There is an unmistakable magic to London in mid-September. The summer holiday is over and crowds begin to dissipate. The parks take on a golden hue and as the rain makes an appearance they get their colour back, and for nine glorious days, the capital flings open its doors to reveal its architectural treasures. Private homes, historical gems and buildings that are not usually open to the public welcome the curious explorer and reveal their hidden secrets.
Running from Saturday 12th to Sunday 20th September 2026, the Open House Festival celebrates the buildings, places, and neighbourhoods that make London one of the world’s most dynamic cities. Whether you are an architecture aficionado, a neighbourhood explorer, or simply someone who loves peeking past a grand doorway, this year’s festival promises an extraordinary journey through London’s built environment.
What is Open House Festival?
Organised by the charity Open City, the festival is a city-wide celebration of its rich architectural diversity and local heritage. Driven by the belief that great design and heritage should be accessible to everyone, not just for experts, the festival transforms all 33 London boroughs into a vast, open-air gallery. And the best part, across the nine days, hundreds of sites open their doors completely free of charge.
From sprawling civic landmarks and ultra-modern sustainable eco-homes to historic livery halls, secret rooftop gardens, and repurposed industrial spaces, the festival celebrates every facet of urban living.
What makes Open House truly special, however, is not just the physical structures but the stories behind them with many of the tours led by architects, community volunteers, local historians, and residents who live, work, and breathe these spaces every day.
Highlights to watch for in 2026
While the full festival guide features hundreds of participating locations across the capital, a few key themes stand out for this year’s edition:
- Pioneering green design & retrofits: As London strives towards net-zero goals, this year’s programme places a strong spotlight on sustainable architecture. Expect guided tours of award-winning passive houses, clever residential retrofits, and innovative timber-framed structures demonstrating how modern design can harmonize with ecological responsibility.
- Historic gems & hidden sanctuary spaces: From private garden squares in Central London to centuries-old churches, subterranean chambers, and grand civic interiors, visitors get rare, privileged access to spaces normally off-limits to the public.
- Community-led urban spaces: Beyond grand architecture, Open House celebrates grassroots urbanism. Keep an eye out for tours of local community hubs, pocket parks, co-housing projects, and creative workspaces that reflect the vibrant diversity of London’s distinct neighbourhoods.
- Walking tours & curated trails: If you prefer to stay outdoors, the festival offers an expansive lineup of guided walking and cycling tours. Led by local experts, these trails explore everything from brutalist housing estates to post-war industrial heritage along the Thames.
How to make the most of your festival experience
With hundreds of events spread across the city, a little preparation goes a long way:
- Explore the programme online: Visit the official website to browse the full lineup. You can filter events by borough, architectural style, accessibility, and date.
- Check booking requirements: While many locations operate on a simple drop-in basis—where you can simply queue up and enter—popular private residences, heritage towers, and guided walking tours require advance ballot entries or free ticket bookings.
- Plan your borough days: To avoid spending your weekend traversing the Tube network, group your visits geographically. Pick two or three sites within walking distance in a single borough—such as Greenwich, Southwark, or Hackney—and discover local cafes and parks along the way.
- Download the festival app: Keep live updates, interactive maps, and queue times at your fingertips while on the go.
Essential details for Open House Festival this year
When: Saturday 12th – Sunday 20th September 2026
Where: Locations across all 33 London boroughs
Cost: Free admission to all participating sites
Full Programme & Bookings: on the Open House Festival website.
Whether you choose to climb a bell tower, step inside an award-winning modern residence, or explore a hidden community orchard, Open House Festival 2026 offers a unique opportunity to fall in love with London all over again. Mark your diaries, grab your walking shoes, and prepare to discover the city from the inside out!
Full event listings, tickets, and interactive trail maps, are available on the festival website. For more ideas of things to do, visit our events and activities area which provides details of free events and special offers in London’s finest venues and lots more. Follow us on Instagram for latest London restaurant reviews and thigs to do in London ideas.