We celebrated our birthday last week, raising our glasses to three years of giving guests a glimpse into some of the most distinctive private homes in London – and now New York too. But there’s an organisation we rather like who’re doing something similar (albeit for one weekend a year only) – and they’re celebrating an even bigger anniversary.

This weekend Open House takes hold of London for the 20th year running, throwing open the doors of over 750 buildings and spaces to the public. It’s a city-wide (and completely free) celebration of architecture and design, and includes a programme of neighbourhood walks, tours, night-time openings, and even jogs. Though the programme includes many an iconic landmark, what we particularly like about it is the fact that it includes over 100 private homes. Here are the ones we’ll be visiting:

This Victorian studio-house originally built for illustrator Kate Greenaway, because it has been constructed to catch as much light as possible.

68 Dean Street, because we’re enamoured with the Georgian architecture we’ve seen at the likes of Fournier Street.

This eccentric modern concrete and glass brick house in Hampstead, because it drew this acclaim from Edwin Heathcote: ‘This is a building that pinpoints a moment in which Britain was at the forefront of a rethinking of the aesthetics and meaning of Modernism. A singular work of an incredibly fertile mind. Each room is deceptively complex. The house is an extraordinary personal statement of intent.’

This timber-framed home in East London, because there’s nothing quite as charming as a wooden house.