What is the minimum ceiling height for a habitable room?
Habitable rooms must have a ceiling height of not less than 7 feet (IRC R305.1).
Under the International Residential Code, habitable rooms, hallways, and bathrooms must have a ceiling height of at least 7 feet (2,134 mm).
There are common allowances — for example, beams and sloped ceilings can dip lower over part of the room — so check the exceptions in R305.1 for your situation.
Need this scoped to your jurisdiction?
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.