Renovating a room doesn’t mean you take a sledge hammer and go crazy. You can add a classy look to any room without having to go to all this trouble.
Feel like that den is too dark? A window might not be enough to lighten up the room during the day. Instead of investing in numerous lighting fixtures, why not turn that window into an elegant French door? It’s not as hard as it sounds; though of course, it will take some work.

tired-of-boring-windows-covert-them-into-french-doors
Find the right French Doors to help your home improvement project

French door:  A door, usually one pair, of light construction with glass panes extending for most of its length. They also can be referred to as French windows.