At what height should a door knob be?
According to the International Building Code, door knobs should be between 34&quot; - 48&quot; above the finished floor.

International Building Code 2012
Chapter 10 Means of Egress
Section 1008 Doors, Gates and Turnstiles
1008.1.9.2 Hardware height.
Door handles, pulls, latches, locks and other operating devices shall be installed 34 inches (864 mm) minimum and 48 inches (1219 mm) maximum above the finished floor. Locks used only for security purposes and not used for normal operation are permitted at any height.