This Old House goes to London for its first overseas project. Our host meets wit hhomeowners Jeremy and Carla Vogler -he's American, she's Australian - while our master carpenter visits their British contractor, David Booth, at one of his jobsites. With their realitor, we see two other flats the Volgers considered before buying the raw-space top floor of a circa 1850 townhouse, which they propose to open up and modernize. Our host visits an architect to discuss the planning permission necesary before the mansard roof can be altered or a roof deck put on.