What is the minimum width or dimension for a habitable room?
Habitable rooms must be at least 7 feet in any horizontal direction; kitchens are exempt (IRC R304.2).
Beyond the 70-square-foot area minimum, the IRC requires habitable rooms to be not less than 7 feet (2134 mm) in any horizontal dimension.
This keeps a room from satisfying the area requirement while being too narrow to use. Kitchens are exempt from the minimum-dimension rule.
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Related answers
- What is the minimum floor area for a habitable room? — IRC §R304.1
- What is the minimum ceiling height for a habitable room? — IRC §R305.1
- What is the minimum basement ceiling height, and can beams or ducts hang lower? — IRC §R305.1.1
- How much window area do I need for natural light and ventilation in a room? — IRC §R303.1
- Does a basement or basement bedroom need an egress window? — IRC §R310.1
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Adopted edition and local amendments vary by city and county. Ask Donnie checks your jurisdiction and cites the exact adopted section.
Ask Donnie →General information based on the International Residential Code (a model code). This is AI assistance to verify — not legal advice. Confirm the adopted edition and any local amendments with your local building department (AHJ) and a licensed professional before you build.