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 They are made from panes of glass with an aluminum, wood or vinyl frame. 2  A sliding glass door costs around $500 to $2,000. 3  Exterior French doors, similar to sliding glass doors in construction but designed to swing out. 4  Sold in pairs, they begin at around $1,000 and can cost up to $3,500 for high end French doors. A basic knob and lock set costs $50 to $100; designer exterior door hardware costs more. 2  Exterior door installation is a manageable DIY project. 3  However, an exterior door install for solid-wood doors, sliding glass doors or French doors can be quite complicated.