Seeing Stephanie's point, I want to clarify my answer. I sell a lot of homes in South City to first time home buyers and they want outside space, but they like homes that have a true, the NEW type of sunporch, which is what I may be visualizing. Maybe I should be more clear. Many young buyers do not like the old small add-on that feels more like a walk-thru dark covered back porch where the only use is to throw your shoes after working in the yard. This is not considered a sunporch in my mind or my buyers, but merely a mud room. However, what I consider a sunporch is a room (at least 10 x 10, bigger preferred) that has large windows on 3 sides, you can sit in a chair and be at the same height of the windows or higher, and the roof is high enough to let light shine into the room. The room should beam with light and make you feel like you are outside, but provide the cover and protection from the rain and bugs. I have seen old homes with the new modern sunroom addition and my buyers love it. Buyers like the bright room to relax in and entertain guest. If you were thinking about making just an "add-on" like many of the homes in the city, then I agree that a deck (10 x 10 or bigger) would be a better feature. I just didn't clarify myself and explain what I consider as a sunroom.