Treehouses are popular among people of all ages including children and adults alike. Some tree houses are constructed to live in and some to play. Regardless of their purpose, treehouse designs are becoming more elaborate every year. Treehouses and treehouse design kits for children are available from manufacturers of playhouses and other playground equipment. There are a huge range of styles, sizes and prices for children's treehouses and tree forts ranging from a few hundred dollars to $60,000 depending on the design. When purchasing or constructing a tree houses the most important things to remember are safety and durability, regardless of who it is for and its purpose. For treehouses which are designed for adult use, you'll want to consult with a building professional as to building code requirements prior to constructing the treehouse.