There are a number of ways to work out the height for your door handle. You can measure the height of the handles on the other doors in the house and use that. Alternatively, you can read the instructions that come with the door handle kit and use that height. Or you can use the standard height for a handle, which is 1050mm off the floor. After deciding the height of your door handle, measure and mark it on the side of the door. Before you start installing the door handle, place a door wedge under the door to stop it from moving while you’re working. Move the wedge as you change the side of the door you’re working on.