The Black Hills Treehouse Plan is more than just a design; it’s an adventure waiting to happen! The 16’ diameter octagon shape adds a unique twist to your backyard treehouse, giving it an extra element of unexpected fun. This treehouse plan will help you build a 16' wide (flat to flat) treehouse on a single tree.  The floor space is 212 square feet which may be built into an enclosed treehouse, an open tree platform, or a combination of each.  Plans DO NOT Include Hardware. Get the Specialty Treehouse Hardware needed to build this plan. Hardware is specified, and the plan describes suggested siding or roofing materials. Still, you can substitute as desired - if you want our advice on which specific bolts you need based on your tree species or design load, please contact us.  If you are building a super heavy structure on top, don't hesitate to contact us for advice and assistance. Included with purchase: Tips, illustrations, and step-by-step instructions. These plans may be printed on regular 8.5x11 paper.