How To Measure
If you don't have enough space inside the windowsill (5 cm) or you have any obstructions in the window to stop the blind from working you must measure outside the recess and take it over about 5 cm on top, bottom and sides like below.
Attach a picture like this to your order
If you have tiles or granite at the side of your windowsill sticking out and will be in the way of the blind when you close it you have two choices
1. Measure your width up to the tiles and you will have a small opening at the sides of the blind.
2. measure the tiles as a cutout in the blinds (as in the picture) Cutouts will be an extra cost