Watch out Swiss Family Robinson, this treehouse in Northumberland County, UK is 6000 square feet! Who knew that McMansions would appear in the trees?
treehouse
World’s Largest Treehouse McMansion
The Solar Hooch (Tower of Power)
The Solar Hooch takes treehouses to a new level (I could't resist). Imagine a backyard treehouse that not only collects solar heat for a comfortable sleep out on the coldest night, but also uses photo-voltaics to collect an excess of electricity- which is pumped back into the grid to make that less than carbon neutral urban home a little more Earth friendly. That is the concept behind the Solar Hooch- check it out.

The Salvaged Material Tree House
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This tree house was built over a period of three years from salvaged materials which otherwise would have gone to waste in landfills. It’s a retreat surrounded by wildlife and fresh air; but sadly it’s now threatened by the authorities who have ordered it to be torn down.
How To Build a Tree House
A treehouse is a place where you can give free rein to your individual creativity, as the examples in this article show. But while there may be almost as many types of treehouses as there are types of trees, some general principles do apply.