TreeHouseSupplies.com provides tree house kits that include diagrams, instructions and materials for constructing square, rectangular, hexagonal and octagonal structures ranging between 6 and 16 feet in width or diameter. Tree house kits such as these are typically suitable for construction on one or two trees.
Custom designs are also available for an hourly fee and are ordered on the Tree House Supplies website. These designs are custom modifications to existing plans offered by the company. Other companies, such as Tree House Guides, provide proprietary instructional kits for tree houses, such as its Alpino, Outpost and Terrazza designs. These design plans and diagrams are available in PDF format and are ordered from the company's website, TreeHouseGuides.com. Some of these plans have provisions that allow the tree trunk to pass directly through the exterior deck.