitted.
Building code requirements for bedrooms by nathalie mornu updated april 12 2018 as long as half of the ceiling is 7 feet tall the height restrictions for a bedroom are met.
At least 7 feet in any direction.
To satisfy building codes you need to have enough space in your planned attic conversion to meet the following regulations.
The first code requirement we ll look at is the minimum space requirement.
Exterior openings into the attic space of any building intended for human occupancy shall be protected to prevent the entry of birds squirrels rodents snakes and other similar creatures.