Kevin McCloud revisits a couple who took on the task of constructing a sustainable two-storey timber house heated by glass panels in the Kent countryside. Mimi da Costa managed the project despite a lack of experience, while her husband worked, and intended to have it completed in 16 weeks. But as the complex build threatened to drag on for months it became unclear whether their home would succeed in blending into the landscape and providing them with a greener, healthier lifestyle. Last in the series.