Summary: The redevelopment of the University of Ulster’s Belfast campus building to provide state-of-the-art facilities for 2,000 art and design students had to be undertaken without disrupting university activities. Todd Architects’ approach was to extend the existing 1960s concrete framed building upwards and outwards, providing space for the students to be vacated from the top two floors of the old building, and enabling a new roof and cladding to wrap over the existing building, which was subsequently dismantled from within. Environmental measures include using exposed concrete slabs as a heat store, installing heat and CO2 sensors in every room to ensure the right levels of fresh air and heating, and reclaiming heat at the top of the first atrium. The final energy benefit to the retrofitted building was 64 percent over the original building.