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Lisa,
A project like this can range in cost. A Good starting point for front porches can be around $115/square foot.
Vinyl window replacements can range from $400-$600 depending on the brand. Capping the windows can be an additional charge.
If you go with a Lowen, Norwood, or Lincoln wood window you could be spending north of $1,500-$2,000/window.
Anderson & Pella wood windows with aluminum cladding can be in the $700-$1000 per window range.