You have too many posts on the same topic. The way you’ve asked here is like asking what a car costs. Add this information to your other post with photos.

What difference does it make? Taxes, commercial property costs, payroll, workman’s compensation insurance, utilities costs, and many other variables affect a company’s overhead in any given area. This affects the sell price for any product. I do wish basic economics were taught in school.

Correct or incorrect install? Someone who knows what they are doing will typically charge more.

3500 per window give or take 2k .