Watch Grand Designs season 3 episode 4 online. Philip and Angela Traill set out to convert a 150-year-old barn near Surrey. The barn is grade two listed which means they have to keep the outside intact but are free to do what they please on the inside. They didn’t want to do another typical barn conversion, so they decided to build their “house” inside instead. A helical stairway leads to a suspended curved walkway, with master bedroom on one side and the children bedrooms on the other. The kitchen is in an adjacent stable block, which was integrated into the main building. The house is also packed with computer wiring a central stereo system and ambient lighting system consisting of 188 lights. Everywhere you look curves interplay with straight lines. The result is a beautiful mixture of new and old, exquisitely finished in detail.