Open House London 2013 is the 21st edition of this popular event, now a staple in the capital’s architectural calendar. Every year the scheme encourages some 750 top design destinations around the city to open their doors to an inquisitive public. The combination of rarely seen public buildings, brand new private houses, historic treasures and architectural oddities is dizzying, with something for every taste. Open House functions as both a way of tempting people into unseen art collections or for architects to showcase their own design talents (and happy clients). As before, we’ve trawled the lists and come up with a selection of new buildings to scope out on this weekend (21 – 22 September).