Stair Building Code Basics Every Homeowner Should Know

Rise, run, and headroom requirements vary by state — here's what to know.

Riser height has a maximum for a reason

Most codes cap riser height around 7.75 inches — steps taller than this become a real trip hazard, especially for stairs used frequently.

Tread depth affects safety too

A minimum tread depth of around 10 inches ensures there's enough foot support on each step, particularly important for anyone carrying items up or down.

Headroom is easy to overlook

Most codes require at least 6 feet 8 inches of headroom throughout the stair run — this matters especially in basement or attic conversions with limited ceiling height.

Handrail requirements aren't optional above a certain rise

Stairs with more than a few risers typically require a graspable handrail on at least one side, per most building codes.

Always check locally before finalizing a design

Building codes vary by state and sometimes by municipality — confirm your specific requirements with your local building department before committing to a design.