You need to look at your current window and figure out how much of the window cutout you can use for your new bi fold french doors.
Turn a window into a french door.
You will want to measure the height and width.
So you ve just built a new deck on the back of your house and those once lovely double windows in the living room would now make a better door sliding glass or french out to that awesome deck.
Also measure the window s location on the wall compared to where you will place your door.
Dan faires explains why it s better to let a professional install french doors.
The good news about turning a window into a door assuming it s wide enough is that the advanced carpentry required for altering a load bearing wall.
Here is a recent response on cost to install a sliding glass door which is quite a bit easier than a french door but same general size.
Installing a french door between a living and dining space creates privacy without the loss of an open feeling for example.