Tree houses have been created since the 1700's, even Queen Elizabeth herself had a tea tree house. They have not always been called tree houses, but they still existed. They come in all shapes and sizes. At one time Asia did not even know what a tree house was! We have some of the greatest tree house blueprints, from small projects to the year long projects! So if you want a tree house just come and check out our blueprints! Sincerely, Tree House Co.