London has a hugely varied range of building typologies, from low rise terraces to Edwardian mansion blocks, to more modern office buildings and high-rise blocks of flats. All of these typologies have potential for adding storeys, with different boroughs presenting different scales of opportunities. 


An assessment was made based on the available information on parameters for urban density, for each borough, to assess opportunities for adding flats to those over 3 floors, resulting in a potential for over 515,000 units to be delivered across London.