A recess measurement is the opening space inside of your window. A recess-fit blind will sit within this opening of your window, without overlapping onto the wall. To take the correct measurements for a recess-fit blind, accurately measure the inside width (Red Line) of your window in three places, writing down the narrowest. This is your recess width.
Then measure the inside height ( drop - Blue Line ) of your window in three places, writing down the shortest. This is your recess height.
We will reduce your recess sizes by a small amount to ensure the blind fits within the opening accurately without catching
Use a metal tape measure for accuracy.
Measure across the window width, adding an extra 100mm to the total width to allow a 50mm overlap either side of the window to block out light effectively.
Decide where you want the bottom of your blind to end and measure the length of the window from the top of the fitting to this point.