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How to Measure Bay Window
Bay window measurements
You will have to first identify the depth of your headrail . it is vital with bay windows as the blinds meet in the corners of the bay and they should not overlap or touch for perfect operation of the blinds.

Square Bay
There are three options as below:

For option A you will measure tight corner to corner and then deduct the size of the headrail from each of the side blinds and select inside recess option.
For the drop will be ceiling to window sill/floor or from where you would like the blind to hang from to where you would like it to finish and always select inside recess option.

For option B you will measure tight corner to corner and then deduct the size of the headrail from each side of the front blind measurement and select inside recess option. For the drop will be ceiling to window sill/floor or from where you would like the blind to hang from to where you would like it to finish and always select inside recess option.

For option C you will take two pieces of cardboard cut at the size of the headrail and meet them head to head in the corner of your bay as in the picture above and then mark on the window frame where the cardboard touches the frame. Select inside option for recess.

NOTE: Please make sure the cardboard pieces touch when measuring.

For the drop will be ceiling to window sill/floor or from where you would like the blind to hang from to where you would like it to finish and always select inside recess option.

Any other bay

You will have to measure each window using a piece of cardboard cut square at the size of the headrail and following the diagram below.
NOTE: Please make sure the cardboard pieces touch when measuring.

Cardboard pieces cut at the size of the headrail

Once you have decided where each blind will sit you will mark on your window frame and measure between the markings. Always give us the measurements as inside recess.

For the drop will be ceiling to window sill/floor or from where you would like the blind to hang from to where you would like it to finish and always select inside recess option.