Typical costs: 1  Expect to pay an average of $300-$700 per window for replacements placed inside existing (and structurally intact) window frames, but it could go as high as $1,000 per window, for a range of $3,000-$10,000 for a one-story, three-bedroom home with 10 windows. Larger, two-story homes with more windows can run $10,000-$20,000.