The 2012 international residential code requires an attic access opening for attics with an area greater than 30 square feet and a vertical height in excess of 30 inches.
Legal attic ceiling height.
There is no height restriction under stairs.
The rest can be less than 7 feet.
Room area is this case is calculated as the total floor space with walls at least 5 feet tall.
Living areas and hallways must have a ceiling height of 7 feet or more and bathrooms and laundry rooms must be at least 6 feet 8 inches tall.
The minimum ceiling height specification for non habitable rooms is 2 1m.
To pass code there must be at least 70 square feet where the ceiling height is 5 feet or.
Attic spaces can be provided by having rooms with slanting roofs.
In an attic room with a sloping ceiling or projection below ceiling line or non habitable room or similar a height that does not unduly interfere with the proper functioning of the room or space.
Habitable spaces that have a sloped ceiling shall at no point have a ceiling height less than 5 feet and no less than 50 of the floor area shall have a ceiling height less than 7 feet.
In a stairway 2 0m measured vertically above the nosing line.
At least 50 of the usable floor space should have a ceiling height of 7 5 ft.
Showers and tubs with showerheads must have a 30 inch by 30 inch area that has a ceiling height of no less than 6 feet 8 inches at the showerhead.
Level ceilings must be at least 7 feet high and at least 6 feet 4 inches under beams ducts and other obstructions.
Attics lofts and low ceilings.
If a room has a sloping ceiling which is common in attics at least 50 percent of the room area must have a 7 foot ceiling.
If a room has a sloped ceiling at least one half of the finished floor area must have a ceiling height of at least 7 feet.
To prevent homeowners from creating living space that does not allow occupants to stand up.
The minimum ceiling height in rooms with sloped ceilings such as a finished attic space is 7 feet over at least 50 percent of the room area.
More than 50 of the ceiling space should be on average a minimum height.
Although it is common to be 2 4m in these areas.
Examples of these are the bathroom hallway and garages etc.
For rooms with sloped ceilings at least 50 percent of the required floor area of the room must have a ceiling height of at least 7 feet 2134 mm and no portion of the required floor area may have a ceiling height of less than 5 feet 1524 mm.