If you want to add light and fresh air, these windows are perfect for any treehouse and are the ones that are included in the plans that come with our Firefly Signautre DIY boxes. You will need 7 windows for the Standard Firefly plan if you are following the plans properly.
 
These Glass Windows are lightweight and easy to install on a backyard treehouse. The sizes are smaller which make them proportionate to normal sizes for small and medium kids treehouses. They open and have screens. They are also less than half the cost of buying insulated windows from traditional retailers. All of these features make them excellent windows for treehouses.