Open House London returns for its 35th edition from 12 to 20 September 2026, and for nine days the city’s architecture belongs to everyone. Organised by Open City, the festival gives Londoners and visitors free access to buildings that are normally closed, from private homes and working offices to civic landmarks, infrastructure projects, and community spaces spread across all 33 boroughs.
With more than 800 buildings opening their doors, the scale is hard to match anywhere. Alongside the open days, the programme includes guided walking tours, cycle routes, talks, and neighbourhood trails exploring everything from Georgian terraces to contemporary social housing. Families are also well catered for, with art and architecture activities across the city aimed at children aged three to thirteen.
The big-ticket draws require a ballot. In previous editions these have included 10 Downing Street, the BT Tower’s revolving floor 158 metres above the capital, BBC Broadcasting House, Canada House, and the London Museum. The 2026 ballot buildings will be confirmed when the full programme is published on 15 July. Register for a free account at open-city.org.uk to be eligible, and note that bookings for ticketed activities open at midday on 19 August.
Most venues operate on a first-come, first-served basis, so popular spots reward an early start. Keep an eye on the official Open House social channels on the day for live queue updates. Entry throughout is free.
Getting there depends entirely on where you’re headed, but London’s Tube, Overground, and bus network covers every borough. Grab an Oyster card or use contactless, and plan a loose route borough by borough rather than criss-crossing the city.
