When you consider installing a new staircase or replacing an old one in Texas, the same rulebook always crops up: the International Residential Code (IRC). Most Texas cities — including Austin, Dallas, Houston and San Antonio — adopt a version of the IRC as their residential building code. No one would call it light reading, but the core requirements are more straightforward than they first appear.

We have put this guide together so you don't have to spend hours trawling through the code yourself. We have gathered clear answers to practical questions for self-builders, contractors, architects, and homeowners embarking on renovation projects. How high can each step be? How wide should the stairs be? Where does the handrail go? And how do you pass your building inspection the first time?

All information here is based on the current IRC provisions for stairways as commonly adopted across Texas. Always confirm the specific code edition and local amendments with your city or county building department.

Texas Staircase Requirements at a Glance

The IRC governs staircases in one- and two-family dwellings. Commercial and multi-family buildings fall under the International Building Code (IBC), which has stricter requirements. For most homeowners, the IRC residential rules are the ones that matter.

Core Dimensions You Need to Know

Five key measurements determine the bulk of IRC compliance. Get these right, and the rest of the design usually falls into place.

  • Riser height: This is the vertical height of each step. The IRC maximum is 7¾ inches (196mm). Every riser within a flight must be nearly identical — the greatest riser height may not exceed the smallest by more than ⅜ inch. Inconsistent risers create a classic trip hazard because our brains don't expect the change.
  • Tread depth: This is the horizontal depth of each step, measured from nosing to nosing. The IRC minimum is 10 inches (254mm) with nosing, or 11 inches without. Like risers, tread depth must remain consistent throughout the flight.
  • Width: The IRC requires a minimum clear width of 36 inches (914mm) above the handrail height and below the required headroom height. In practice, most comfortable residential staircases are wider, especially where furniture or daily traffic needs to pass through.
  • Headroom: A minimum of 6 feet 8 inches (2032mm) of headroom is required, measured vertically from a line connecting the nosings.
  • Handrails: Required on at least one side of any flight with four or more risers, set between 34 and 38 inches above the nosing line. The rail must be graspable and continuous for the full length of the flight.