When measuring for a Bahama shutter or a Colonial for that matter, you’ll measure from inside to inside like shown. We then take those measurements you provide and add what we need to make the appropriate hardware work.
This is a close up of the illustration. Showing the correct measurement for the width of this window being thirty three and a half inches.
The likewise is how you would measure the height of a window when ordering. It’s measured from the top of the window up against the trim all the way down to the window sill or trim depending on window style.
This is the close up showing that this window’s height is thirty fire and three eights inches.