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Season 12, episode 5. Keep your place, move between servers, and stay ready for the next episode.
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The Derelict Water Tower
Kevin McCloud marks the 100th episode with one of the programme's most ambitious projects to date. Leigh Osborne and Graham Voce want to convert and extend a landmark 150-year-old water tower in central London into a luxury home. Grade II-listed, derelict and with 6ft-thick walls, it's a huge challenge for the pair, who also plan to build two structures at the base - a lift shaft connected by a series of glass tunnels, and a modern living space. The result will be a four-bedroom property over nine floors, complete with a room at the top offering spectacular 360 degree views across the capital.
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Episode 1: Cloontykilla Castle, Ireland
Episode 2: The Computer Cut House, Herefordshire
Episode 3: The Glass Cubes House
Episode 4: The Thames Boathouse
Episode 5: The Derelict Water Tower
Now playing
Episode 6: The Edwardian Artist's Studio
Episode 7: Isle of Skye: The Larch-Clad House
Episode 8: London: The Joinery Workshop
Episode 9: The Tree House: Revisited
Episode 10: The Disco Home: Revisited