I love homes with porches. I have two of them and neither is enclosed. It is like having a couple of extra rooms during the warmer months.
What is a porch? I like to say it is just like the decks in suburbia but with a roof over it. There are a few flavors of porch and sometimes they can even be included as part of the total square footage of a home.
A 4-season porch is a room that functions as an interior room, but allows you to take in the views of the outdoors year-round. It has permanent heat and is included in the finished square footage of the home.
A 3-season porch has windows with integrated screen systems and can be used for long periods throughout the year. They can shield you from outdoor elements such as rain, wind, sun and insects, but 3-season porches are not heated. Therefore, it is not a part of finished square footage, but is considered an enclosed space.
Screened porches are a covered porch that has screened openings instead of windows. A screened porch may be less sheltered from the outdoor elements, but still offers protection from the sun and bothersome insects in the summer. Screen porches should not be included in the finished square footage.
Just a deck with railings and a roof over it. A great place for plants and chairs or a porch swing. Not really even a one season porch here in Minnesota. More like a two month porch. These porches are very common in the oldest parts of St. Paul and no they can not be included in the finished square footage.