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.
Turning windows into french doors.
If you want to be able to open the house up and let lots of air in a door wins every time.
Converting an existing window into a door opening with bi fold french doors is something that will take preparation and time to do but the end result will be fabulous.
If necessary build steps to lead up to the door.
There s also another option you might not have considered yet converting an existing window into a french glass door.
You can expect an average cost of 525 and up.
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.
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.
Not only do you have to manage securing permits and the window company but you may also have to hire additional trades like drywall installers painters or electricians if you want the work to look seamless.
Once determined nail the stringers into the wall for support.
Doors offer almost everything a window can offer and more.
The cost to install french doors starts at about 400 and with labor estimates running between 75 and 180 per door.
Dan faires explains why it s better to let a professional install french doors.
And one of the most cost effective remodeling jobs you can do is turn a window into a door.
The kits have different assortments of parts and the dlx kit has enough parts to do a standard 6ft patio door 2 each full surround 15 lite grids 3 panes across and 5 panes down or several windows.
For example say you have a finished opening size of 72x80 then buy two sets of doors that are 36x80 and install them side by side according to the instructions.
The patio door after it has been installed.
If you want lots of light to come in a door can do that better than a window.