House up for auction for 17k - but it doesn't have a roof

House up for auction for £17k - but it doesn't have a roof Slide 1 of 5, An aerial photo of a ruins of a roofless stone building surrounded by dense woodland and ferns. With property prices soaring in recent years, the idea of buying your own home for £17,000 might seem like a dream come true. But there's a catch - it doesn't have a roof. The ruined shell of 400-year-old Ty Du near Llanberis, Gwynedd, lies in the wooded foothills of Wales' highest mountain, Yr Wyddfa, also know as Snowdon . It dates from the 13th Century, and once belonged to the Goodman family of Ruthin.