Firstly decide if you wish your blind to sit Inside or Outside of your window recess.
We ask you to take 3 different width measurements within your window recess - going right into the corners and taking account of any protruding tiles or window latches / handles. You should send us the SMALLEST of the 3 measurements.
Again we ask you to take 3 measurements from the top of the recess to the sill and send us a note of the smallest / narrowest one.
It is a personal preference to choose whether to have blinds inside or outside the recess ( with the exception of windows that open inwards - in this instance blinds would be required to be fitted on the outside of the recess).
Measure the size of the recess then add the extra amounts listed below to ensure full coverage.
To minimize light leakage we recommend the blind overlaps the window by 5cm each side and 7cm at the top. The overlap at the bottom should take into account any obstacles such as a radiator.