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.
Door prices vary far more than for most home improvement purchases, and consumers may be quoted widely different prices for the same brand and model door from different retailers. Sliding glass doors (typically one fixed panel, one sliding; sometimes called gliding or bypass doors) typically cost $300-$800 for a basic 5'-6' wide set, or $600 -$2,000 with installation.