first class(noun) the highest rank in a classification. first class, 1st class, first-class mail, 1st-class mail(noun) mail that includes letters and postcards and packages sealed against inspection. first class(adj) the most expensive accommodations on a ship or train or plane.
A very basic sliding glass door, without professional installation, can cost $300 to $500, and this is the type of door most people think of when they hear the term sliding glass door â a six-foot pair of plain glass panels inside a simple frame. An eight-foot door can run $800 to $1,200 without professional installation.
1 Costs double for impact-resistant sliding glass doors designed to withstand hurricane-force winds. 2  Mike Davidson Construction in Florida estimates that installing a 9' impact-resistant sliding glass door costs about $3,700, compared to $1,800 for tempered glass. With installation total cost can be $600-$2,000 or more, depending on local rates and the complexity of the project (ranging from replacing existing sliding doors of similar size and shape to creating a new opening in a solid wall).