With the objectives of following best practice in terms of sustainable development and to achieve a high degree of prefabrication, a high-density urban development with 65 housing units was constructed using a steel system of a large, light gauge steel panels for floors and walls, three-dimensional modules for the bathrooms, and hot rolled steel for balconies and other visible components. The external walls have high levels of thermal insulation, whilst internal walls and floors provide excellent sound insulation. Issues of disproportionate collapse were addressed by following the guidance given by the Steel Construction Institute Publication P301. The six-storey block utilised 400 different types of panels, the use of large numbers of nonstandard panels being made possible by the use of computer aided design. 5 refs.