The tops of windows and doors usually are about the same, unless you raise the windows and have a high ceiling to make the room look taller (bigger). If you have 7' ceilings in the basement-- after heating ducts, plumbing soffits, etc. , it must rough-in at 8' or so. Still, a normal door is 82-84" (plus trim) off the finished floor. With an egress window top the same, 82" - 42" (below the opening for egress 44" rule) = 40" - 2-1/2" of sash = 37-1/2" of height==== 22" wide opening + 2-1/2" = 24-1/2 + 26= 50" wide so a 6'x3'-6" window? Remember the clear opening has to match this chart: http://illowaicc.org/uploadedFiles/I...20Openings.pdf
You could drop the window some by getting a custom egress size that would give you more room. Why a 48" high, I think my 42" high would work, ask a window person at the store. Just set the top of the 42" high window at 80-81" above floor. You will have 3-4" over the window, and 1-2" above the door. Masonry skills - Google Books
Drain the well line out back, naturally.
Be safe, Gary