Here are some prior similar questions with answers FYI - note in a solid brick wall you first have to frame out the rough opening, which should be done by a Masonry specialist - a LOT of houses have ended up with diagonal cracking in their walls from window installers or carpenters or such creating rough openings without the proper procedure and temporary support during the process.
For a sliding glass door, unless an unusually large steel beam is put in as a header, the mason should create an arch in the brick over it to transfer the load to the sides of the rough opening - with the brick arch typically extending 3-4 feet above the door opening, so the brick work can be more substantial than you would think - commonly on the order of $500-1000 more than the cost of equivalent opening in a wood frame wall, which most of the previous questions assume.
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You can find more similar questions with answe4rs on typical price and related sliding glass door issue, in the Home > Doors (or is it Windows and Doors ?) link under Browse Projects, at lower left.
And note, with recent dramatic glass pricing increases, the typical cost of a sliding glass door unit has gone up $500-700 from some of the older questions answers from a few years ago.
