A tree house, tree fort or treeshed is a platform or building constructed around, next to or among the trunk or branches of one or more mature trees while above ground level. Tree houses can be used for recreation, work space, habitation, and observation.
Friction and tension fasteners are the most common noninvasive methods of securing tree houses.
Stay rods are used for relieving weights on a higher elevation. These systems are particularly useful to control movements caused by wind or tree growth, however they are the used less often, due to the natural limits of the systems.
The construction of modern tree houses usually starts with the creation of a rigid platform.