No. We can build you a self-supported treehouse next to a tree. But if you are after a structure completely separate from the ground, fully supported by the tree in question, you will need a big tree. The treehouse support tabs (treehouse attachment bolts) must be screwed into a stem with a diameter of at least 300mm. This provides an anchor of maximum strength and safety for the structure built on top.
We are happy to build you a structure involving a tree in many ways, even if the tree is not there for structural support.