This year’s Open House London takes place Saturday September 14 to Sunday September 22. Open House London is an annual festival dedicated to making the capital’s architectural spaces accessible to all. It allows entry to private homes, government buildings and historic sites that are normally closed to the public. Some of the buildings offer free tours, others are simply open to walk-in visitors, although entry to very famous sites like 10 Downing Street and New Scotland Yard are allocated via a ballot. It’s the largest event of its kind in the world and features walks, talks and tours.
The festival programme is available to view here https://programme.openhouse.org.uk/calendar. It goes live for bookings on 21 August at midday.