[villagetinker]

OP, cost will vary depending on the home construction, mobile, modular, wood, poured concrete, block, as well as the type of window. You may want to add some details to get better replies. Also are you interested in a particular type of window and window construction, vinyl, wood, aluminum for example. I did my own up north, the original windows were an odd size, which meant a LOT of filler wood and smaller replacement windows. I realized the width was a standard size, and if a made the opening 3 to 5 inches longer (depending on the window) I could use standard windows which were 1/3 the cost of custom windows. Replaced 10 single pane aluminum windows with double pane vinyl windows for around $120 to $150 per window, and my labor.