For blinds going into the window recess, measure the width first. With a tape measure, measure the width at three points, top, middle and bottom of the recess. To ensure the blind will fit take the smallest of the 3 measurements.
Then measure the drop in three points, left, middle and right. Again taking the smallest measurement. If your measurements are entered into our website as ‘Recess’, we will take 10mm from the width and drop to ensure the blind fits perfectly into the window recess.