Dummy handles are surface mounted and may be located anywhere on the door you choose but they re usually located to match the appearance of nearby operating locks.
Standard door handle sizes.
However the standard door handle size also considers the convenience of using it.
Then you need to measure the width most common width are 2 6.
In most cases the door set which is inside of the door and controls the door latch will.
Other backsets include 2 used by national and lori lock and 5 used by weiser weslock kwikset and others.
Measure your existing door knobs from the floor up.
Measure from the center of the door knob hole to the edge of the doorway to find the size of the door set.
Two standard backsets are 2 3 8 and 2 3 4.
This creates a more harmonious appearance.
Standard exterior doors the standard size for an exterior door is 80 inches 6 feet 8 inches by 36 inches 3 feet.
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.
Next you need to determine which direction the door opens in out left right swings.
It is more important that your door handles be consistent than that they match the standard door handle height.