While focused inwards on a shared courtyard, the architecture of this small development in Southwark also improves the boundary conditions, both onto the local high street and towards the rear neighbours. The gap site is currently the ‘missing tooth’ in a curved terrace of shops to Tower Bridge Road. Our design, which will be built by others following the sale of the site, reintroduces the local typology of back yards accessed through tunnel alleyways that punch through the street frontage.