Welcome, my name is XXXXX XXXXX I will do my best to help you with your issue
All I can give you is the average range for your area. If that's acceptable I need your zip code
The range is $1 to $1.50 per square foot.
The price variation is based on the level of difficulty and complexity
If your windows have many small panes with true divided lights and you have a lot of trim then you would be closer to the high end of the range
If there is a lot of prep work, scraping, caulking & spot priming this too will push you towards the higher end of the range