Let us simplify the problem. The installation height depends on many aspects. But the most important one is the User's height. The installation height must fit user's height, because indoor entry door handle cannot be installed too high or too low.
I searched on Google and the results are as follows:
Cfg.gov.uk Most people choose 900-1000mm
The United Nations website is also 900-1000mm
On the Manchester University website, the height of 1000mm is suitable for the disabled.
The industry association of a city described that the center of the door shaft should be 900-1000mm.
The height of indoor entry door handles should depends on the person's average height, then the height of person's hip. The average height of person searched on Google is 1.7 meters for men and 1.6 meters for women. Let's average it to 1.65 meters, and the distance from the hip to the ground is generally 825-1089 (golden ratio), and average it again, about 957mm.
Is 900-1000mm the answer? There are some exceptions. The installation height of the handle does not match the door, which is not visually beautiful. In addition, at the entrance to the swimming pool or other waterscape exits, the indoor entry door handle is raised and keep out of children's reach .
