Open City is a charity brand dedicated to creating open, accessible, and equitable architecture and neighborhoods. Their mission is to empower communities by providing opportunities to learn, experience, and shape the places where they live. Open City collaborates with diverse communities, working towards widening access to spaces, built heritage, neighborhoods, knowledge, and careers that are often excluded.

Their work is organized into five strands. The Open House Festival, their signature event, engages tens of thousands of visitors annually, allowing them to explore new places, learn about different communities, and experience diverse architecture firsthand. They also work with schools and higher education providers to support children and young people from underrepresented communities, developing design skills and critical thinking for future careers in creative industries.

Open City also offers a year-round program of events, tours, training courses, publications, podcasts, and new media programs centered on exploring built heritage and architecture. They lead and support an international network of over 50 Open House Festivals, engaging citizens from around the world with their local communities' architecture. Additionally, they foster collaboration between culture, heritage, and architectural charities to amplify their social impact.

Overall, Open City is committed to promoting inclusivity, education, and engagement within the field of architecture and the communities it serves