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The best way to get a confirmed price is to look up window installation companies on your local BBB web site.
Remember also that the window will need to be tempered glass, if you try to DIY this project. While you should consult with a local remodeler (find a chapter of NARI near you, or a Builders Association, a local NAHB affiliate... or better yet, find a pro here on GuildQuality with great ratings!) if you are simply looking for a range of prices to help you decide feasiblity, I can tell you this much: I can't imagine any circumstances that would allow this to be done right for less than $2000, and it could possibly be as much as $5000 (and hopefully not more) if it was an extremely difficult situation or an unusual window. I hope that helps. Good luck!
There are a lot of questions that would need to be answered. Here are just a few:
1. What is the size of the window you are looking for.
2. What type of material- vinyl, wood, fiberglass?
3. what style of window are you looking for? casement, double hung etc?
As a company we require that we meet with a customer just to find out all of the details, measurements etc. At this same meeting we give you a free written estimate right in hand. This will help you know exactly what you can expect to pay and the work we will cover.