Sustainability expert Michael Mobbs was welcomed into the warehouse to introduce the next Off-Site Challenge: creating a site office made from recycled materials at Kimbriki tip. Black (Grey, Khaki and Orange Teams) and Gold Teams (Navy Blue, Sky Blue and Green Teams) each had five hours to create their offices, which would be judged on eco friendliness, craftsmanship and beauty. The Gold Team, led by Luke, hit an immediate snag with the positioning of their roof, while Michael expressed concern that the sun would turn the Black Team’s effort into a sauna. Taking measures to avoid that scenario, the Blacks did enough to secure the challenge, winning the Grey, Khaki and Orange Team’s each a solar panel package worth $10,000 for their houses.