The reinvention of old residential buildings into a new high-density, upmarket housing/studio type has resulted in a prototype solution with a core element, adaptable to suit different floor shapes. The core takes care of the inhabitants' practical and service needs: sleeping, cooking, washing, storage and entry, and provides a counterpoint to existing architecture. The lofted bed requires a minimum height of 3.1m. Modern materials and details were used for cost efficiency and easy maintenance, and to appeal to young, single users. A control budget of £25,000 was met at a site in West London. The developer and builder was Brybuild and the engineer was Elliot Wood Partnership. Nine other cores have been inserted in the building.