In search of more living space for their growing family, a Texas couple asks Pete to create a the biggest treehouse he's ever built - a ranch-style treehouse lofted in several hackberry trees on their sprawling property outside of Waco, TX.

An Irish family in Orange County, CA has the perfect olive tree in their backyard to nestle a Celtic-themed cottage. Pete devises a challenging circular design that includes a fireplace and even a rainmaker to mimic the wet Ireland climate.

An Austin, TX entrepreneur enlists Pete to build the world's first spa treehouse on her ranch retreat. Pete tackles plumbing challenges and builds an over-the-top spa equipped with a steam shower, a Japanese soaking tub and plenty of tranquility.