That is a small compicated job. Many window companies and others will shy away from this. pretty hard to reccomend someone without a location.

Its a suburb of detroit, mi. why will companies shy away from?

You need a general contractor. The drywall will come off the whole alcove. Framing redone with header. Probably some wiring in the way. Insulation. Exterior siding and trim. Drywall and trim. Then paint. The window install is the easiest part.

What does the home look like from the exterior? Interior shot of the room as a whole? It is a lot of work, as Hallett mentions above. I would not bat at an eye at someone telling you that the estimate would be $15K with permits.

This is a common job for most window companies in my area. It won't be cheap given everything involved.

You're going to spend $7,500.00 per window and more if your exterior is brick.