cm (300 max)
Decide whether your blinds will fit inside or outside the window recess. To fit inside the window frame must be at least 7.5cm deep to accommodate the operating mechanism.
For Inside the Window Recess:
Measure the total width from inside left to inside right and make a note. Do this in three places to allow for any irregularity in your windows. Make a note of the narrowest of these measurements, to the nearest millimetre.
For Outside the Window Recess:
Decide how far you want the fabric to overlap on all sides; we normally recommend at least 5cm. Measure the width from outside left to outside right, then add an additional 3.8cm to allow room for the operating mechanism.