Our Sunrooms come standard with large 40" x 60". Windows These windows allow the maximum amount of sunlight to illuminate your sunroom. The windows start about a foot off the floor and reach to a foot from the top of the walls. When open, they also allow in the most breeze, while the screen keeps out the unwanted bugs. These windows have mullions on the inside of the glass as well as a lock. Of course as with any of our structures, you can customize your sunroom by having less windows as well. Be sure to discuss this with your Project Advisor.