Watch Grand Designs Season 18 Episode 6 Online. Best and Free Online streaming for Grand Designs TV Show. We picked the best sites to stream s18e06. Simply pick a site below and click "Watch Now!" button next to it. Some of the links may be broken, please upvote the working and good links so other users see those links for Grand Designs Season 18 Episode 6 s18e06 at the top of the list.