While the commercial door handle height is already 34 to 48 inch which standard you should install the knob and handle carefully if you choose to buy a slab door.
Standard door handle sizes.
Measure from the center of the door knob hole to the edge of the doorway to find the size of the door set.
This creates a more harmonious appearance.
Other backsets include 2 used by national and lori lock and 5 used by weiser weslock kwikset and others.
In most cases the door set which is inside of the door and controls the door latch will.
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.
It is more important that your door handles be consistent than that they match the standard door handle height.
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.
To measure your existing door you need to take a measuring tape and measure from the bottom of the door to the top of the door most common doors measure.
However the standard door handle size also considers the convenience of using it.
Standard exterior doors the standard size for an exterior door is 80 inches 6 feet 8 inches by 36 inches 3 feet.
Next you need to determine which direction the door opens in out left right swings.
Two standard backsets are 2 3 8 and 2 3 4.