Probable cost ranges from $8000 to $15000, and maybe up to $20000 if you are going to make it as nice as an inside room, depending on the quality of the product installed and whatever else is needed such as electrical, lights, fans, additional outlets, type of flooring, etc. Add more if you are going to add heat and air. Usually there is more to it than just "adding windows". Be sure to talk to several contractors to get their ideas in addition to a quote.
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