Here's what I would do
Why not provide the measurements to home depot to get the window cost then add a figure for installation. They can tell you what to measure I would start at 250-300 a window to install. That is a guess.
This experience will give you an idea how the choices in Windows and impact the variables have on price. HD does have different qualities of windows.
I have installed my own Windows It was worth the thousands that I saved. Were they as good as the ones that were four times as much? Who knows, they were better than I had and will last 20 years.
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