Good morning Andrea, We love this project as well. There is a professional pizza oven behind the gable end brick face. The windows are a porch enclosure product called Sunspace that is manufactured in Canada. They are not four season(insulated) but provide complete coverage from the outside elements while sliding left or right and overlapping on each other accordion style. The windows have vinyl panels inside an aluminum frame. There is a permanent screen on the outside. The two sides have four panels per unit and will provide 75% open air when fully open. Best of luck with your project. Greg Rehm