What is the minimum width for a hallway in a home?
IRC §R311.6model code
Hallways must be at least 3 feet (36 inches) wide (IRC R311.6).
The IRC sets the minimum width of a hallway at 3 feet (36 inches).
This is a clear-width minimum. Trim, handrails, or other projections can cut into the usable space, so frame the opening to hold a full 36 inches clear.
Related answers
- What is the minimum size for a required exterior (egress) door? — IRC §R311.2
- What size landing is required outside an exterior door, and how far can the floor drop at the threshold? — IRC §R311.3
- How big a step down is allowed at an exterior door threshold? — IRC §R311.3.1
- Do I need a landing at the top and bottom of the stairs? — IRC §R311.7.6
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.