The Open House London buildings you’ll need to book in advance

The annual architecture fest that is Open House London takes place in September, with over 700 venues to visit and tours to join.
The coveted lift pass (c) ianVisits
Most are turn-up-and-walk-in, but some need to be booked in advance, and that opens at midday on Wednesday 19th August 2026. I’ve waded through the circa 700 venues to find the ones that need to be booked in advance – which was “fun”, as there isn’t a needs booking filter on the organiser’s websit