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What is the minimum size of habitable rooms in a house according to the building code?
Wednesday, July 4, 2018
Habitable rooms must be a minimum of 70 square feet, with one wall not less than seven feet in length. Although the kitchen is considered a habitable room, it is exempted from the minimum area requirement (International Residential Code R304).
There are also two requirements in earlier versions of the code that have been eliminated: formerly, at least one room had to be 120 square feet or more, and the minimum area of a kitchen was set at 50 square feet.
Any area of a room that has less than a seven foot flat ceiling, or any area with a sloped ceiling that is less than five feet high, cannot be counted towards the minimum square footage requirements. Bathrooms, hallways, closets and utility rooms are not counted as habitable spaces.
By the way, no minimum total square footage of a residence is addressed by the International Residential Code (IRC) or Florida Building Code (FBC), but is usually specified by local zoning and deed restrictions.
Also, see our blog post What is the definition of a habitable space in the building code?
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