Open House London

Open House London, now known as Open House Festival, is an annual festival celebrating the architecture and urban landscape of London. It is staged by the charity Open City which campaigns to make London a more accessible, equitable and open city. Starting in London in 1992 the festival has spread to over 60 of cities across the world. During the Open House Festival, many buildings considered to be of architectural significance open their doors for free public tours.

The 2019 event featured over 800 buildings, neighbourhood walks, architects' talks, cycle tours, and more. Well-known buildings not usually open to the public which were open on Open House weekend in 2005, for example, included Marlborough House, Lancaster House, Mansion House, the Foreign and Commonwealth Office, and Horse Guards.

Outside of the Open House festival, Open City organises other projects including year-round tours, lectures and educational events for children and young people.

The Open House Key
The Open House festival uses a key as its emblem, the blade formed in the shape of London's skyline.