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I'm installing a few new doors, and bought slab doors to save some money. I have a jig for boring the door knob holes, but I'm not sure where on the door to put the hole. Is there a standard height for door knobs?

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    Same height as the rest of them? :P Commented Feb 7, 2015 at 15:12

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According to the International Building Code, door knobs should be between 34" - 48" 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.

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  • Ironic for an international code to use the US/Imperial system of measurement as the primary system (and the metric system as secondary) when pretty much the entire world uses the metric system as standard: indy100.com/article/…
    – Max
    Commented Feb 25, 2018 at 7:19
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    @Max I think "International" in this case, just means "North American". And since Canadians are so nice, they just let the US do what it wants.
    – Tester101
    Commented Feb 25, 2018 at 16:52

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