This is our basic privacy screen design for windows - the regulations are that they must be a minimum height above the floor 1700mm when standing in the room. Window sills are set at all different heights, this will determine the height of your screen. Once this height is determined it is then possible to work out the size of the screen. It's also important to have an extra blade below the sill in the line of site.
How to Measure Windows for Quoting Purposes
Measure from the floor to the top of the window sill
Now open the window and measure the width of the window from revel to revel, or from render to render