Kevin McCloud returns to Gloucestershire to visit Jon and Noreen who, in 2013, planned to build a three-bed treehouse on a half-acre patch of woodland. Their stacked three box design was to be almost gravity-defying to avoid harming any tree roots and a mirror glass ground floor to reflect the surrounding trees but their £250,000 budget didn't seem to match the project's high ambition. Despite having worked hands-on for long hours with help from friends and family, by 2016 the house was barely ready enough for them to move in and the money had run out with the project not finished. Seven years later, Kevin returns to see their progress.