Railing Building Code Requirements You Should Know

Height and spacing requirements vary by state and application.

Height requirements depend on application

Most codes require 36 inches minimum for residential deck railing, with 42 inches often required near pools or in commercial settings.

Baluster spacing prevents a real safety hazard

Most codes require spacing between balusters to be no more than 4 inches, to prevent a small child from passing through or getting stuck.

Stair railing has its own requirements

Stair railing typically requires a continuous graspable handrail on at least one side for stairs with more than a few risers.

Load requirements matter, not just height

Railing must be able to withstand a specified lateral load per code — this is a key reason DIY railing should still meet code specifications, not just look right.

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.