Stair Requirements for Single-Family Homes in California (2025 CRC & CBC)

By Sunwoo Kim • Published 11/22/2025

Stair design looks simple—until your permit reviewer starts asking about width, landings, risers, slope, and fire protection. Here’s a concise breakdown of what the 2025 California Residential Code (CRC) and California Building Code (CBC) require for single- and two-family dwellings (R-3, Type VB).