A young couple has big dreams of a lighthouse treehouse atop a seaside seawall along the coast of Northwest Washington. Pete is challenged by the property’s incredibly steep grade and must deliver all of his materials to the site by way of barge only! The octagon-shaped, two-story, white-and-red shingled structure, which is housed among a group of cottonwood trees, features porthole windows, a wrap-around balcony, a nautical-themed interior and rainbow-colored glass. The couple, wanting to truly live off the grid, throws Pete a curve ball by asking him for a rainwater shower system, a composting toilet and supply power (where there is none). Surprisingly, Pete delivers a custom gift for the couple's pampered pooch: a 'backyard' high in the air!