The international building code has established doorknob height between 34 and 48 inches above a finished floor.
Standard door handle hole size and position.
If they are more than inch off the standard height you will want to match all of the pre existing door handle heights in your home.
Installers typically drill the hole centered 36 inches above the floor if not specifically instructed to do so differently.
Lock bore the diameter of the hole for the lock body.
Most of the current locks require the standard 2 1 8 bore.
Measure your existing door knobs from the floor up.
This creates a more harmonious appearance.
If one wants to replace their locks on doors that have smaller diameter holes there are 2 options.
The standard bore is 2 1 8.
Through the edge of the door there is a 1 cross bore that extends from the edge of the door through the bore hole.
Many older doors had bores that were been smaller.
The bore hole is the large diameter hole where the door knob is mounted.
It is more important that your door handles be consistent than that they match the standard door handle height.
Standard door preparation for door knob or lever handle.
Measure from the center of the door knob hole to the edge of the doorway to find the size of the door set.
In most cases the door set which is inside of the door and controls the door latch will.
Generally the knobs should be of a free moving slide action.
Their position should be between 900mm 1050mm 35 5 41 5 inches above the floor.