Question: when were the houses of parliament in london built
Answer: 12472 Area 112,476 m ( 1,210,680 sq ft ) ( internal ) Built 1016 Demolished 1834 ( due to fire ) Rebuilt 1840 -- 76 Architectural style ( s ) Perpendicular Gothic Revival Owner Queen Elizabeth II in right of the Crown UNESCO World Heritage Site Official name : Palace of Westminster , Westminster Abbey , and St Margaret 's Church Type Cultural Criteria i , ii , iv Designated 1987 ( 11th session ) Reference no .