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